Cottonwood Combined Specs.pdf

Cottonwood Asphalt Repair

Table of Contents

Section 01009 General Requirements

Section 02223 Selective Site Demolition

Section 02300 Earthwork

Section 02725 Crushed Aggregate Base and Surface Course

Section 02744 Repair of Bituminous Concrete Pavement

Section 03300 Cast-in-Place Concrete

APRIL 2020 GENERAL REQUIREMENTS

COTTONWOOD ASPHALT REPAIR 01009 - 1

SECTION 01009 – GENERAL REQUIREMENTS

PART 1 - GENERAL

1.1 SUMMARY

A. Description of Work: Mobilization to site, furnishing labor, equipment, supplies, and materials to remove, clear tree roots, and replace selected damaged asphalt pavement around the Cottonwood recreational site.

Asphalt pavement removed from the host site RV parking pad shall be replaced with cast-in-place structural concrete.

B. Location: Work under this Contract is located at the BLM’s Cottonwood Campground in Ellis Idaho.

Project location is 15.5 miles Northeast of Challis Idaho in Custer County on Hwy 93. The work location is shown on the attached drawings.

1.2 DEFINITIONS

A. Approvals: Approval of the submittals is an indication that the Contractor's submittals have been reviewed and that there are no objections, except as noted. Approval of deviations shall apply only to those deviations or omissions from the requirements of the drawings and specifications brought to the Contracting Officer's attention in writing. After approval of an item, submit a substitute for approval when the approved item cannot be purchased or delivered in time to avoid delay in completion of the project.

1.3 SUBMITTALS

A. Product Data: Submittals include product data sheets and written certifications for proposed materials.

B. Requirements: Refer to specifications for submittals required. Allow at least 3 working days for review.

Submittals shall be emailed or delivered to Bureau of Land Management, 1405 Hollipark Drive Idaho Falls, Idaho. Attn: Josh Connors. Email: jconnors@blm.gov.

C. Identification of Submittals: Completely identify each submittal by showing at least the following information:

1. Name and address of submitter, plus name and telephone number of the individual to contact for further information.

2. Name of project as it appears in these specifications.

3. Contract number, drawing number, and specification section number to which the submittal applies.

4. Whether this is an original submittal or resubmittal.

5. Each item shall clearly note the manufacturer's name and address, trade name, product, lot, style, color, catalog designation or model number, and locations of use.

1.4 CERTIFICATES OF CONFORMANCE

A. Requirements: The Contracting Officer may permit use, prior to sampling and testing, of materials when accompanied by Certificates of Conformance. Materials used on the basis of a Certificate of

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Conformance may be sampled and tested. Installation of materials on the basis of Certificates of Conformance shall not relieve the Contractor of responsibility for incorporating materials which conform to the requirements of the drawings and specifications. Material not conforming to those requirements will be subject to rejection, whether in place or not.

B. Format: The Certificate of Conformance provided by the supplier shall:

1. State that the named product conforms to the Contract requirements.

2. Either be accompanied with a certified copy of the test results or certify that such test results are on file with the manufacturer and will be furnished to the Contracting Officer upon request.

3. Provide the name and address of the manufacturer, the testing agency, and the date of tests.

4. Set forth the means of identification which will permit field determination of the product delivered as being the product covered by the certification.

1.5 QUALITY ASSURANCE

A. Codes and Standards: The work shall comply with codes and standards applicable to each type of work and as listed in the individual sections of these specifications. This Contract incorporates materials, applications, and tests by reference, with the same force and effect as when they were given in full text.

B. Conflict: Where a conflict occurs between reference documents and project specifications, the project specifications shall govern.

C. Measurements: Where Government drawings and on-site dimensions differ, on site dimensions shall take precedence over dimensions indicated on the drawings.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Delivery: Protect products incorporated into the work from damage while in transit to the site. Products must be delivered in original unopened containers with manufacturer's name, brand designation, and contents legibly indicated.

B. Storage: Provide temporary storage facilities for products. Storage shall comply with the manufacturer's instructions. The storage area shall permit access for inspection and handling.

C. Handling: Load and unload products protecting them from damage.

1.7 PROJECT/SITE CONDITIONS

A. Access to the Work: Access is via paved public highways. Work locations are shown on the drawings.

B. Environmental Considerations: The Contractor shall take necessary precautions to prevent the entry of any petroleum product into adjacent waterways and tributaries. The Contractor shall be responsible for prevention and control of water pollution caused by construction activities. Fueling and servicing of equipment, loading of product tanks, etc., shall take place a minimum of 300 feet away from adjacent waterways.

C. Closing of Worksite to Public and Government Use:

1. Recreation Sites: All recreation facilities shall be accessible to the public during normal operating hours. During contract work, selected sections of the recreation site can be closed off for contractor workspace and public safety. The Contracting Officer shall be notified a minimum of 10 days in advance of proposed section closures.

2. The Contractor is responsible for providing and maintaining the needed barricades, signs, etc.

required to close the selected sections of the recreation site to public use. The barricades and signs

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used for selected closures shall be in compliance with the current edition of the Manual on Uniform Traffic Control Devices.

1.9 SEQUENCING AND SCHEDULING

A. Work Schedule: The schedule shall be submitted at the pre-work conference. When requested, submit an updated schedule within 3 calendar days. As a minimum, the estimated start and completion dates shall be shown in the estimate.

B. Closures: The Contractor shall schedule time of closures so all work is performed and completed during a normal work week, Monday through Friday and shall not schedule any closures that may affect legal National Holidays.

PART 2: PRODUCTS

(There are no applicable requirements.)

PART 3: EXECUTION

3.1 PROJECT MEETINGS

A. Pre-Work Conference:

1. Will be held prior to the start of work. The Contractor will be notified in advance of meeting time, date and place. The purpose will be to review required work, project drawings and specifications, construction schedules, payroll and payments, and administrative provisions of the Contract.

2. The Contractor, subcontractors and the persons responsible for coordination of the work shall be present at the meeting.

3. Be prepared to summarize and explain procedures planned for the project and present the submittals requested in the specifications.

B. Progress Meetings:

1. To be held at the project site, or as determined by the Contracting Officer.

2. May be called by either the Contracting Officer or the Contractor. Request shall state who should attend and include an agenda.

C. Final Inspection:

1. To be held at the project site, or as determined by the Contracting Officer.

2. Notify the Contracting Officer in writing at least 2 working days before the completion date so the

Government can schedule final inspection.

3. The superintendent shall be present during this inspection.

3.2 PREPARATION

A. Work Layout: The Government shall establish the work layout for all contracted work.

B. Work Limits and Control Points: Will be established by the Contracting Officer.

3.3 DISPOSAL OF DEBRIS

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A. Requirements: Items or debris not designated as salvage for the Government shall become the property of the Contractor. Disposal of materials in a legal manner and payment of fees required is the Contractor's responsibility. Burning of removed materials is not permitted on the work site.

3.4 AS-BUILT DRAWINGS

A. General Requirements: N/A

B. Installation Changes: Records shall be maintained of actual installations where at variance with the work shown, where changed, or where not otherwise located by dimension, elevation or other reference on the Contract drawings.

3.5 WARRANTY

A. Requirements: Materials and equipment furnished under this Contract shall be covered by the most favorable commercial warranties given to customers for such materials or equipment. The rights or remedies provided herein are in addition to and do not limit rights afforded to the Government by other clauses of this Contract. With respect to warranties, expressed or implied, from manufacturers or suppliers for materials or equipment furnished under the Contract the Contractor shall:

1. Obtain warranties that would be given in normal commercial practices.

2. Require warranties to be executed, in writing, for the benefit of the Government.

3. Submit warranties to the Contracting Officer prior to the final inspection.

PART 4: MEASUREMENT AND PAYMENT

4.1 METHOD OF MEASUREMENT

A. The intent of these paragraphs are to explain, in general, what is and what is not included in a pay item, and the limits or cut-off points where one pay item ends and another begins.

B. If no pay item exists for a portion of the work, include the costs in a related pay item.

C. Item 01009 – 01 Mobilization: This will not be measured for payment but will be paid for as Lump Sum.

D. Item 02223 – 01 Selective Site Demolition Including removal of 1 (EA) Stump: This item includes all work described in Section 02223. It will be measured for payment and will be paid for as Square Yards.

E. Item 02744 – 01 Repair of Bituminous Concrete Pavement: This item includes all works described in

Section 02744. It will be measured for payment and will be paid for as Square Feet.

F. Item 02725 – 01 Base Course: This item includes all work described in Section 02725. It will be measured for payment and will be paid for as Square Yards.

G. Item 03300 – 01 Cast-in-Place Concrete: This item includes all work described in Section 03300. It will be measured for payment and will be paid for as Cubic Yards.

4.2 BASIS OF PAYMENT

A. Payment: No direct payment for the work described under this section will be made. Consideration for this item shall be included in the bid price for other items of the Contract. Payment will be made at the Contract price, as indicated in the Bid Schedule, and will include full compensation for the work described in the Contract.

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END OF SECTION

APRIL 2020 SELECTIVE SITE DEMOLITION

COTTONWOOD ASPHALT REPAIR 02223-1

SECTION 02223 – SELECTIVE SITE DEMOLITION

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes: This section specifies the demolition and disposal of Government selected sections of asphalt pavement. This includes any obstructing tree roots located under the asphalt and Government selected tree stumps.

1.2 PROJECT/SITE CONDITIONS

A. Work Limits and Control Points: Will be established by the Government.

B. Environmental Considerations:

1. Prevent dust from becoming a nuisance to the public, to adjacent areas, and to other work being performed on or near the site. Watering for dust control shall be at Contractor's expense.

C. Notify the Contracting officer 10 days in advance of beginning site clearing activities so that the government may notify the public of the interruption of full service in the campground.

PART 2 - PRODUCTS (There are no applicable requirements.)

PART 3 - EXECUTION

3.1 EXAMINATION

A. Verification of Conditions: Visit the site and verify the extent and location of the demolition work required. Photograph existing damage to structure surfaces, equipment, or to surrounding properties which could be misconstrued as damage resulting from demolition work and give copies to the Contracting Officer prior to starting work.

3.2 PREPARATION

A. Landscape Preservation: Protect vegetation that is outside the work limits from injury.

B. Protection: Protect existing buildings, facilities or utilities outside the work limits from damage. Damage shall be repaired or replaced at the Contractor's expense. Repair work shall not begin until authorized in writing by the Contracting Officer.

C. Traffic Control: All operations shall be conducted with minimum interference to the public.

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3.3 DEMOLITION

A. General: Demolish and dispose of asphalt pavement, associated tree roots, and tree stumps as established and marked by the Government.

B. Removal of all Asphalt Surfaces or Structures: This is to include all of the Government selected asphalt pavement. Noise levels above 90 db or impact levels above 2000 ft-lbs must be approved in writing by the Contracting Officer. Break asphalt into pieces weighing a maximum of 150 pounds apiece and dispose of off government-controlled lands in a legal manner.

C. Roots Removal: Excavate a minimum of 18 inches into the subgrade along the outside perimeter of the repair area. In addition to the perimeter excavation, excavate any area where the subgrade appears to have been disturbed by the growth of roots. Removal from the subgrade all roots. The subgrade shall be approved by the Contracting Officer prior to commencement of backfilling and compaction.

D. Stump Removal: This is to include removal of all Government selected tree stumps. Conduct the removal of all government selected tree stumps in a manner that shall not cause damage to existing structures or trees. Use of burning or chemicals shall not be approved. Dispose of off government-controlled lands in a legal manner.

3.4 EXPLOSIVES

A. Requirements: Use of explosives will not be approved.

3.5 BURNING

A. The use of burning at the project site on government-controlled lands will not be permitted.

3.6 DISPOSAL OF DEBRIS

A. Requirements: Items or debris not designated as salvage for the Government shall become the property of the Contractor. Remove and dispose of such materials off government-controlled lands according to Section 01009 – General Requirements.

3.7 BACKFILLING

A. General: Fill cavities caused as a result of demolition.

B. Backfill Placement: Backfill materials shall be spread over the full width of the cross section of the cavity to a maximum loose thickness of 6-inches and shall be compacted as specified below before the next layer is spread. Use any type of compaction equipment except rubber-tired or smooth-steel-wheel rollers to obtain the required degree of compaction. The in-place materials shall be free of lenses, pockets, streaks, or layers of materials differing substantially in texture or gradation from the surrounding materials.

C. Frozen Material: Embankment shall not be placed when either the material or the surface on which it is to be placed is frozen.

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3.8 CLEANUP

A. Site Grading: Rough grade areas affected by demolition maintaining grades and contours of site.

END OF SECTION 02223

APRIL 2020 EARTHWORK

COTTONWOOD ASPHALT REPAIR 02300-1

SECTION 02300 - EARTHWORK

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Preparing subgrades for asphalt and concrete pavements.

2. Subbase course and base course for asphalt and concrete pavements.

1.2 DEFINITIONS

A. Backfill: Soil material used to fill an excavation.

B. Base Course: Aggregate layer placed between the subbase course and pavements.

C. Borrow Soil: Satisfactory soil imported from off-site for use as fill or backfill.

D. Excavation: Removal of material encountered above subgrade elevations and to lines and dimensions indicated.

1. Authorized Additional Excavation: Excavation below subgrade elevations or beyond indicated lines and dimensions as directed by Contracting Officer. Authorized additional excavation and replacement material will be paid for according to Contract provisions for changes in the Work.

2. Unauthorized Excavation: Excavation below subgrade elevations or beyond indicated lines and dimensions without direction by Contracting Officer. Unauthorized excavation, as well as remedial work directed by Contracting Officer, shall be without additional compensation.

E. Fill: Soil materials used to raise existing grades.

F. Structures: Buildings, footings, foundations, retaining walls, slabs, tanks, curbs, mechanical and electrical appurtenances, or other man-made stationary features constructed above or below the ground surface.

G. Subbase Course: Aggregate layer placed between the subgrade and base course for concrete pavement.

H. Subgrade: Uppermost surface of an excavation or the top surface of a fill or backfill immediately below subbase, drainage fill, drainage course, or topsoil materials.

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I. Utilities: On-site underground pipes, conduits, ducts, and cables, as well as underground services within buildings.

1.3 SUBMITTALS

A. There are no applicable requirements.

1.4 QUALITY ASSURANCE

A. Pre-excavation Conference: Conduct conference at Project site.

1.5 PROJECT CONDITIONS

A. Utility Locator Service: Notify utility locator service for area where Project is located before beginning earth moving operations.

PART 2 - PRODUCTS

A. There are no applicable requirements.

PART 3 - EXECUTION

3.1 PREPARATION

A. Protect structures, utilities, sidewalks, pavements, and other facilities from damage caused by settlement, lateral movement, undermining, washout, and other hazards created by earth moving operations.

B. Protect subgrades and foundation soils from freezing temperatures and frost. Remove temporary protection before placing subsequent materials.

3.2 EXCAVATION, GENERAL

A. Unclassified Excavation: Excavate to subgrade elevations regardless of the character of surface and subsurface conditions encountered. Unclassified excavated materials may include rock, soil materials, and obstructions. No changes in the Contract Sum or the Contract Time will be authorized for rock excavation or removal of obstructions.

1. If excavated materials intended for fill and backfill include unsatisfactory soil materials and rock, replace with satisfactory soil materials.

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3.3 EXCAVATION FOR STRUCTURES

A. Excavate to indicated elevations and dimensions within a tolerance of plus or minus 1 inch. If applicable, extend excavations a sufficient distance from structures for placing and removing concrete formwork, for installing services and other construction, and for inspections.

3.4 SUBGRADE INSPECTION

A. Proof-roll subgrade below the building slabs and pavements with a vibratory plate compactor or jumping jack to identify soft pockets and areas of excess yielding. Do not proof-roll wet or saturated subgrades.

B. Reconstruct subgrades damaged by freezing temperatures, frost, rain, accumulated water, or construction activities, as directed by Contracting Officer, without additional compensation.

3.5 UNAUTHORIZED EXCAVATION

A. Fill unauthorized excavation under foundations or wall footings by extending bottom elevation of concrete foundation or footing to excavation bottom, without altering top elevation. Lean concrete fill, with 28-day compressive strength of 2500 psi, may be used when approved by Contracting Officer.

1. Fill unauthorized excavations under other construction, pipe, or conduit as directed by Contracting Officer.

2. Over excavation will not be permitted on the north side of the pads due to utility lines.

3.6 STORAGE OF SOIL MATERIALS

A. Stockpile borrow soil materials and excavated satisfactory soil materials without intermixing.

Place, grade, and shape stockpiles to drain surface water. Cover to prevent windblown dust.

1. Stockpile soil materials away from edge of excavations.

3.7 SOIL MOISTURE CONTROL

A. Uniformly moisten or aerate subgrade and each subsequent fill or backfill soil layer before compaction to within 2 percent of optimum moisture content.

1. Do not place backfill or fill soil material on surfaces that are muddy, frozen, or contain frost or ice.

2. Remove and replace, or scarify and air dry, otherwise satisfactory soil material that exceeds optimum moisture content by 2 percent and is too wet to compact to specified dry unit weight.

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3.8 COMPACTION OF SOIL BACKFILLS AND FILLS

A. Place backfill and fill soil materials in layers not more than 8 inches in loose depth for material compacted by heavy compaction equipment, and not more than 4 inches in loose depth for material compacted by hand-operated tampers.

B. Place backfill and fill soil materials evenly on all sides of structures to required elevations, and uniformly along the full length of each structure. All surfaces shall be free of any change in level greater than ½” and must comply with all ADA standards for accessible routes.

C. Compact soil materials to not less than the following percentages of maximum dry unit weight according to ASTM D 698:

1. Under structures, building slabs, steps, and pavements, scarify and compact top 12 inches of existing subgrade and each layer of backfill or fill soil material at 97 percent.

2. Under turf or unpaved areas, scarify and compact top 6 inches below subgrade and compact each layer of backfill or fill soil material at 85 percent.

3.9 SUBBASE AND BASE COURSES UNDER ASPHALT AND CONCRETE PAVEMENTS

A. Place subbase course and base course on subgrades free of mud, frost, snow, or ice.

B. On prepared subgrade, place subbase course and base course under pavements and walks as follows:

1. Place subbase course and base course that exceeds 6 inches in compacted thickness in layers of equal thickness, with no compacted layer more than 6 inches thick or less than 3 inches thick.

2. Compact subbase course and base course at optimum moisture content to required grades, lines, cross sections, and thickness to not less than 97 percent of maximum dry unit weight according to ASTM D 698.

3.10 PROTECTION

A. Protecting Graded Areas: Protect newly graded areas from traffic, freezing, and erosion. Keep free of trash and debris.

B. Repair and reestablish grades to the specified tolerances where completed or partially completed surfaces become eroded, rutted, settled, or where they lose compaction due to subsequent construction operations or weather conditions.

C. Where settling occurs before Project correction period elapses, remove finished surfacing, backfill with additional soil material, compact, and reconstruct surfacing.

1. Restore appearance, quality, and condition of finished surfacing to match adjacent work, and eliminate evidence of restoration to greatest extent possible.

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3.11 DISPOSAL OF SURPLUS AND WASTE MATERIALS

A. Refer to Section 01009 - General Requirements for disposal of debris.

END OF SECTION 02300

APRIL 2020 CRUSHED AGGREGATE BASE AND SURFACE COURSE

COTTONWOOD ASPHALT REPAIR 02725-1

SECTION 02725 - CRUSHED AGGREGATE BASE AND SURFACE COURSE

PART 1: GENERAL

A. Section Includes: Furnishing, placing, and compacting crushed Aggregate on a prepared surface.

1.2 SUBMITTALS

A. General: Submittals shall be according to Section 01009 – General Requirements.

B. Weight Tickets: Submit one copy of certified weight tickets for each load of aggregate delivered to project site.

C. Certificates of Conformance: If materials are obtained from a commercial source, submit written certification from the supplier of the Contractor-furnished aggregate to be used on this project that it conforms to the requirements of this specification section.

1.3 QUALITY ASSURANCE

A. The Government reserves the right to perform quality control testing at times and locations as determined by the Contracting Officer.

1.4 DELIVERY, STORAGE AND HANDLING

A. Delivery: Mitigate spillage or damage that occurs during delivery.

1.5 PROJECT/SITE CONDITIONS

A. Excess Materials Delivered to the Site: Shall be removed from the site at the owner's expense and deducted from the pay quantity.

1.6 WARRANTY

A. Requirements: Aggregate base found to be defective within 12 months after work completion, shall be replaced at the Contractor's expense. Overlaying material that must be replaced because of defective base material shall also be replaced at the Contractor's expense.

2.1 3/4 CRUSHED AGGREGATE BASE MATERIAL

APRIL 2020 CRUSHED AGGREGATE BASE AND SURFACECOURSE

COTTONWOOD ASPHALT REPAIR 02725-2

A. Contractor-Furnished Crushed 3/4" Base Aggregate: This material is specified for all base material for concrete slabs and sidewalks. Shall consist of hard, durable, angular particles or fragments of crushed stone or crushed gravel. Shall be crushed to the size and quality requirements for crushed aggregate materials normally used locally in the construction and maintenance of highways. Shall be according to AASHTO T96.

1. Shall comply with all Idaho Transportation Department

Standard Specifications for Highway Construction requirements for nominal maximum size 3/4" aggregate as stated in 2017 ITD Standard Specifications for Highway Construction, Section 703.04, Aggregate for Untreated Base, Treated Base, and Road Mix.

2. The percentage of aggregate retained on the 4.75mm (No. 4) sieve having at least one fractured face as determined by Idaho T-71 shall be 75%.

B. Gradations required for aggregates are listed below. These are reprinted from the 2017 ITD Standard Specifications for Highway Construction-Table 703.04-1 ¾ in. B aggregate gradation requirements.

Nominal Maximum

Size Sieve Size

3/4 inch

Percent Passing 2-1/2"

2" 1" 100

3/4" 90-100 No. 4 40-65 No. 8 30-50 No. 30 No. 200 3.0-9.0

2.2 WATERING

A. Furnish, haul and apply water required for compaction of base and surface course aggregate materials for sidewalks, concrete pads, and campsite use pad construction.

3.1 CONSTRUCTION REQUIREMENTS

A. Placing: The material shall be placed on the prepared subgrade in layers of the thickness shown on the plans. When more than one layer is required, each layer shall be shaped and compacted before the succeeding layer is placed.

APRIL 2020 CRUSHED AGGREGATE BASE AND SURFACECOURSE

COTTONWOOD ASPHALT REPAIR 02725-3

B. Compacting: Immediately following final spreading and smoothing, each layer shall be compacted full width by approved means of compacting equipment.

1. Compaction of each layer shall continue until a density of not less than 95 percent of the maximum density determined according to AASHTO T 180, Method D, or other approved method, has been achieved.

2. In-place field density determinations will be made according to AASHTO T 191, T 205, or other approved method. The use of AASHTO T 224 to correct for oversize particles may be required.

C. Thickness Requirements: The thickness of the completed course shall not vary more than 1/2-inch from the thickness shown on the plans.

D. Surface Requirements: When directed by the Contracting Officer, the surface shall be tested with a 10-foot straight-edge furnished and operated by the Contractor. Any areas where the surface variation exceeds 1/2-inch in 10 feet shall be reworked until the variation falls within this limit.

E. Traffic Control: The Contractor shall provide the controls to prevent unauthorized traffic in or on work areas until those areas are suitably prepared for traffic.

3.2 MAINTENANCE

A. Maintain base and surface courses in a satisfactory condition until final acceptance.

APRIL 2020 REPAIR OF BITUMINOUS CONCRETE PAVEMENT

COTTONWOOD ASPHALT REPAIR 02744 - 1

SECTION 02744 - REPAIR OF BITUMINOUS CONCRETE PAVEMENT

PART 1: GENERAL

A. Section Includes: Removal and replacement of Government selected damaged asphalt pavement. This includes the removal of any obstructing tree roots located under the government selected damaged asphalt pavement.

1.2 SUBMITTALS

A. General: Submittals shall be according to Section 01009 – General Requirements.

B. Certificates of Conformance: Submit three copies of written certification from the supplier of bituminous material used in the mix to be used on this project that it conforms to the requirements of this specification section.

C. Job Mix Formula: Submit a job mix formula, prepared within one year of submittal, for approval by the

Contracting Officer prior to preparing and placing the bituminous mixture. Design mix using procedures contained in Chapter III, Marshall Method of Mix Design, of the Asphalt Institute MS-2. The formulas shall indicate the physical properties of the mixes as shown by tests made by an approved commercial laboratory using materials identical to those to be used on this project. Submit all formulas with materials samples. The job mix formula for each mixture shall be in effect until modified in writing by the Contractor and approved by the Contracting Officer. Provide a new job mix formula for each source change.

1. Required Data: The job-mix formula shall show the following: the source and proportions

(percent by weight) of each ingredient of the mixture; the correct gradation (the percentages passing each size sieve listed in the specifications for the mixture to be used) for the aggregate and mineral filler from each separate source and from each different size to be used in the mixture and for the composite mixture; the amount of material passing the No. 200 sieve determined by dry sieving; the number of blows of hammer compaction per side of molded specimen; the temperature viscosity relationship of the asphalt cement; the stability, flow, percent voids in mineral aggregate, percent air voids, unit weight; asphalt absorption by the aggregate; effective asphalt content as percent by weight of total mix; the temperature of the mixture immediately upon completion of mixing; the asphalt viscosity grade and/or penetration range; and

The Results of: As Determined by:

Specific Gravity of Asphalt ASTM D 70 Coarse Aggregate:

Bulk Specific ASTM C 127 Abrasion Loss ASTM C 131 Soundness Loss ASTM C 88 Weight of Slag ASTM C 29 % Crushed Pieces in Gravel Counting - by Observation and Weight Fine Aggregates:

Bulk Specific Gravity ASTM C 128 Soundness Loss ASTM C 88 Mineral Filler - Specific Gravity ASTM C 188 or D 854 Bituminous Mixture:

Bulk Specific Gravity ASTM D 1188 or D 2726 Theoretical Maximum Specific Gravity ASTM D 2041

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Index of Retained Strength ASTM D 1075

2. Selection of Optimum Asphalt Content: Base selection on percent of total mix and the average of the values at the following points on the curves for each mix:

Stability Peak Unit Weight Peak

Percent Air Voids Median

3. Variations from Formula: Variations from the approved job-mix formula shall not exceed the following: however, in no case shall the job-mix formula, with tolerances applied, fall outside the general limits for aggregate gradation and bituminous material specified herein:

Aggregate Tolerance (Plus or Minus)

1/2-inch and larger 8 percent 3/8-inch and No. 4 7 percent No. 8 and 16 6 percent No. 30 and 50 5 percent No. 100 4 percent No. 200 3 percent Asphalt Cement 0.3 percent Temperature of Mixture as Discharged 20 degrees F

D. Placement Plan: Submit a plan for grade control and paving operations. Plan should include an itemized list of equipment and personnel to be used.

1.3 QUALITY ASSURANCE

A. Quality Assurance Plan: The Contractor shall submit a written quality assurance plan that details his quality control and inspection procedures that will insure compliance with these specifications.

B. Failure Criteria: Not limited to the following:

1. Creeping, shoving, cracking, raveling, or softening of the asphalt concrete.

1.4 DELIVERY, STORAGE AND HANDLING

A. Storage: Store aggregates in such a manner as to prevent segregation, contamination, or intermixing of the different aggregate sizes.

1.5 PROJECT/SITE CONDITIONS

A. Weather Limitations: Place bituminous mixture only during dry weather and on dry surfaces. Place courses only when the surface temperature of the underlying course is greater than 45 degrees F.

2.1 MATERIALS

A. Bituminous Concrete Pavement: Shall meet all requirements of and be certified as a locally approved State of Idaho Class III, 1/2" Aggregate Size plant mix pavement according to the Idaho Transportation Department Standard Specifications for Highway Construction (2004), Section 405 - Plant Mix Pavement.

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B. Aggregates: Shall meet all requirements of plant mix pavement aggregates according to the Idaho Transportation Department Standard Specifications for Highway Construction (2004), Section 405 - Plant Mix Pavement and Section 703.05 - Aggregate for Plant Mix Pavement.

C. Asphalt: Shall conform to AASHTO MP-1, Standard Specification for Performance Graded Asphalt Binder in accordance with the Idaho Transportation Department Standard Specifications for Highway Construction (2004), and Section 702.01 - Asphalt. The asphalt grade shall not vary from that specified in the approved Class I mix design.

D. Bituminous Tack Coat: Shall be emulsified asphalt of type and grade SS-1, SS-1h (ASTM D-977) or

CSS-1, CSS-1h (ASTM D-2397), CR5-2.

2.2 CONSTRUCTION EQUIPMENT

A. General: Construction equipment used shall be dependable and adequate for the purpose intended, properly maintained in satisfactory and safe operating condition at all times. Calibrated equipment, such as scales, batching equipment, spreaders and similar equipment, shall have been recalibrated by an approved calibration laboratory within 12 months of commencing work.

B. Paving Equipment:

1. Spreading Equipment: Self-propelled type, unless other equipment is authorized by the Contracting Officer. Equip with hoppers, tamping or vibrating devices, distributing screws, electronically adjustable screeds, and equalizing devices. Capable of spreading hot bituminous mixtures without tearing, shoving, or gouging and to produce a finished surface of specified grade and smoothness. Operate spreaders, when laying mixture, at variable speeds between 5 and 45 feet per minute. Spreader shall have a quick and efficient steering device; a forward and reverse traveling speed; and devices to adjust to grade and confine the edges of the mixture to true lines.

The use of a spreader that leaves indented areas or other objectionable irregularities in the fresh mix during operations will not be permitted.

2. Rolling Equipment: Self-propelled pneumatic-tired rollers supplemented by three-wheel and tandem type steel wheeled rollers. The number, type and weight of rollers shall be sufficient to compact the mixture to the required density without detrimentally affecting the compacted material. All rollers shall be suitable for rolling hot-mix bituminous pavements and capable of being operated both forward and backward without turning on the mat, and without loosening the surface being rolled. Equip rollers with suitable devices and apparatus to keep the rolling surfaces wet and prevent adherence of bituminous mixture.

a. Vibratory Rollers: At the Contractor's option, vibratory rollers especially designed for bituminous concrete compacting may be used provided rollers do not impair stability of pavement structure and any underlying layers. Repair depressions in pavement surfaces resulting from use of vibratory rollers at no cost to the Government. Rollers shall be self-propelled, single or dual vibrating drums, and steel drive wheels, as applicable;

equipped with variable amplitude and separate controls for energy and propulsion.

3. Hand Tampers: Shall have a minimum weight of (25 pounds) with a tamping face of not more than (200 square inches).

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3.1 REMOVAL OF EXISTING BITUMINOUS ASHPHALT

A. Saw Cutting: Saw cut asphalt around the area of existing asphalt to be removed. Cut a minimum of 50% of the asphalt depth, but not less than 1 inch.

B. Removal of Existing Asphalt: Carefully removed asphalt so as not to damage existing asphalt that is to remain. Dispose of removed asphalt in accordance with the requirements of Section 01009 - General Requirements.

3.2 REMOVAL OF ROOTS

A. Root Removal: Excavate a minimum of 18 inches into the subgrade along the outside perimeter of the repair area. In addition to the perimeter excavation, excavate any area where the subgrade appears to have been disturbed by the growth of roots. Removal from the subgrade all roots. The subgrade shall be approved by the Contracting Officer prior to commencement of backfilling and compaction.

3.3 SUBGRADE BACKFILL AND COMPACTION

A. Backfill: Backfill excavated area with existing material to match the grade of adjacent subgrade. When additional material is needed to compete backfill, use 1” minus crushed aggregate.

B. Subgrade Compaction: A jumping jack mechanical compactor (whacker) shall be used to compact the subgrade. Add water as needed to achieve a minimum compaction of 95% of optimum dry density.

3.4 SUBGRADE AND ASPHALT EDGE PREPARATION

A. Surface Preparation of Underlying Course: Prior to the laying of the asphalt concrete, clean underlying course of all foreign or objectionable matter with power blowers or power brooms, supplemented by hand brooms and other cleaning methods where necessary.

B. Preparation of Aggregate Surfaces: Immediately before asphalt placement, the Contracting Officer may order a light application of water to lay dust and improve the absorbency of the surface.

B. Preparation of Edge of Existing Bituminized and Concrete Surfaces: The edges of existing pavement, which are to be adjacent to new pavement, shall be cleaned of loose material to permit adhesion of the bitumen. Furnish and apply a bituminous tack coat over existing asphalt or concrete surfaces and edges at a coverage of 0.05 to .15 gallons per square yard depending on condition of existing surface. The rate of application shall be approved by the Contracting Officer. Tack coat shall be applied only when the existing surface is dry and the atmospheric temperature is above 60 degrees.

C. Approval of Subgrade: The subgrade and edges of existing pavement shall be approved by the

Contracting Officer prior to placement of replacement bituminous asphalt.

3.5 APPLICATION

A. Placing of Bituminous Material: The pavement shall consist of hot mineral aggregate uniformly mixed with hot bituminous material. Pavement shall be placed one lift. Finish grade of replacement bituminous asphalt shall match the grade of adjacent existing asphalt. Where possible, grade the bituminous asphalt to drain to outside edge.

B. Bituminous Mixing Plant: Plants used for the preparation of bituminous mixtures shall conform to

AASHTO M 156 and to Idaho Transportation Department requirements.

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C. Transportation of Bituminous Mixtures: If air temperature is less than 60 degrees F or if haul time is greater than 30 minutes, cover each load with canvas or other approved material of ample size to protect the mixture from the loss of heat.

D. General Requirements for Use of Bituminous Spreaders: The range of temperatures of the mixtures at the time of spreading shall be between 250 and 300 degrees F. Spread material so that the surface of the course is smooth and continuous without tears and pulling, and of such depth that, when compacted, the surface conforms to the requirements of this section. The thickness of the asphalt mat shall match that of adjacent existing bituminous asphalt surfacing, but shall not be less than 3 inches thick.

E. Placing of Bituminous Material: The pavement shall consist of hot mineral aggregate uniformly mixed with hot bituminous material. Place the pavement in one layer.

F. Shoveling, Raking, and Tamping After Machine-spreading: A sufficient number of shovelers and rakers shall follow the spreading machine adding or removing hot mixture and raking the mixture as required to obtain a course that when completed will conform to all requirements specified herein. Broadcasting or fanning of mixture over areas being compacted is not permitted. When segregation occurs in the mixture during placing, suspend spreading operation until the cause is determined and corrected. Correct any irregularities in alignment left by the spreader by trimming directly behind the machine. Immediately after trimming, compact edges of the course by tamping laterally with a metal lute or by other approved methods. Distortion of the course during tamping is not permitted.

G. Hand-spreading in Lieu of Machine-spreading: In areas where the use of machine spreading is impractical, spread mixture by hand. The range of temperatures of the mixtures when dumped onto the area to be paved shall be between 250 and 300 degrees F. Bituminous concrete having temperatures less than minimum spreading temperature when dumped onto the area to be paved will be rejected. Spread mixture with hot rakes in a uniformly loose layer of a thickness that, when compacted, will conform to the required grade, thickness, and smoothness. During hand spreading, place each shovelful of mixture by turning the shovel over in a manner that will prevent segregation. In no case shall the mixture be placed by throwing or broadcasting from a shovel. Do not dump loads any faster than can be properly handled by the shovelers and rakers.

H. Compaction of Mixture: Affect compaction by rolling, or on small areas, by use of vibratory plate compactors. Begin compaction as soon as placement of the mixture will bear the rollers or compactor without undue displacement. The speed of compaction shall be slow enough to avoid displacement of the hot mixture. Correct any displacement of the mixture at once by the use of rakes and fresh mixture, or remove and replace mixture as directed by the Contracting Officer. Continue rolling until all roller marks are eliminated and the course has a density of at least 92% but not more than 96% of that attained in a laboratory specimen of the same mixture prepared in accordance with ASTM D 1559

3.6 CLEANING

A. Requirements: The Contractor shall be responsible for cleanup of all waste, spilled, and excess material as a result of his work.

3.4 PROTECTION

A. Traffic Control: The Contractor shall provide for controls to prevent unauthorized traffic in or on work areas until those areas are suitably prepared for traffic

APRIL 2020 CAST-IN-PLACE CONCRETE

COTTONWOOD ASPHALT REPAIR 03300-1

SECTION 03300 - CAST-IN-PLACE CONCRETE

PART 1 - GENERAL

1.1 SUMMARY

A. This Section specifies cast-in place concrete, including formwork, reinforcement, concrete materials, mixture design, placement procedures, and finishes.

B. See Section 02300 - Earthwork for fill under slabs-on-grade.

1.2 SUBMITTALS

A. Material Data: For steel reinforcement.

B. Material Date: For geotextile.

C. Design Mixtures: For each concrete mixture.

1.3 QUALITY ASSURANCE

A. Manufacturer Qualifications: A firm experienced in manufacturing ready-mixed concrete products and that complies with ASTM C 94/C 94M requirements for production facilities and equipment.

B. ACI Publications: Comply with the following unless modified by requirements in the Contract Documents:

1. ACI 301, "Specification for Structural Concrete," Sections 1 through 5.

2. ACI 117, "Specifications for Tolerances for Concrete Construction and Materials."

C. Pre-installation Conference: Conduct conference at Project site.

PART 2 - PRODUCTS

2.1 FORM-FACING MATERIALS

A. Smooth-Formed Finished Concrete: Form-facing panels that will provide continuous, true, and smooth concrete surfaces. Furnish in largest practicable sizes to minimize number of joints.

B. Rough-Formed Finished Concrete: Plywood, lumber, metal, or another approved material.

Provide lumber dressed on at least two edges and one side for tight fit.

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2.2 STEEL REINFORCEMENT

A. Reinforcing Bars: ASTM A 615/A 615M, Grade 60, deformed.

B. Bar Supports: Bolsters, chairs, spacers, and other devices for spacing, supporting, and fastening reinforcing bars and welded wire reinforcement in place. Manufacture bar supports from steel wire, plastic, or precast concrete according to CRSI's "Manual of Standard Practice."

2.3 CONCRETE MATERIALS

A. Cementitious Material: Use the following cementitious materials, of the same type, brand, and source, throughout Project:

1. Portland Cement: ASTM C 150, Type I.

B. Normal-Weight Aggregates: ASTM C 33, graded, 3/4-inch nominal maximum coarse-aggregate size.

1. Fine Aggregate: Free of materials with deleterious reactivity to alkali in cement.

C. Water: ASTM C 94/C 94M and potable.

D. Air-Entraining Admixture: ASTM C 260.

E. Chemical Admixtures: Provide admixtures certified by manufacturer to be compatible with other admixtures and that will not contribute water-soluble chloride ions exceeding those permitted in hardened concrete. Do not use calcium chloride or admixtures containing calcium chloride.

1. Water-Reducing Admixture: ASTM C 494/C 494M, Type A.

2. Retarding Admixture: ASTM C 494/C 494M, Type B.

3. Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type D.

4. High-Range, Water-Reducing Admixture: ASTM C 494/C 494M, Type F.

5. High-Range, Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type G.

F. Synthetic Fiber: Monofilament or fibrillated polypropylene fibers engineered and designed for use in concrete pavement, 1/2 to 1-1/2 inches long.

2.4 CURING MATERIALS

A. Evaporation Retarder: Waterborne, monomolecular film forming, manufactured for application to fresh concrete.

B. Water: Potable.

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C. Clear, Waterborne, Membrane-Forming Curing Compound: ASTM C 309, Type 1, Class B, dissipating.

2.5 CONCRETE MIXTURES

A. Prepare design mixtures for each type and strength of concrete, proportioned on the basis of laboratory trial mixture or field test data, or both, according to ACI 301.

B. Cementitious Materials: Use fly ash, pozzolan, ground granulated blast-furnace slag, and silica fume as needed to reduce the total amount of Portland Cement, which would otherwise be used, by not less than 40 percent.

C. Proportion normal-weight concrete mixture as follows:

1. Minimum Compressive Strength: 4000 psi at 28 days.

2. Maximum Water-Cementitious Materials Ratio: 0.45.

3. Slump Limit: 4 inches, plus or minus 1 inch.

4. Air Content: 6 percent, plus or minus 1.5 percent at point of delivery for 3/4-inch nominal maximum aggregate size.

5. Synthetic Fiber: Uniformly disperse in concrete mixture at manufacturer's recommended rate, but not less than 1.0 lb. /cu. yd.

2.6 FABRICATING REINFORCEMENT

A. Fabricate steel reinforcement according to CRSI's "Manual of Standard Practice."

2.7 CONCRETE MIXING

A. Ready-Mixed Concrete: Measure, batch, mix, and deliver concrete according to ASTM C 94/C 94M, and furnish batch ticket information.

1. When air temperature is between 85 and 90 deg F, reduce mixing and delivery time from 1-1/2 hours to 75 minutes; when air temperature is above 90 deg F, reduce mixing and delivery time to 60 minutes.

PART 3 - EXECUTION

3.1 FORMWORK

A. Design, erect, shore, brace, and maintain formwork according to ACI 301 to support vertical, lateral, static, and dynamic loads, and construction loads that might be applied, until structure can support such loads.

B. Construct formwork so concrete members and structures are of size, shape, alignment, elevation, and position indicated, within tolerance limits of ACI 117.

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C. Chamfer exterior corners and edges of permanently exposed concrete.

3.2 EMBEDDED ITEMS

A. Place and secure anchorage devices and other embedded items required for adjoining work that is attached to or supported by cast-in-place concrete. Use setting drawings, templates, diagrams, instructions, and directions furnished with items to be embedded.

3.3 GEOTEXTILE

A. General: Comply with ITD Standard Specification 718.07 for material and placement standards.

3.4 STEEL REINFORCEMENT

A. General: Comply with CRSI's "Manual of Standard Practice" for placing reinforcement.

3.5 JOINTS

A. General: Construct joints true to line with faces perpendicular to surface plane of concrete.

B. Construction Joints: Install so strength and appearance of concrete are not impaired, at locations indicated or as approved by Contracting Officer.

3.6 CONCRETE PLACEMENT

A. Before placing concrete, verify that installation of formwork, reinforcement, and embedded items is complete and that required inspections have been performed.

B. Deposit concrete continuously in one layer or in horizontal layers of such thickness that no new concrete will be placed on concrete that has hardened enough to cause seams or planes of weakness. If a section cannot be placed continuously, provide construction joints as indicated.

Deposit concrete to avoid segregation.

1. Consolidate placed concrete with mechanical vibrating equipment according to ACI 301.

C. Cold-Weather Placement: Comply with ACI 306.1.

D. Hot-Weather Placement: Comply with ACI 305R.

3.7 FINISHING FORMED SURFACES

A. Rough-Formed Finish: As-cast concrete texture imparted by form-facing material with tie holes and defects repaired and patched. Remove fins and other projections that exceed specified limits on formed-surface irregularities.

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1. Apply to concrete surfaces not exposed to public view.

3.8 FINISHING FLOORS AND SLABS

A. General: Comply with ACI 304R recommendations for screeding, restraightening, and finishing operations for concrete surfaces. Do not wet concrete surfaces.

B. Float Finish: Consolidate surface with power-driven floats or by hand floating if area is small or inaccessible to power driven floats. Restraighten, cut down high spots, and fill low spots.

Repeat float passes and restraightening until surface is left with a uniform, smooth, granular texture.

C. Trowel Finish: After applying float finish, apply first troweling and consolidate concrete by hand or power-driven trowel. Continue troweling passes and restraighten until surface is free of trowel marks and uniform in texture and appearance.