Att_01c_STLI_201065_Main_Mall-Specs.pdf

National Park Service U.S. Department of the Interior Denver Service Center

Statue of Liberty National Monument

STLI 201065

Repair Storm Damage to Statue Mall and Plaza – Main Mall Pavers and Tree Panels Final Construction Documents January 2016

Specifications

Task Order Number P15PD00400 NPS IDIQ Contract Number P15PC00019 Design Services for Design Development and Construction Documents

STLI 201065 TOC-1

TABLE OF CONTENTS

DIVISION 02 – EXISTING CONDITIONS

02 04 13 Selective Demolition

DIVISION 03 – CONCRETE

03 30 00 Cast-in-Place Concrete

DIVISION 04 – MASONRY

04 46 51 Cleaning Exterior Granite 04 46 52 Re-Setting Loose Granite

DIVISION 31 – EARTHWORK

31 10 00 Site Clearing 31 20 00 Earth Moving

DIVISION 32 – EXTERIOR IMPROVEMENTS

32 05 33 Landscape Establishment 32 14 16 Brick Unit Paving 32 84 00 Planting Irrigation 32 91 13 Custom Structural Soil 32 91 19 Planting Soil 32 93 00 Exterior Plants

DIVISION 33 – UTILITIES

33 05 00 Common Work Results for Utilities 33 11 00 Water Distribution 33 41 00 Storm Utility Drainage Piping

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SELECTIVE DEMOLITION

SECTION 02 41 13 - SELECTIVE DEMOLITION

PART 1 - GENERAL

1.1 GENERAL PROVISIONS

A. Attention is directed to the CONTRACT AND GENERAL CONDITIONS and all Sections within DIVISION 01 - GENERAL REQUIREMENTS which are hereby made a part of this Section of the Specifications.

1.2 DESCRIPTION OF WORK

A. The work under this section shall consist of providing all work, materials, labor, equipment, and supervision necessary to provide for the demolition of site work and such features as required in these specifications and on the drawings.

B. Related Work: The following items are not included in this Section and are specified under the designated Sections:

1. Section 015000 – Temporary Facilities

2. Section 015639 – Temporary Tree and Plant Protections

3. Section 311000 – Site Clearing

1.3 SUBMITTALS

A. For utilities or other services requiring removal or abandonment in-place, submit materials documenting completion of such work.

B. Submit record drawings.

C. Submit copies of records documenting recycling or disposal of demolition materials from the site.

D. Schedule of Selective Demolition Activities indicating the following:

1. Detailed sequence of selective demolition and removal work, with starting and ending dates for each activity. Ensure on-site operations are uninterrupted.

2. Interruption of utility services. Indicate how long utility services will be interrupted.

3. Coordination for shutoff, capping, and continuation of utility services.

1.4 RECORD DRAWINGS

A. Maintain record drawings showing actual locations of utilities and other features encountered, and any deviations from the original design. Show actual limits of removal and demolition.

1.5 SAFETY

A. Verify that all gas and electrical utilities have been abandoned or disconnected and associated hazards mitigated, prior to beginning any demolition.

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B. Take all necessary precautions while dismantling piping containing gas, gasoline, oil or other explosive or toxic fluids or gases. Purge lines and contain materials in accordance with all applicable regulations. Store such piping outdoors until fumes are removed.

C. Maintain a clean and orderly site. Remove debris at end of each workday.

D. Burning of debris is not permitted.

E. If hazardous materials are not anticipated, but encountered, terminate operations and contact the Owner and Engineer immediately. Follow all applicable local, state and federal regulations pertaining to hazardous materials.

1.6 PERMITS

A. Unless otherwise noted in the Contract Documents, Contractor shall be responsible for obtaining and paying for all permits necessary to complete the work.

1.7 FIELD CONDITIONS

A. Conduct selective demolition so Government operations will not be disrupted.

B. Notify the Contracting Officer of discrepancies between existing conditions and Drawings before proceeding with selective demolition.

C. Maintain fire-protection facilities in service during selective demolition operations.

1.8 DISCONNECTION OF SERVICES

A. Prior to starting removal and/or demolition operations be responsible and coordinate disconnection of all existing utilities, communication systems, alarm systems and other services.

B. Disconnect all services in manner which insures continued operation in facilities not scheduled for demolition.

C. Disconnect all services in manner which allows for future connection to that service.

D. Disconnect services to equipment at unions, flanges, valves, or fittings wherever possible.

1.9 REMOVAL/SALVAGING OF ITEMS

A. Carefully remove all items that are scheduled to be salvaged.

B. Secure salvaged items to allow for future movement; provide pallets, skids and other devices as necessary. Secure all loose parts.

C. Provide crates, padding, tarps and other measures necessary to protect salvaged items during storage. Store items in secure location, safe from vandalism, weather, dust and other adverse elements.

D. Where salvaged items are indicated to be turned over to Government, deliver to location on property where designated by Contracting Officer.

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E. Where indicated to be incorporated into new work, store the salvaged item in secure location until trade responsible for re-installation mobilizes his equipment and storage facilities to the site, or otherwise accepts responsibility for the salvaged item.

1.10 OWNER-SALVAGED OR REMOVED MATERIALS

A. Unless otherwise indicated, demolition waste becomes property of Contractor.

B. Storage or sale of removed items or materials on-site is not permitted.

PART 2 - MATERIALS

2.1 EQUIPMENT

A. Use Contractor's normal equipment for demolition purposes and which meets all safety requirements imposed on such equipment.

B. Demolition and hauling equipment and other materials shall be of sizes that clear surfaces within historic spaces, areas, rooms, and openings, including temporary protection, by 12 inches or more.

C. Use diamond blades for sawing concrete where a full-depth cut is required. The contractor may use carbide cutting wheels to saw concrete that will be overlaid or for full-depth cuts where the cut face does not join the new concrete.

2.2 PERFORMANCE REQUIREMENTS

A. Comply with governing EPA notification regulations before beginning selective demolition.

Comply with hauling and disposal regulations of authorities having jurisdiction.

B. Comply with ANSI/ASSE A10.6 and NFPA 241.

2.3 MATERIALS OWNERSHIP

A. Unless otherwise indicated, demolition waste becomes property of Contractor.

B. Historic items, relics, antiques, and similar objects including, but not limited to, cornerstones and their contents, commemorative plaques and tablets, and other items of interest or value to the Government that may be uncovered during demolition remain the property of the Government.

1. Carefully salvage in a manner to prevent damage and promptly return to Contracting

Officer.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Verify that utilities have been disconnected and capped before starting selective demolition operations.

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B. Review record documents of existing construction. The Government does not guarantee that existing conditions are same as those indicated in record documents.

C. Survey existing conditions and correlate with requirements indicated to determine extent of selective demolition required.

D. When unanticipated mechanical, electrical, or structural elements that conflict with intended function or design are encountered, investigate and measure the nature and extent of conflict.

Promptly submit a written report to Contracting Officer.

3.2 PREPARATION

A. Conduct selective demolition and debris-removal operations to ensure minimum interference with roads, streets, walks, walkways, and other adjacent occupied and used facilities.

B. Provide temporary barricades and other protection required to prevent injury to people and damage to adjacent buildings and facilities to remain.

1. Provide protection to ensure safe passage of people around selective demolition area and to and from occupied portions of site.

2. Protect walls, ceilings, floors, and other existing finish work that are to remain or that are exposed during selective demolition operations.

3. Comply with requirements for temporary enclosures, dust control, heating, and cooling specified in Section 015000, Temporary Facilities and Controls.

C. Temporary Shoring: Provide and maintain shoring, bracing, and structural supports as required to preserve stability and prevent movement, settlement, or collapse of construction and finishes to remain, and to prevent unexpected or uncontrolled movement or collapse of construction being demolished.

1. Strengthen or add new supports when required during progress of selective demolition.

3.3 PROTECTION OF EXISTING WORK AND FACILITIES

A. Take all measures necessary to safeguard all existing work and facilities which are outside the limits of the work.

B. Furnish and install fencing or other barriers as shown on the plans or as otherwise necessary to protect existing features.

C. Verify the locations of, and protect, any buildings, structures, utilities, paved surfaces, signs, streetlights, utilities, landscaping and all other such facilities that are intended to remain or be salvaged.

D. Make such explorations and probes as necessary to ascertain any required protection measures that shall be used before proceeding with demolition.

E. Provide and maintain adequate catch platforms, warning lights, barricades, guards, weather protection, dust protection, fences, planking, bracing, shoring, piling, signs, and other items required for proper protection.

F. Provide protection for workmen, public, adjacent construction and occupants of existing building(s).

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G. Report damage of any facilities or items scheduled for salvaging to the Owner’s Representative.

H. Repair or replace any damaged facilities that are not scheduled for demolition.

I. Explosives shall not be used for demolition.

J. Keep streets, walks and all other adjacent paved areas clean and swept clear of dirt, mud and debris deposited as a result of this operation.

K. Protect surrounding area from dust. Control rodents, and other vermin associated with demolition operations.

3.4 DEMOLITION

A. Remove all equipment, fixtures and other materials scheduled for salvage prior to beginning demolition operations.

B. Demolish and remove all buildings and structures scheduled for demolition as shown on the plans.

C. Abandon gas, electric and communication utilities in accordance with local utility company requirements, or applicable substantive requirements if considered private.

D. Carry out vehicle loading as necessary within the project boundaries or as defined or indicated on the drawings, but not in locations that block vehicular traffic on the streets or pedestrian traffic on adjacent public walks.

E. Dismantle each structure in an orderly manner to provide complete stability of the structure at all times. Provide bracing and shoring where necessary to avoid premature collapse of structure.

F. Conduct demolition operations and the removal of rubbish and debris in such a way that a minimum of nuisance dust is caused. Constantly sprinkle rubbish and debris with water if necessary to keep nuisance dust to a minimum.

G. Where necessary to prevent collapse of any construction, install temporary shores, underpinning, struts or bracing. Do not commence demolition work until all temporary construction is complete.

H. During the execution of the work, provide, operate, and maintain all pumping equipment, suction and discharge lines in a number of capacity as required to keep all cellars and pits free of water from any source whatsoever at all times.

I. Masonry and concrete shall be demolished in small sections. Use braces and shores as necessary to support the structure of the building or structure and protect it from damage.

Where limits of demolition are exposed in the finished work, cutting shall be made with saws, providing an absolutely straight line, plumb, true and square.

J. Operate equipment so as to cause a minimum of damage to plaster which is to remain, and so as to keep dust and dirt to a minimum.

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3.5 SITE DEMOLITION

A. Neatly saw or cut joints at the limits of removal; whenever possible, locate cuts at existing joints.

B. Cut existing plaster with power saws equipped with plaster cutting blades and dust collection system.

C. Patch or repair any damaged surfaces or structural members at the limits of removal.

D. Remove structural framing members and lower to ground by hoists, derricks or other suitable means.

E. Break up and remove concrete slabs-on-grade, unless otherwise shown to remain.

3.6 DEMOLITION BELOW GRADE

A. Demolish foundation walls and other below grade features in accordance with the plans. Unless otherwise noted, remove all below grade features to a point 4 feet below adjoining existing grade, or proposed grade, whichever is lower. Basement and/or lowest level floors more than 4 feet below existing grade need not be removed, but must be broken up to permit drainage.

3.7 WORK IN HISTORIC AREAS

A. Selective demolition may be performed only in areas of the Project that are not designated as historic. In historic spaces, areas, and rooms or on historic surfaces, the terms "demolish" or "remove" shall mean historic "removal" or "dismantling".

3.8 SAWING ASPHALT

A. Make straight saw cuts at least 2 inches deep. Saw so the surface remaining is generally vertical over its full depth. Saw to the depth the plan indicates or as the Contracting Officer directs or allows.

3.9 SAWING CONCRETE

A. Do not extend saw cuts into newly placed concrete pavement or into existing pavements more than 12 inches beyond the limits the Contracting Officer designates. Saw full-depth unless the plans indicate otherwise or the Engineer directs or allows otherwise.

B. Remove sawing sludge after completing each saw cut. Minimize sludge on live traffic lanes.

Remove sludge from all traffic control devices each day before dark. Dispose of sludge at an acceptable material disposal site or on Contracting Officer-approved areas of the roadway or roadside.

3.10 TRANSPORTATION AND DISPOSAL OF DEMOLITION WASTE

A. Transport and dispose all demolition waste in accordance with local, state, and federal guidelines.

B. Whenever possible, or otherwise required by the Contract Documents, recycle demolition waste.

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C. Demolition waste shall be disposed of at a landfill or dumpsite designed and approved to accept the given waste.

D. Maintain records documenting recycling and disposal of demolition waste. Record description of material, date removed, quantity removed, method of transport and recycling/disposal destination.

3.11 CLEANING

A. Clean adjacent structures and improvements of dust, dirt, and debris caused by selective demolition operations. Return adjacent areas to condition existing before selective demolition operations began.

END OF SECTION

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CAST-IN-PLACE CONCRETE

SECTION 03 30 00 – CAST-IN-PLACE CONCRETE

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. The BIDDING REQUIREMENTS, CONTRACT FORMS, and CONDITIONS OF THE CONTRACT and applicable parts of DIVISION 1 - GENERAL REQUIREMENTS, as listed in the Table of Contents, shall be included in and made a part of this Section.

1.2 WORK INCLUDED

A. Labor, materials, equipment, services and transportation required to complete cast-in-place concrete work shown on Drawings, as specified herein, or both, including but not limited to items noted below.

1. Furnishing, placing, curing, finishing, and protection of all reinforced cast-in-place concrete above and below grade.

2. Furnishing and placing of reinforcing steel and related positioning and securing accessories, including epoxy coating where specified.

3. Furnishing and installation of admixtures, inserts for connections, waterstops, flashing reglets, and similar items in conjunction with concrete work.

4. Furnishing and installation of non-shrink grout at locations shown on the drawings.

5. Installation of items furnished by other sections (such as anchors, sleeves, bolts, pipes, and plates), and required to be cast into concrete.

6. Make provisions in forms for proper location and installation of pipe sleeves, duct openings, keys, chases, electrical boxes, bolts, anchors, inserts, and similar items, as required by other trades. Notify appropriate trades when items noted are ready for installation.

7. Unless specifically excluded, furnishing and installation of any other items of cast-in-place concrete work indicated on drawings, specified, or obviously needed to make work of this Section complete.

8. Providing sources of testing laboratory to design concrete mixes. All testing fees shall be paid by the Contractor.

9. Finishing, saw cutting and concrete repairs.

10. Curing concrete.

11. Cleaning concrete.

1.3 RELATED WORK SPECIFIED ELSEWHERE

A. Examine Contract Documents for requirements that affect work of this Section. Other Specification Sections that directly relate to work of this Section include, but are not limited to:

1. Division 31 - Earthwork

2. Division 05 - Metals

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1.4 REFERENCES

A. Except as otherwise specified herein, perform work in accordance with specifications noted below, including latest editions of applicable specifications, codes, and standards cited therein, and latest applicable addenda and supplements. Keep copies of these items available in shop and field.

1. "The International Building Code", 2012 edition.

2. “New York City Building Code”, 2014 edition.

3. "Building Code Requirements for Reinforced Concrete" (ACI 318-11), American Concrete Institute.

4. "Specifications for Structural Concrete for Buildings" (ACI 301-10), Sections 1 through 6, American Concrete Institute.

5. “Manual of Standard Practice for Detailing Reinforced Concrete”, (ACI 315).

6. "Structural Welding Code - Reinforcing Steel" (AWS D1.4-98), American Welding Society.

7. "Manual of Concrete Practice", (ACI), Volumes 1 through 5, Standards and Recommended Practices referred to in this Section.

8. American Society for Testing and Materials (ASTM) Standards referenced in this Section.

B. Any material or operation specified by reference to published specifications of manufacturer or published standard shall comply with said specification or standard. In case of conflict between referenced specifications, most stringent requirement shall govern. In case of conflict between referenced specifications and Project Specifications, Project Specifications shall govern.

1.5 SUBSTITUTIONS

A. Substitutions for member sizes, type(s) of concrete, details or any other modifications proposed by Contractor will be considered by the Contracting Officer (CO) only under following conditions:

1. That request has been made and accepted prior to submission of Shop Drawings.

2. That there is a substantial cost advantage or time advantage to Owner; or that proposed revision is necessary to obtain required materials or methods at proper times to accomplish work in time scheduled.

3. That sufficient sketches, engineering calculations, and other data have been submitted to facilitate checking by CO, including cost reductions or savings in time to complete work.

1.6 SUBMITTALS

A. Concrete Constituents:

1. Submit to CO a detailed list of concrete materials, and corresponding sources, proposed for use in concrete for this project.

2. See Section 2.2 below for submittal of strength information related to mix design.

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3. If conveying concrete by pump is intended, submit related data regarding concrete materials, pumping device, and methods to CO. Demonstrate understanding of slump loss considering normal weight concrete and use of High Range Water Reducer.

4. Testing fees for approval of concrete mixtures shall be paid for by Contractor.

B. Methods of Construction: Submit to CO, prior to starting work, description of methods, sequence of construction, and type of equipment proposed for use for performing cast-in-place concrete work.

C. CO’s review is only for the effects of methods on permanent structure. This submission shall not relieve Contractor of his responsibility for providing structural design for methods and equipment, and the necessary methods, equipment, workmanship, and safety precautions.

D. Concrete Mix Design Data: Not less than four weeks prior to beginning the work, submit concrete mix design data for each proposed mix to the CO for review and approval. Mix designs shall be calculated and certified by the testing laboratory, and shall indicate the weight of each ingredient of the mixture, aggregate gradation, slump, air content, water-cement ratio and 7-day and 28-day compressive strength test results. Include a complete list of materials, including admixtures and applicable reference specifications. Include statements from concrete supplier(s) that the mix designs will achieve the specified concrete quality as noted in Sections 2.2.

E. Shop Drawings: Submit to CO detailed Shop Drawings, including erection drawings and schedules.

1. Reinforcement Drawings: prepare in accordance with ACI SP-66 Detailing Manual and ACI 315 “Manual of Standard Practice for Detailing Reinforced Concrete” and show following: elevations; dimensions of concrete work with specified reinforcement clearances; special reinforcement required for openings in concrete structures; ledges, brackets, openings, sleeves or other items furnished by other Sections, where interference with reinforcement may occur; bending diagrams; assembly diagrams; splices and laps of reinforcement; temperature and shrinkage reinforcement; construction joint reinforcement; and shapes, dimensions, grade designations, and details of reinforcement and accessories. Show dowels with concrete work to be placed first. Shop drawings shall be prepared, signed, and sealed by a licensed Professional Engineer.

2. CO’s checking is only a review for conformance with the design concept of the project and compliance with the information given in the contract documents. The Contractor is responsible for: confirming and correlating all quantities and dimensions; selecting fabrication processes and techniques of construction; coordinating this work with that of all other trades; and performing the work in a safe and satisfactory manner.

3. Do not proceed with fabrication of material or performance of work until corresponding item on Shop Drawing has been reviewed by the CO.

F. Samples: Submit to CO samples and/or descriptive literature of materials, products, and methods as noted herein, and as otherwise requested by CO: concrete constituents including admixtures; form ties and spreaders; accessories for reinforcement; reglets; non-shrink cement grout; inserts; form release agents, and waterstops.

1. Do not proceed with fabrication of material/product or performance of work until Sample has been approved by CO.

G. Concrete Curing and Protection: Submit to CO detailed methods proposed for curing and protecting concrete in normal, cold and hot conditions.

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H. Mill Test Certification: Submit to CO prior to delivery of reinforcing steel or concrete to job site, certified mill test reports of reinforcing steel and cement, (including names and locations of mills and shops, and analyses of chemical and physical properties), properly correlated to concrete to be used in this project. This submittal is for information and file record.

I. Certificates of Compliance: Submit manufacturer’s certificates of compliance for the following materials showing that the named material conforms to the requirements of the Contract Documents. The manufacturer’s certifications shall name the appropriate materials, the publication or publications specified as controlling the quality of that item, and shall state that the item conforms to the requirements specified. Certificates shall be printed on the manufacturer’s letterhead and shall be signed by the manufacturer’s official authorized to sign certificate of compliance, and having legal authority to bind the manufacturer. Furnishing certificates of compliance shall not provide relief of responsibility for providing materials that conform to the requirements of the Contract Documents.

1. Aggregates.

2. Admixtures.

3. Reinforcement, including epoxy coating certification.

4. Cement.

J. Corrective Work: Submit to CO drawings showing details of any proposed corrective work prior to performing corrective work.

K. Affidavit: Submit to CO, on request by CO, manufacturer's and/or supplier's and/or installer's affidavit stating that material or product provided complies with Contract Documents.

L. Plans for Job Mock-Ups: Prior to construction of field-constructed job mock-up, submit com-plete and accurate plans and shop drawings showing the details to be used for construction of the job mock-ups. These plans and shop drawings shall be in addition to all other shop draw-ings required to be submitted for the work. Such plans shall show in detail all dimensions, kind, type, and quality of all materials, applicable specification references, and such other information as is usual and customary to provide a clear and comprehensive description of the job mock-up construction contemplated. Plans for the job mock-ups shall be approved by the CO before any job mock-up work is performed. Mock-Up shall consist of three (3) barrier support posts, including two (2) anchor posts at each and one (1) intermediate post in the middle. Posts shall be spaced at 6’-0” on center. Mock-up shall include all components of the structure, including foundations, railings, wire mesh, connections, hardware, expected finishes, etc.

M. Job Mock-Ups: After acceptance of material samples, construct each mock-up item above at the Project Site for review and acceptance by the CO. Section shall show color, finish, workmanship, quality of materials, execution, appearance, and aesthetic effects and shall include representative details similar to those required and indicated. Build mock-ups to comply with the following requirements, using materials proposed for final units of work. Cast, finish, cure, and construct mock-up in same manner as will be employed in production work.

Have all material on hand and in place for casting, mixing, forming, finishing, and curing the job mock-up. Job mock-up shall be completely cast, constructed, finished, and cured at least thirty days prior to any production cast-in-place concrete work at the site. Mock-ups shall be produced by the individual workers who will perform the work for the project. Retain samples of cement, sand, and aggregate used in the mock-up for comparison with materials used in the remaining work. In addition, schedule sufficient time for review of results, correction of deficiencies, reconstruction, and acceptance to prevent delay in the progress of the work.

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Extensions of Contract Time, additional costs, or other concessions will not be allowed due to delays or expenses caused by or in any way related to job mock-up construction and evaluation.

Scope of job mock-ups will be determined for future submission. Protect and maintain mock-ups throughout construction period.

1.7 DELIVERY, STORAGE, AND HANDLING

A. Deliver packaged materials to Project Site in original unopened and undamaged containers plainly labeled with manufacturer’s name, product name and designation, expiration period for use, mixing instructions for multicomponent materials, and other pertinent data. Store and handle materials to prevent their deterioration or damage due to moisture, temperature changes, contaminants, corrosion, breakage, and other causes.

B. Product handling shall comply with the applicable requirements of ACI 301, Chapter 2, Paragraph 25. Reinforcing bars and accessories shall be stored above the ground on platforms, skids, or other supports. Other materials shall be stored in such a manner as to avoid contamination and deterioration.

C. Damaged or non-conforming materials shall be removed from the Project site and replaced with new materials satisfactory to the CO at no additional cost to the Client.

1.8 ENVIRONMENTAL CONDITIONS

A. Cold Weather Placing: Protect concrete work from physical damage or reduced strength which could be caused by frost, freezing actions, or low temperatures, in compliance with ACI 306 and as herein specified.

1. When air temperature has fallen to or is expected to fall below 40 degrees F., uniformly heat water and aggregates before mixing to obtain a concrete mixture temperature of not less than 50 degrees F., and not more than 80 degrees F., at point of placement.

2. Do not use frozen materials or materials containing ice or snow. Do not place concrete on frozen subgrade or on subgrade containing frozen materials.

3. Do not use calcium chloride, salt and other materials containing antifreeze agents or chemical accelerators, unless otherwise accepted in mix designs.

4. When the ambient temperature is below 40 degrees F or is expected to drop below 40° in the 12 hours after anticipated placement, concrete shall not be placed unless otherwise directed by the CO.

B. Hot weather placing: When hot weather conditions exist that would seriously impair quality and strength of concrete, place concrete in compliance with ACI 305 and as herein specified.

1. Cover reinforcing steel with water-soaked burlap if it becomes too hot, so that steel temperature will not exceed the ambient air temperature immediately before embedment in concrete.

2. Wet forms thoroughly before placing concrete. Cool ingredients before mixing to maintain concrete temperature at time of placement below 90 degrees F. Mixing water may be chilled, or chopped ice may be used to control temperature provided, that when ice is used it shall be added with the water and counted as part of the water-cement ratio.

3. Use water-reducing retarding admixture when required by high temperatures, humidity, or other adverse placing conditions, when acceptable to the CO.

C. Keep permanent temperature record showing date and outside temperature for concreting operations. Take thermometer readings at start of work in morning, at noon, and again late in

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afternoon. Record locations of concrete placed during these periods so any effect temperatures may have had on construction can be correlated. Distribute copies of temperature record daily to CO.

D. Inclement Weather: Under conditions of rain, the placing of concrete shall not commence unless adequate protection is provided to prevent damage to the surface mortar or damaging flow or wash of the concrete surface. During inclement weather conditions concrete shall be provided with adequate protection to prevent damage.

1.9 QUALITY ASSURANCE

A. Pre-Construction Meeting.

1. Adopt a quality control program which will ensure compliance with specified requirements and industry standards. Appoint a person on the construction team to be responsible for quality issues, and prepare a quality control manual which outlines proposed methods for monitoring reinforcing steel placement and concrete placement consolidation and curing.

2. Prior to the start of concrete work, a pre-construction meeting shall be held at which representatives of the Owner, CO and Testing Agency and key personnel of the Contractor and Subcontractor shall be present. Key personnel shall include persons who will supply and mix special admixtures such as HRWR, DCI, silica fume, integral waterproofing; who will place reinforcing and concrete; who will consolidate and cure the concrete. Attendance at the meeting of all parties is mandatory. Discussions at the meeting shall form the basis for the performance and inspection of concrete work.

3. Prior to the start of any item of new work, the specifications and drawings shall be reviewed at a formal meeting at which the Contractor's and Subcontractor's key personnel are present. Key personnel shall include persons actually carrying out the work in the field.

PART 2 - PRODUCTS

2.1 CONCRETE CONSTITUENTS

A. Cement: shall be domestic-made Portland Cement, free from water soluble salts or alkalis which will cause efflorescence on exposed surfaces. Portland Cement shall be Type II or Type IV, conforming to ASTM C150. Do not use air entraining cements. Use only one brand of cement for each type of cement throughout project. No visual variations in color shall result in exposed concrete. Manufacturer shall certify that no alkali reactivity is produced with the proposed combination of concrete materials when tested in accordance with ASTM C227.

B. Fly Ash: ASTM C618, Type C or F; fly ash shall not exceed 25% of cement content by weight.

Blast furnace slag products, if proposed in a concrete mix, shall not exceed 25 percent of the cement content by weight. The combination of these two products, if proposed in a submitted mix design, shall not exceed 25% of the mix cement content by weight.

C. Normal weight Fine Aggregate: shall be washed, inert, natural sand conforming to ASTM C33 and the following additional requirements.

Sieve Retained Percent #4 0 - 5 #16 25 - 40

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Sieve Retained Percent #50 70 - 87 #100 93 - 97 Fineness Modulus 2.80 (Plus/Minus 0.20) Organic Plate 2 maximum Silt 2.0 percent maximum Mortar Strength 100 percent minimum compression ratio Soundness 5 percent max. loss, magnesium sulfate, five cycles

D. Normal weight Coarse Aggregate: shall be well-graded crushed stone or washed gravel conforming to ASTM C33. Coarse aggregate shall also meet the following additional requirements:

Designated Size (inches) 3 2 1-1/2 1 3/4 1/2 3/8

FM (+/-

0.2)

7.95 7.45 7.20 6.95 6.70 6.10 5.50

Organic Plate 1 maximum Silt 1.0 percent maximum Soundness 5 percent maximum loss, magnesium sulfate, five cycles.

1. Maximum designated sizes for normal weight coarse aggregate to be used in concrete sections shall be as noted below, except that sizes shall also be chosen in conjunction with required clearances.

a. One and one-half inches for sections over ten inches in thickness.

b. One inch for sections more than eight and up to ten inches in thickness.

c. Three-quarter inch for sections more than three and up to eight inches in thickness.

E. Water: shall be from approved source, potable, clean and free from oils, acids, alkali, organic matter and other deleterious material.

F. Admixtures:

1. Water-reducing admixture: Shall comply with ANSI/ASTM C494, Type A and contain no more than .05% chloride ions.

2. High-Range Water Reducing (HRWR) admixture (Super Plasticizer): shall comply with ASTM C494, Type F or Type G and contain no more than 0.05% chloride ions:

3. Air entraining admixture shall comply with ASTM C260.

4. Evaporation retarder: *must use water-based monomolecular film; use one of the following with flatwork containing corrosion inhibiter or silica fume admixture:

5. Corrosion Inhibitor admixture: calcium nitrite based inhibitor shall comply with AASHTO M194 Type C, such as W.R. Grace "DCI Corrosion Inhibitor" or approved equivalent at the rate of 3.0 gallons per cubic yard of concrete. Use water-fog misting or evaporation retarder immediately after floating flatwork containing corrosion inhibitor.

* The use of these admixtures in the concrete mix design must include due consideration of other admixtures for color and waterproofing. Admixtures must be included in trial batch mixes of concrete in order to be acceptable for use on the project.

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6. Water-reducing Set Retarders: *shall conform with ASTM C494 Type D and may be used when ambient temperatures exceed 80 degrees F.

7. Accelerator admixture: *Non-chloride and non-corrosive accelerators shall conform to ASTM C494 Type C and may be used when temperatures are below 50 degrees F.

8. Prohibited admixtures: Calcium chloride, thiocynanates and admixtures containing more than .05% chloride ions are not permitted.

2.2 CONCRETE MIXTURES

A. Following ACI 211.1 recommended practice for selecting proportions for normal weight concrete, proportion concrete on the basis of previous field experiences or laboratory trial batches with the materials to be employed in the work. However, mixtures shall have the limiting quantities or values listed below for each strength concrete with coarse aggregate less than 1½ inches.

Compressive Strength at 28 days PSI

Maximum Allowable Net Water Content

Min. Cement Factor

Gallons/sack W/C Ratio

Sack s/Cu.Yd.

Lbs./C u.Yd.

4,000 5.07 0.45 6.38 600

1. Maximum allowable net water content is the total water in the mix at the time of mixing, including free water on aggregate.

2. Consider any fly ash or silica fume as part of the cement content for purposes of establishing cement factor and w/c ratio.

3. Use maximum water-cement equal to 0.45 for concrete subject to freezing and thawing, repeated surface wetting or deicers.

4. Use High-Range Water Reducing admixture for water-cement ratios equal to or less than 0.45.

B. Concrete proportions shall be substantiated by trial mixtures made specifically for this project meeting the following restrictions:

1. Use the combination of materials proposed for use in the work. Include all admixtures required for the concrete as described herein (i.e.: air entrainment, concrete color treatment, integral waterproofing, water reducing agents).

2. Make trial mixtures having proportions and consistencies suitable for the proposed work using at least three different water-cement ratios or, for lightweight concrete, cement contents that will produce a range of strengths encompassing those required for the proposed work.

3. Design trial mixtures to produce a slump within 1 inch of the maximum permitted, and for air-entrained concrete, within 0.5 percent of the maximum allowable air content.

Report the temperature of freshly mixed concrete in the trial mixtures.

4. For each proposed mixture, make and cure at least three compressive test cylinders for each age in accordance with ASTM C192. For normal, heavyweight, and mass concrete, each change of water-cement ratio shall be considered a new mixture. Test the cylinders

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for strength in accordance with ASTM C39 at 28 days or at a specified earlier or later age.

5. From the results of these cylinder tests, plot a curve showing the relationship between compressive strength and the water-cement ratio for normal weight concrete or cement content for lightweight concrete.

6. From this curve, the water-cement ratio for normal concrete to be used in the proposed work, shall be selected to produce an average compressive strength 1200 psi higher than the specified strength. The cement content and mixture proportions to be used shall be such that the selected water-cement ratio or cement content is not exceeded when slump is the maximum permitted. Maintain proper cement content, slump, and air content.

C. Admixtures

1. Use air entrainment admixture in concrete exposed to exterior environment and in accordance with manufacturer's written instructions. Interior protected concrete may be air entrained for improved workability. See ACI 301 Table 3.4.1 for required air content except that minimum for all sizes of aggregate shall be 6 percent in exterior environment.

2. Use water reducing admixture in concrete and in accordance with manufacturer's written recommendations and instructions.

3. Use high-range water reducing (HRWR):

a. In concrete with water-cement ratios equal to or less than 0.45, but do not exceed 8 inches slump.

b. In concrete where anticipated slump losses in transit prevent proper pumping, placing and finishing. Use HRWR instead of adding water at the site. Do not exceed 8 inches slump.

4. Use corrosion inhibitor admixture in concrete that will be exposed to a corrosive environment.

D. Slump shall be in accordance with Part 3 of this Section.

E. Normal weight concrete shall have an air dry weight not exceeding 150 lbs. per cubic foot.

1. Design 28 day strengths as shown in the Drawings. Unless otherwise noted, all concrete shall be 4,000 psi.

F. Any deviation from approved mix design will not be allowed without written approval of CO.

Cost of any additional testing by Testing Agency associated therewith shall be paid for by Contractor.

G. Each proposed mix design must be submitted on separate submittal pages, with each mix clearly labeled with its intended use on the project.

2.3 FORM MATERIALS

A. Concrete Surfaces: Use forms of wood, metal, or other material subject to approval of CO.

B. Form Ties and Spreaders: Use products by Richmond Screw Anchor Co.; Superior Concrete Accessories, Inc.; Dayton Sure-Grip and Shore Co.; or equivalent approved by CO. Wire ties shall not be used. Ties for concrete exposed to view shall be as indicated in Section 033300,

2.1. Ties for foundation walls shall have water seal washers on the earth side.

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C. Form Release Agent: Use a non-staining and non-emulsifiable type. Form release agent shall not impart any stain to concrete nor interfere with adherence of any material to be applied later to concrete surfaces.

2.4 REINFORCEMENT AND ACCESSORIES

A. Reinforcing Steel Bars: shall be newly rolled billet steel conforming to ASTM A615, grade 60.

Bars shall be bent cold. All reinforcing bars, chairs and wire ties shall be epoxy coated;

conforming to ASTM –D3936.

B. Reinforcement Accessories: Reinforcement accessories shall include spacers, chairs, ties, slab bolsters, clips, chair bars, and other devices for properly assembling, placing, spacing, supporting, and fastening reinforcement. Tie wire shall be annealed wire of sufficient strength for intended purpose, but not less than No. 18 gage. Bar supports shall conform to Chapter 3, "Bar Supports" or CRSI Manual of Standard Practice. Supports touching interior formed surfaces exposed to view shall be CRSI Class 1, plastic protected. When epoxy coated reinforcing is used, accessories shall be epoxy coated and tie wire shall be nylon, epoxy or plastic coated

2.5 RELATED MATERIALS

A. Trench drain seating and support.

1. Comply with trench drain manufacturer’s specifications and standards.

B. Non-shrink Grout: Use CRD-C 621, factory pre-mixed grout, Type D, non-metallic, such as one of the following or an approved equivalent:

1. "Masterflow 928"; Master Builders.

2. "Euco-NS"; Euclid Chemical Co.

3. "Five Star Grout"; Five Star Products

C. Absorptive Cover: Use burlap cloth weighing approximately 9 oz. per sq. yd., complying with AASHTO M 182, Class 2.

D. Moisture-retaining Cover: Use one of the following, complying with ANSI/ASTM C 171:

1. Waterproof paper.

2. Polyethylene film.

3. Polyethylene-coated burlap.

E. Curing Compounds: Verify that products listed below meet regulations of jurisdiction for Volatile Organic Compounds (VOC) emissions. Notify CO if listed products do not comply and submit information about equivalent products that do comply.

1. Curing and Sealing Compound: Use a clear acrylic type conforming to ASTM C309, Type I, Class B.

2. Curing and Hardening Compound: Use colorless solution containing 35% of a 42 degree Baume sodium silicate solution. Use where shown on drawings

3. Dissipating Resin Curing Compound: Use a dissipating resin type compound, conforming to ASTM C309, Type I. The film must chemically break down in a two-to-four week period. Use where concrete surfaces will receive other materials.

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F. Bonding Agent, Patching Mortar: Cementitious slurry containing polymer-modified latex admixture, such as one of the following:

a. "SikaTop 121, 122 or 123"; Sika Corporation

b. "Flexcon"; Euclid Chemical Co.

c. "Everbond"; L & M

G. Waterstops:

1. Provide in all concrete construction joints as shown on drawing details. Material shall be 1” x ¾” Bentonite type weighing not less than .5lbs per linear foot as manufactured by Cetco, Waterwstop RX or equal.

H. Epoxy Injection Adhesive: Two component, 100% solids, low viscosity, moisture tolerant epoxy adhesive formulated for grouting and sealing dry and damp cracks.

1. Sikadur 52 by the Sika Corp. or approved equal.

PART 3 - EXECUTION

3.1 INSPECTION

A. Examine work prepared by other trades to receive work of this Section and report any defects affecting installation to the Contractor for correction. Commencement of work will be construed as complete acceptance of preparatory work by others.

3.2 HANDLING, STORAGE, AND PROTECTION OF MATERIALS

A. Handle and store materials separately in such manner as to prevent intrusion of foreign matter, segregation, or deterioration. Do not use foreign materials or those containing ice. Remove improper and rejected materials immediately from point of use. Cover materials, including steel reinforcement and accessories, during construction period. Stockpile concrete constituents properly to assure uniformity throughout project.

3.3 ERECTION OF FORMWORK

A. Set and maintain formwork to insure complete concrete work within tolerance limits listed in ACI 117 – Specification for Tolerances for Concrete Construction and Materials.

B. At construction joints, overlap and clamp forms (using gaskets if necessary) to prevent offsets or loss of mortar at joints.

C. Before reusing form materials, thoroughly clean surfaces that will be in contact with freshly cast concrete, repair damaged areas and withdraw projecting nails. Recoat form with release agent.

Re-use of form material for architecturally exposed concrete shall be subject to approval by CO.

3.4 PLACING OF REINFORCEMENT

A. Place reinforcement in accordance with requirements of CRSI "Placing Reinforcing Bars".

B. Place reinforcement in accordance with ACI 117 (Tolerances) and with Contract Documents and secure firmly in position by wire ties, chairs, spacers, and hangers, each of type approved by CO.

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C. Welding Reinforcement: Comply with AWS D1.4 for welding practices. Preheat and interpass temperatures shall comply with Table 5.2 of AWS D1.4. Provide mill reports to CO showing carbon content of reinforcing being welded.

D. Do not bend, tackweld or cut reinforcement in field in any manner other than as shown on Drawings unless specific approval for each case is given by CO.

E. Continue reinforcement through construction joints unless otherwise indicated on Drawings.

F. Splice reinforcement only in accordance with requirements of Contract Documents or as otherwise specifically approved by CO. Do not splice reinforcement at points of maximum stress unless shown on the Drawings. Welded wire fabric shall be lapped six inches or one and one-half spaces, whichever is larger, and shall be wired together.

G. At time concrete is placed, reinforcement shall be free of excessive rust, scale, or other coatings that will destroy or reduce bond. Paint reinforcement expected to be exposed to weather for a considerable length of time with a heavy coat of cement grout. Protect stored materials so as not to bend or distort bars in any way. Bars that become damaged will be rejected. Repair damage to coating of epoxy coated rebar in strict accordance with epoxy manufacturer's published instructions.

H. Before concrete is cast, check all reinforcement after it is placed to insure that reinforcement conforms to Contract Documents and approved Shop Drawings. Such checking shall be done only by qualified experienced personnel. In addition, notify the CO at least 36 hours prior to concrete placement so a visit may be made to observe completed reinforcement and formwork before concrete placement.

3.5 JOINTS

A. Construction joints indicated on Drawings are mandatory and shall not be omitted.

B. Joints not indicated or specified shall be placed to least impair strength of structure and shall be subject to approval of CO.

3.6 INSTALLATION OF EMBEDDED ITEMS

A. Conform to requirements of ACI-318, paragraph 6.3, "Conduits and Pipes Embedded in Concrete", and as specified below.

B. Install steel sleeves, furnished by other trades, at locations shown on the drawings.

3.7 MIXING, CONSISTENCY, AND DELIVERY OF CONCRETE

A. Use ready-mixed concrete produced by plant acceptable to CO. Hand or site mixing shall not be done. Batch constituents, including admixtures, at central plant. Admixtures shall be premixed in solution form and dispensed as recommended by manufacturer.

B. Concrete shall arrive at the job site at a slump of 2 to 4 inches and at the time of deposit shall be as follows.

1. If high-range water reducing admixture (superplasticizer) is used, it may be added at the job site after verifying that the delivery slump is 2 to 4 inches. Maximum slump after adding HRWR shall be 8 inches.

2. For lightweight concrete, use HRWR to offset slump loss between charging and discharging ends of pumping system.

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3. For normalweight concrete, water may be added at the site only to make up water withheld at the plant. Batching plant shall document on the driver's delivery ticket any water withheld at the plant. When water has not been withheld and slump is too low for proper handling of concrete, use HRWR to bring slump within specified range.

C. Transport ready mixed concrete to site in watertight agitator or mixer trucks loaded not in excess of rated capacities. Discharge at site within one and one-half hours after cement was first introduced into mix. Do not use concrete with a temperature greater than 85 degrees F.

Central mixed concrete shall be plant mixed a minimum of five minutes. Agitation shall begin immediately after premixed concrete is placed in truck and shall continue without interruption until discharged. Transit mixed concrete shall be mixed at mixing speed for at least ten minutes immediately after charging truck followed by agitation without interruption until discharged.

D. Do not retemper (mixing with or without additional cement, aggregates, or water) concrete which has partially hardened.

3.8 PLACING CONCRETE

A. If concrete pumping is proposed, refer to "Submittals, Concrete Constituents", in this Section for requirements. If lightweight concrete pumping is proposed, use a pipe diameter of 5 inches.

Concrete may be placed into the pump at the maximum but…