AXOLOTL_CABIN_REINFORCEMENT_SPECIFICATIONS.pdf

AXOLOTL CABIN REINFORCEMENT

SPECIFICATION INDEX

General Information and Requirements .................................................................. Section MT-010000

Selective Demolition ............................................................................................... Section MT-017320

Structural Concrete ................................................................................................. Section MT-034100

Rough Carpentry and Structural Reinforcement ..................................................... Section MT-061053

AXOLOTL CABIN STRUCTURAL REINFORCEMENT

GENERAL REQUIREMENTS MT – 010000 – 1

SECTION MT - 010000 - GENERAL REQUIREMENTS

PART 1 - GENERAL

1.1 SUMMARY

A. Description of Work: Project consists of structural renovation of existing sub-structure support system at the Bureau of Land Management’s Axolotl Cabin. Work to include, but not necessarily limited to the following: replacement of column supports, foundation repair, as well as the addition of support girders, footings, joists, blocking, ledger board and fasteners.

B. Location: Work under this Contract is located in Madison County, Montana. The work locations are shown on the drawings. Axolotl Cabin can be accessed from Ennis by traveling southwest on State Highway 287 toward Virginia City. After traveling approximately 10.7 miles, turn south and travel 4 miles down Axolotl Lake Road until reaching the access road to Axolotl Cabin. Go through the access gate and travel an additional 0.1 miles to reach Axolotl Cabin.

C. Stipulations for performance Time and Site Closure: Contractor to accomplish site work in 21 calendar days within the given performance time for Site Closure Dates. No variance will be allowed in the Site Closure Dates to accommodate public recreational use in the area.

1. All site work shall commence on July 20th and be completed by August 9th, 2015. A construction schedule shall be submitted to the Contracting Officer at the Pre-Work Conference prior to any work beginning.

2. The Contractor shall be given additional time to perform precast concrete work prior to starting site work. This period will run from the time of award up until the beginning of the site work on July 20th. The Contractor shall have all pre-cast work completed by July 10th, with the remaining time leading up to the scheduled site work dates to be used as cure time for the pre-cast members.

1.2 REFERENCES

A. Referenced Specifications/Standards with Abbreviations and/or Acronyms: Wherever the following acronyms are used in these specifications or on the drawings, they are to be construed the same as the respective expressions represented. Copies of the referenced specifications/standards referred to herein may be procured by the Contractor from the following:

AASHTO

American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 225 Washington, DC 20001

ACI

American Concrete Institute P.O. Box 19150

GENERAL REQUIREMENTS MT – 010000 – 2

Detroit, MI 48219

AITC

American Institute of Timber construction 11818 S.E. Mill Plain Blvd., Suite 407 Vancouver, WA 98684

ANSI American National Standards Institute 1430 Broadway New York, NY 10018

AWPA

American Wood Preservers’ Association P.O. Box 286 Woodstock, MD 21163

CRSI Concrete Reinforcing Steel Institute 933 North Plum Grove Road Schamberg, IL 60173-4758

Fed. Spec. Federal Specification/Standard General Services Administration Specifications Branch Room 6039, GSA Building Seventh and D Streets, S.W.

Washington, DC 20407

OSHA Occupational Safety and Health Administration's Standards U.S. Department of Labor Occupational Safety and Health Administration Denver Area Office 333 West Colfax Avenue Denver, CO 80204

PS Product Standards US Department of Commerce Government Printing Office Washington, DC 20402

WCLB Grade Stamps for West Coast Lumber

WWPA Western Wood Products Association 522 SW 5th Avenue, Yeon Bldg Portland, OR 97204-2122

*Federal Specifications and catalogs may be obtained at Business Service Centers of Regional Offices of the General Services Administration. (Washington, DC; Boston, MA;

New York, NY; Philadelphia, PA; Atlanta, GA; Chicago, IL; Kansas City, MO; Fort Worth, TX; Denver, CO; San Francisco, CA; and Auburn, WA.)

GENERAL REQUIREMENTS MT – 010000 – 3

1.3 DEFINITIONS

A. Approvals: Approval of the submittal is an indication that the Contractor's submittal has 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, the Contractor may submit a substitute for approval when the approved item cannot be purchased or delivered in time to avoid delay in completion of the project.

1.4 SUBMITTAL

A. Scope: Submittals may include, but not necessarily be limited to the following: design computations, shop drawings, manufacturers' literature, as-built drawings, samples, and maintenance manuals.

B. Requirements: Refer to specifications for submittal required. Allow at least 5 working days for review. Submittal shall be delivered to the Contracting Officer or his/her appointed representative.

C. Identification of Submittal: 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 re-submittal.

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.

D. Number of copies: Submit two copies of each submittal for approval.

1.5 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 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 conforming 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 form of the Certificate of Conformance provided by the supplier shall be as follows:

GENERAL REQUIREMENTS MT – 010000 – 4

1. The certificate shall state that the named product conforms to the Contract requirements.

2. The certificate shall 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. The certificate shall provide the name and address of the manufacturer, the testing agency, and the date of tests.

4. The certificate shall set forth the means of identification permitting field determination of the product delivered as being the product covered by the certification.

C. Number of copies: Submit two copies of each submittal for approval.

1.6 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 approved manufacturer's diagrams and shop drawings give specific measurements or rough-in dimensions for equipment, these dimensions shall take precedence over dimensions indicated on the drawings.

1.7 DELIVERY, STORAGE, AND HANDLING

A. Delivery: Contractor shall protect work products from damage while in transit to the site.

Products must be delivered in original unopened containers with manufacturer's name and brand designation and contents legibly indicated. The containers shall bear the referenced specification number, type, and class as applicable.

B. Storage: Contractor shall provide temporary storage facilities on site for products complying with manufacturer's recommendations, which will protect them from damage until installation on the project and final acceptance. The storage area shall permit access for inspection and handling.

C. Handling: Contractor shall load and unload products in such a manner that protects them from damage until installation on the project.

GENERAL REQUIREMENTS MT – 010000 – 5

1.8 PROJECT/SITE CONDITIONS

A. Access to the Work: The work site may be accessed by State Highway, County and BLM roads. The area under construction will be closed to the public during construction. Contractor to furnish all necessary permits and construction signage for moving equipment and materials to and from the project site.

B. Lodging: Contractor will be allowed to stay at Axolotl Cabin during the performance time of the Contract (July 20 – Aug. 9).

C. Environmental Considerations: The aesthetic values of the site and surrounding area are of prime importance. The Contractor shall take all care necessary to preserve all plant life and other natural features. Any surface damage shall be corrected by Contractor at his expense.

Any damage to existing State, County or BLM roads used to transport materials to the project, shall also be corrected by Contractor at his expense.

D. Construction facilities:

1. Do not park vehicles or equipment or store materials on private property without written permission from the property owner.

E. Repair of Utilities: Contractor is responsible for any damage to utilities such as, but not necessarily limited to the following: water, electrical, phone, sewer, gas, and main power lines.

All damaged underground or overhead utilities will be the full responsibility of the Contractor and shall be repaired at Contractor’s expense.

1.9 SEQUENCING AND SCHEDULING

A. Work Schedule: Submission of a work schedule is required at the Pre-Work Conference prior to any work being performed. When requested, the Contractor shall submit an updated schedule within 3 calendar days.

B. Submittals and Certificates of Conformance: Submittals and Certificates of Conformance for all materials required shall be submitted at the Pre-Work Conference.

PART 2 - PRODUCTS

(There are no applicable requirements.)

PART 3 - EXECUTION

3.1 PROJECT MEETINGS

A. Pre-Work Conference:

GENERAL REQUIREMENTS MT – 010000 – 6

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

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

3. Presentation: Contractor shall be prepared to summarize and explain procedures planned for the project and present the submittal requested in the specifications.

B. Progress Meetings:

1. Location: Meetings shall be held at the project site or as determined by Contracting Officer.

2. Notification: Meetings may be called by either the Contracting Officer or Contractor.

The request shall state who should attend.

C. Final Inspection:

1. Location: Meeting shall be held at the project site, or as determined by the Contracting Officer.

2. Notification: Contractor shall notify the Contracting Officer, in writing, at least 5 working days prior to the completion date so the Government can schedule final inspection.

3. Attendance: Contractor shall require the superintendent to be present during this inspection.

3.2 CLEANUP

A. Waste Removal: Contractor shall keep the premises free from accumulation of waste materials or rubbish caused by his employees or work. At the completion of the work, Contractor shall remove all such materials from the work site. Any work performed by the Government to return the project site to its pre-construction state will be at the full cost of Contractor.

PART 4 - MEASUREMENT AND PAYMENT

4.1 METHOD OF MEASUREMENT:

A. Units: The work described in the contract drawings and specifications will be paid for on a lump sum basis.

GENERAL REQUIREMENTS MT – 010000 – 7

4.2 BASIS OF PAYMENT:

A. Payment: Payment will be full compensation for the week described in the contract drawings and specifications. Payment will be made under:

Pay Item

MT – 010000 – Structural Reinforcement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lump Sum

END OF SECTION – MT – 010000

SELECTIVE DEMOLITION MT – 017320 – 1

SECTION MT - 017320 - SELECTIVE DEMOLITION

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes the following:

1. Demolition and removal of selected portions of building or structure.

2. Demolition and removal of selected site elements.

3. Salvage of existing items to be reused or recycled.

1.2 DEFINITIONS

A. Remove: Detach items from existing construction and legally dispose of them off-site, unless indicated to be removed and salvaged or removed and reinstalled.

B. Remove and Salvage: Detach items from existing construction and deliver them to Government specified areas.

C. Remove and Reinstall: Detach items from existing construction, prepare them for reuse, and reinstall them where indicated.

D. Existing to Remain: Existing items of construction that are not to be removed and that are not otherwise indicated to be removed, removed and salvaged, or removed and reinstalled.

1.3 SUBMITTALS

A. Schedule of Selective Demolition Activities: Indicate detailed sequence of selective demolition and removal work, with starting and ending dates for each activity.

B. Pre-demolition Photographs: Show existing conditions of adjoining construction and site improvements, including finish surfaces that might be misconstrued as damage caused by selective demolition operations. Submit all photographs to Government before any Work begins. If no pre-demolition photographs are submitted, it will be assumed that all adjoining or adjacent construction areas are in good condition and that any damage noted following the construction process shall become Contractor’s responsibility to repair.

C. Landfill Records: Indicate receipt and acceptance of hazardous wastes by a landfill facility licensed to accept hazardous wastes.

1. Comply with submittal requirements outlined in Section MT – 010000 – General Requirements.

SELECTIVE DEMOLITION MT – 017320 – 2

1.4 QUALITY ASSURANCE

A. Demolition Firm Qualifications: An experienced firm that has specialized in demolition work similar in material and extent to that indicated for this Project.

B. Regulatory Requirements: Comply with governing EPA notification regulations before beginning selective demolition. Comply with hauling and disposal regulations of authorities having jurisdiction.

C. Standards: Comply with ANSI A10.6 and NFPA 241.

D. Pre-demolition Conference: Conduct conference at Axolotl Cabin prior to any demolition work.

1.5 PROJECT CONDITIONS

A. Conditions existing at time of Pre-bid Conference will be maintained by Government as far as practical.

B. Notify Contracting Officer in writing to identify discrepancies between existing conditions and Drawings before proceeding with selective demolition. It is the Contractor’s responsibility to identify all discrepancies before any demolition begins. Any discrepancies not identified shall be corrected at the expense of Contractor in order to ensure a fully functional end product.

C. Hazardous Materials: Contractor is responsible for any unpredictable and/or incidental contact with Hazardous Matrerials. This includes exposure with rodents and their surrounding habitation. Contractor to take preventative measures to protect against Hantavirus before performing any Work. For more information on Hantavirus protective measures, visit http://www.cdc.gov/rodents/cleaning/index.html

D. Utility Service: Maintain all existing utilities and protect them against damage during selective demolition operations.

1.6 WARRANTY

A. Existing Warranties: Remove, replace, patch, and repair materials and surfaces cut or damaged during selective demolition, by methods and with materials so as not to void existing warranties.

PART 2 - PRODUCTS (Not Used)

PART 3 - EXECUTION

3.1 EXAMINATION

A. Verify that an experienced firm is responsible for any relocation or disconnection of utilities in order to complete necessary demolition.

SELECTIVE DEMOLITION MT – 017320 – 3

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

C. Inventory and record the condition of items to be removed and reinstalled and items to be removed and salvaged.

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.

E. Contractor is responsible for properly supporting the structure and floor system at all times and to use the services of a professional structural engineer regarding any temporary reinforcement issues.

F. Perform surveys as the Work progresses to detect hazards resulting from selective demolition activities.

3.2 UTILITY SERVICES AND MECHANICAL/ELECTRICAL SYSTEMS

A. Existing Services/Systems: Maintain services/systems indicated to remain and protect them against damage during selective demolition operations.

B. Service/System Requirements: Locate, identify, disconnect, and seal or cap off indicated utility services and mechanical/electrical systems serving areas to be selectively demolished.

C. Utilities are most likely limited to propane lines and plumbing for this project, however Contractor is responsible for meeting the disconnection and maintenance constraints of all utilities that may be encountered.

3.3 PREPARATION

A. Site Access and Temporary Controls: Conduct selective demolition and debris-removal operations to ensure minimum interference with roads, walkways, and other adjacent occupied and used facilities.

B. 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.

3.4 SELECTIVE DEMOLITION

A. General: Demolish and remove existing construction only to the extent required by new construction and as indicated. Use methods required to complete the Work within limitations of governing regulations and as follows:

1. Neatly cut openings and holes plumb, square, and true to dimensions required. Use cutting methods least likely to damage construction to remain or adjoining construction.

Use hand tools or small power tools designed for sawing or grinding, not hammering and

SELECTIVE DEMOLITION MT – 017320 – 4

chopping, to minimize disturbance of adjacent surfaces. Temporarily cover openings to remain.

2. Cut or drill from the exposed or finished side into concealed surfaces to avoid marring existing finished surfaces.

3. Do not use cutting torches until work area is cleared of flammable materials. At concealed spaces, such as duct and pipe interiors, verify condition and contents of hidden space before starting flame-cutting operations. Maintain portable fire-suppression devices during flame-cutting operations.

4. Locate selective demolition equipment and remove debris and materials so as not to impose excessive loads on structure’s support system.

5. Dispose of demolished items and materials promptly.

B. Reuse of Building Elements: All existing concrete footings shall be reused if found to be in good condition and structural integrity. Contractor shall contact the Contracting Officer regarding any footing or existing support material that may be of questionable quality or structural integrity. It’s the Government’s discretion for the Contractor to repair or replace any unsound materials to be reused. Any repairs or replacement of materials shall be at the Contractor’s expense and should be considered as part of Contractor’s bid.

C. Salvageable items: Salvageable items shall be identified by the Government at the project site, otherwise all removed items to become the property of the Contractor.

D. Any materials to be removed that are not identified to be reused or salvaged, shall become the property of the Contractor.

E. Removed and Reinstalled Items:

1. Clean and repair items to functional condition, adequate for intended reuse.

2. Reinstall items in locations indicated. Comply with installation requirements for new materials and equipment. Provide connections, supports, and miscellaneous materials necessary to make item functional for use indicated.

F. Existing Items to Remain: Protect construction indicated to remain against damage and soiling during selective demolition. When permitted by Contracting Officer, items may be removed to a suitable, protected storage location during selective demolition and reinstalled in their original locations after selective demolition operations are complete.

3.5 DISPOSAL OF DEMOLISHED MATERIALS

A. General: Except for items or materials indicated to be reused, salvaged, reinstalled, or otherwise indicated to remain Government property, remove demolished materials from Project site and legally dispose of them in an EPA-approved landfill.

B. Burning: Do not burn demolished materials.

SELECTIVE DEMOLITION MT – 017320 – 5

C. Disposal: Transport demolished materials off Government property and legally dispose of them.

3.6 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 – MT – 01732

STRUCTURAL CONCRETE MT – 034100 – 1

SECTION MT - 034100 - STRUCTURAL CONCRETE

PART 1 - GENERAL

1.1 SUMMARY

A. Description: Furnishing and placing precast footings, including reinforcing steel, formwork, anchoring, and compaction of the sub-base.

1.2 SUBMITTALS

A. Requirements: Submittals shall be according to MT – 010000 – General Requirements.

B. Manufacturer's Literature: Submit for approval three (3) copies of the manufacturer's descriptive data for the admixtures to be used on this project. Include the brand name, description, mix of concrete (including other admixture), purpose for which the product is used and location in which this concrete shall be placed.

C. Mix Design: Submit for approval three (3) copies of the design mix and strength test results for each strength, class and type of concrete intended to be used on the project. Mix designs and strength test results shall be prepared by a certified testing laboratory.

D. Certificates of Conformance: Submit three (3) copies of the batch certificates for each load of ready-mix delivered to the jobsite or used for precast members, certifying that the batch conforms to the requirements of this specification.

1.3 REFERENCES

A. American Association of State Highway and Transportation Officials (AASHTO)

B. American Concrete Institute (ACI)

C. American Society for Testing and Materials (ASTM)

D. American Welding Society (AWS)

E. Precast/Prestressed Concrete Institute Manual for quality control (PCI MNL)

1.4 QUALITY ASSURANCE

A. Qualifications: Precast concrete work shall be performed by entities that assume responsibility for engineering precast structural concrete to comply with performance requirements.

B. Causes for Rejection: Concrete may be rejected for, but not limited to the following:

STRUCTURAL CONCRETE MT – 034100 – 2

1. Inadequate strength after 28 calendar days as indicated by test cylinders. The Contractor shall be responsible for any additional testing required by the Government to determine the strength of the concrete

2. Inadequate thickness or compaction of footing base.

3. Freezing within first 3 calendar days of placement.

4. Segregation of aggregate or over-vibration resulting in excessive water in the surface of the concrete or lack of water in vertical surfaces.

5. Honeycomb over 25 percent of the surface.

6. Voids larger than 2-inches (50 mm) across.

7. Exposed reinforcing steel.

8. Misalignment of concrete.

9. Substandard aggregate in the mix.

10. Failure to cover or seal concrete during initial 7-day curing period.

11. Improper placement of cut-offs, blockouts, anchor bolts, or other imbedded items.

12. Irregular, cracked, or spalled concrete surfaces.

13. Stained or discolored surfaces.

14. Bond failure for the entire anchor rod length.

1.5 COORDINATION

A. Furnish loose connection hardware and anchorage items to be embedded in or attached to other construction before starting precast work.

B. Contractor shall notify the Government three days prior to any precast work. The time and date of concrete work shall be approved by the Government prior to any Work being performed in order for the Government to make arrangements to be present during the Work.

PART 2 - PRODUCTS

2.1 MATERIALS

A. Cement: ASTM C 150 Portland Cement Type II. The use of caked or hardened cement will not be permitted. Minimum cement content shall exceed 611 pounds per cubic yard (class A concrete).

STRUCTURAL CONCRETE MT – 034100 – 3

B. Water: AASHTO T 26. Water shall be clean and free from harmful amounts of acids, alkalis, and organic materials. Potable water is acceptable without testing. Structural Performance:

Precast structural concrete units and connections shall withstand design loads indicated within limits and under conditions indicated.

C. Aggregate Base Course: The base course for footings shall be a ¾”-minus material with a plasticity index of no greater than 6.

D. Concrete Mix Aggregates:

1. Fine aggregates shall be natural sand in accordance with ASTM C 33, with fineness modulus of not less than 2.5 or more than 3.0.

2. Course aggregates shall be crushed stone or gravel in accordance with ASTM C 33, with maximum size of 3/4 inches.

E. Membrane Curing Compound: ASTM C 309, Type 1 Class A chlorinated 100 percent resin based.

F. Forming:

1. Design and construct formwork for exposed concrete surfaces with plywood, metal framed plywood faced, or other panel-type materials to provide continuous, straight, smooth, as cast surfaces. Furnish formwork in largest practicable lengths to minimize the number of joints. Form material shall be of sufficient thickness to withstand pressure of newly placed concrete without bowing or deflection.

2. Concrete surfaces, which will be unexposed in the finished structure may be formed with plywood, lumber, metal, or other materials acceptable to the Contracting Officer.

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

G. Reinforcing Steel: The placement of reinforcement, including tolerances on depth and cover, shall comply with the provisions of ACI 318, Section 7. Reinforcement shall be accurately placed and adequately supported before concrete is placed. Reinforcing steel shall be of size shown on the drawings and shall meet the requirements of ASTM A 615, Grade 60. Steel reinforcing shall be furnished in full lengths where practicable. Metal chairs shall be galvanized or plastic coated.

H. Reinforcement Supports: Shall be of the size and type required.

I. Adhesive for Sealing Joints: Mastic type adhesive; ASTM D 1850.

J. Admixtures: Other than specified herein, or by reference, admixtures may be used only when approved in writing by the Contracting Officer. When used, comply with the manufacturer's written instructions.

1. Air content by volume: ACI 211.1, paragraph 6.3.3, plus or minus 1 percent. Air entrainment additives: ASTM C 260.

2. Calcium chloride must be approved by the Contracting Officer. Do not use near galvanized materials.

STRUCTURAL CONCRETE MT – 034100 – 4

3. Water reducing or retarding chemical admixtures: ASTM C 494. Used only when specified in the mix design or approved by the Contracting Officer.

4. Pozzolanic or fly ash admixtures: ASTM C 618 and ASTM C 311.

5. Surface hardener: Natural aggregate or iron bearing dry shake material for concrete surface improving and hardening, manufactured for this purpose, containing quartz, trap rock, emery, or granite, and approved in writing by the Contracting Officer.

6. High early strength admixture: A minimum level of strength that is greater than or equal to 80 percent of the 28-day design strength of 4,000 psi must obtained in all concrete work prior to any loadings being placed on the concrete members. A high-early admixture may be necessary to achieve this strength requirement. Early strength admixture shall comply with ASTM C387.

K. Control Joints: Non-staining wood, plastic, or metal formed to be removed without spalling concrete.

2.2 MIXES

A. Concrete Design Mix: Design the mix to provide concrete, including specified admixtures and cement, with the following properties using material the Contractor proposes to use on the project:

1. Concrete shall be 4,000 psi, 28-day compressive strength, with a 7-day compressive strength of 80% (3200 psi). The water cement ratio shall not exceed 5 gallons per sack of cement, inclusive of water in the aggregate. The proportions of aggregate to cement shall produce concrete with a slump of 2 to 4 inches according to ASTM C 143.

2. Air content shall be 4 to 6 percent at the point of placement.

3. Ready mixed concrete that meets the above specifications will be permitted when approved in writing by the Contracting Officer. The Contracting Officer will have access to the mixing plant during concrete mixing operations.

2.3 STEEL CONNECTION MATERIALS

A. Foundation Plates: Foundation plates shall be bolted or anchored to the column footings and shall be placed appropriately to ensure uniform loading to be transferred as designed through the support structure.

1. Footings to Steel Shore Base Connections: Base plates connecting steel shores to concrete footings shall have a minimum dimension of 1/2” x 8” x 8”. Connection bolts shall be no less than 1/8” smaller than the bolt hole diameter of the base plate.

2. Precast footing Anchorage: Precast footings shall include cast-in-place, ½” anchor bolts with a 4” embedment. Anchor bolt pattern shall reflect connection holes of column support base plates to be mounted to footing.

STRUCTURAL CONCRETE MT – 034100 – 5

3. Connection Bolts: All connection bolts shall have a zinc coated finish using hot-dip process according to ASTM A 123.

2.4 FABRICATION

A. Cast-in Anchors, Inserts, Plates, Angles, and Other Anchorage Hardware: Fabricate anchorage hardware with sufficient anchorage and embedment to comply with design requirements.

Accurately position for attachment of loose hardware, and secure in place during precasting operations. Locate anchorage hardware where it does not affect position of main reinforcement or concrete placement.

B. Furnish loose hardware items including steel plates, clip angles, seat angles, anchors, dowels, cramps, hangers, and other hardware shapes for securing precast structural concrete units to supporting and adjacent construction.

C. Cast-in reglets, slots, holes, and other accessories in precast structural concrete units as indicated on the Contract Drawings.

D. Reinforce precast structural concrete units to resist handling, transportation, and erection stresses and specified in-place loads.

E. Place concrete in a continuous operation to prevent cold joints or planes of weakness from forming in precast concrete units.

F. Thoroughly consolidate placed concrete by vibration without dislocating or damaging reinforcement and built-in items, and minimize pour lines, honeycombing, or entrapped air voids on surfaces. Use equipment and procedures complying with PCI MNL 116.

G. Comply with PCI MNL 116 procedures for hot- and cold-weather concrete placement.

H. Identify pickup points of precast structural concrete units and orientation in structure with permanent markings, complying with markings indicated on Shop Drawings. Imprint or permanently mark casting date on each precast structural concrete unit on a surface that does not show in finished structure.

I. Cure concrete, according to requirements in PCI MNL 116, by moisture retention without heat or by accelerated heat curing using live steam or radiant heat and moisture. Cure units until compressive strength is high enough to ensure that stripping does not have an effect on performance or appearance of final product.

J. Discard and replace precast structural concrete units that do not comply with requirements, including structural, manufacturing tolerance, and appearance, unless repairs meet requirements in PCI MNL 116 and meet Engineer’s approval.

K. It is the Contractor’s responsibility to account for extra precast footings that may be necessary due to unforeseen damage to either the existing or precast footings during the construction process.

STRUCTURAL CONCRETE MT – 034100 – 6

2.5 SOURCE QUALITY CONTROL

A. Testing: Contractor is responsible – financial or otherwise – for testing the required air content and slump tests, as well as compression tests of 6 cylinders per individual batch of concrete.

Results will be recorded and distributed to the Government as soon as made available. Testing shall be conducted by a certified, independent testing laboratory.

PART 3 - EXECUTION

3.1 INTALLATION:

A. Base Preparation: Aggregate material forming the base shall be placed and compacted to a minimum density of 95 percent of the maximum dry density as determined by AASHTO T99, method C.

B. Form Construction: Construct forms according to ACI 347, Chapters 1 through 4, to the exact sizes, shapes, lines, and dimensions shown, and as required to obtain accurate alignment, location, grades, and level and plumb work in finished structures. Provide required detail work, construction aids, and embedded items. Use selected materials to obtain required finishes.

Fabricate forms for easy removal without hammering or prying against concrete surfaces.

C. Form Removal: Form oil may be applied to facilitate removal of forms. Formwork not supporting concrete, such as sides of walls and similar parts of the work, may be removed after curing at not less than 50 degrees Fahrenheit for 24 hours after placing concrete, when the concrete is sufficiently hard so as not to be damaged by form removal, and when curing and protection operations are maintained as specified.

D. Install clips, hangers, bearing pads, and other accessories required for connecting precast structural concrete units to supporting members and backup materials.

E. Erect precast structural concrete level, plumb, and square within specified allowable tolerances.

Provide temporary structural framing, shoring, and bracing as required to maintain position, stability, and alignment of units until permanent connections are complete.

F. Connect precast structural concrete units in position by bolting, welding, grouting, or as otherwise indicated on Shop Drawings. Remove temporary shims, wedges, and spacers as soon as practical after connecting and grouting are completed.

G. Existing cast-in-place footings shall be fastened to base plates of the steel shores using a drop-in, shell type anchorage system that utilizes a bolt diameter of ½” and a minimum embedment of 4 inches, unless otherwise approved by the Government. All connecting materials shall conform to design provision set forth by ACI 318. A.

H. Field cutting of precast units is not permitted without approval of Contracting Officer.

I. Fasteners: Do not use drilled or powder-actuated fasteners for attaching accessory items to precast concrete units.

STRUCTURAL CONCRETE MT – 034100 – 7

J. Welding: Comply with applicable requirements in AWS D1.1/D1.1M and AWS D1.4/D1.4M for welding, welding electrodes, appearance, quality of welds, and methods used in correcting welding work.

K. At bolted connections, use lock washers, tack welding, or other approved means to prevent loosening of nuts after final adjustment.

L. Foundation Repair: All foundation cracks shall be repaired to a state that allows for protection from further degradation and ensures design strength of the foundation to be maintained. Epoxy Adhesives used for repair work shall conform to the strength requirements of Hilti CI 060 EP/070 EP Crack Injection System, or approved equal. The installation procedure shall follow the manufacturer’s requirements.

3.2 CURING

A. Precast concrete shall cure for a minimum of seven (7) days prior to placement. No loadings shall be placed on the concrete footings until an 80 percent design load is achieved.

B. Curing of all other products shall adhere to manufacturer’s minimum cure time.

3.3 PROTECTION

A. Damaged or Defective Concrete:

1. Precast concrete that has been damaged by any cause will be rejected and subsequently not used.

2. Any existing concrete that shows damage – prior or during construction activities – shall be repaired or removed and replaced by Contractor with acceptable concrete at no additional cost to the Government. It is the Contractor’s responsibility to account for any extra precast footings that may be needed.

3.4 FIELD QUALITY CONTROL

A. Special Inspections: The Government shall be notified at least three (3) days prior to any pre-cast concrete pours in order to be on site and verify the presence of a qualified testing agency representative. The Government will also be present to confirm proper reinforcement and acceptable formwork clearances.

B. Contractor shall visually inspect any field welds and test according to ASTM E 165 or to ASTM E 709 and ASTM E 1444. High-strength bolted connections are subject to inspections.

C. Testing agency will report test results promptly and in writing to Contracting Officer.

D. Repair or remove and replace work where tests and inspections indicate that it does not comply with specified requirements.

STRUCTURAL CONCRETE MT – 034100 – 8

E. Additional testing and inspecting, at Contractor's expense, shall be performed to determine compliance of replaced or additional work with specified requirements.

F. Prepare test and inspection reports and submit to the Contracting Officer.

3.5 REPAIRS

A. Repair existing cast-in-place structural concrete units if permitted by Contracting Officer.

1. Repairs may be permitted if structural adequacy, serviceability, durability, and appearance of units have not been impaired. If serviceability of cast-in-place structural concrete is beyond repair, Contractor shall replace the concrete structure in order to ensure fully functioning member.

B. Mix patching materials and repair units so cured patches blend with color, texture, and uniformity of adjacent exposed surfaces and show no apparent line of demarcation between original and repaired work.

C. Prepare and repair damaged galvanized coatings with galvanizing repair paint according to

ASTM A 780/A 780M.

D. Remove and replace damaged precast structural concrete units that cannot be repaired or when repairs do not comply with requirements as determined by Contracting Officer.

3.6 CLEANING AND SURFACE PREPARATION

A. Clean exposed surfaces of precast concrete units after erection and completion of joint treatment to remove weld marks, other markings, dirt, and stains.

1. Perform cleaning procedures, if necessary, according to precast concrete fabricator's written recommendations. Protect other work from staining or damage due to cleaning operations.

2. Do not use cleaning materials or processes that could change the appearance of exposed concrete finishes or damage adjacent materials.

B. Existing concrete footings and foundation shall be clean, as well as made level and uniformly smooth to ensure proper surface area connection between support columns and concrete surface.

END OF SECTION MT - 034100

AXOLOTL CABIN – STRUCTURAL REINFORCEMENT

ROUGH CARPENTRY AND STRUCTURAL REINFORCEMENT MT-061053 - 1

SECTION MT - 061053 - ROUGH CARPENTRY AND STRUCTURAL REINFORCEMENT

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Framing with dimension lumber.

2. Wood blocking and nailers.

3. Timber beams and columns.

4. Adjustable locking steal shore columns.

1.2 REFERENCE

A. ALSC: American Lumber Standard Committee.

B. ASTM: American Society for Testing and Materials.

C. AWPA: American Wood Protection Association.

D. NeLMA: Northeastern Lumber Manufacturers' Association.

E. DOC PS 20: ALSC, Product Standard edition 20

F. NHLA: National Hardwood Lumber Association.

G. NLGA: National Lumber Grades Authority.

H. SPIB: Southern Pine Inspection Bureau (The).

I. WCLIB: West Coast Lumber Inspection Bureau.

J. WWPA: Western Wood Products Association

1.3 SUBMITTALS

A. Requirements: The Contractor shall submit the Manufacturer’s Certificate of Compliance for materials. Submittals shall be in accordance with MT – 010000 – General Requirements.

B. Product Data: Provide technical data, as well as application and installation instruction for the following materials:

ROUGH CARPENTRY AND STRUCTURAL REINFORCEMENT MT-061053 - 2

1. Preservative-treated wood.

2. Power-driven fasteners.

3. Wood adhesive products.

4. Load Bearing Steel Shores.

1.4 DELIVERY, STORAGE, AND HANDLING

A. Schedule delivery of materials to avoid extended on-site storage and to avoid delaying the Work.

B. Store materials under cover and protected from weather and contact with damp or wet surfaces.

Support stacked products to prevent deformation and to allow for air circulation within and around temporary coverings.

PART 2 - PRODUCTS

2.1 WOOD PRODUCTS, GENERAL

A. Lumber: DOC PS 20 and applicable rules of grading agencies indicated. If no grading agency is indicated, provide lumber that complies with the applicable rules of any rules-writing agency certified by the ALSC Board of Review. Provide lumber graded by an agency certified by the ALSC Board of Review to inspect and grade lumber under the rules indicated.

1. Factory mark each piece of lumber with grade stamp of grading agency.

2. Dress lumber, S4S, unless otherwise indicated.

B. Maximum Moisture Content of Lumber: 19 percent unless otherwise indicated.

2.2 WOOD-PRESERVATIVE-TREATED MATERIALS

A. Preservative Treatment by Pressure Process: AWPA U1.

1. Preservative Chemicals: Acceptable to authorities having jurisdiction and containing no arsenic or chromium.

B. Kiln-dry lumber after treatment to a maximum moisture content of 19 percent. Do not use material that is warped or does not comply with requirements for untreated material.

C. Mark lumber with treatment quality mark of an inspection agency approved by the ALSC Board of Review.

D. Application: Treat items indicated on Drawings, and the following:

ROUGH CARPENTRY AND STRUCTURAL REINFORCEMENT MT-061053 - 3

1. Wood cants, nailers, curbs, equipment support bases, blocking, stripping, and similar members in connection with roofing, flashing, vapor barriers, and waterproofing.

2. Wood sills, sleepers, blocking and similar concealed members in contact with masonry or concrete.

3. Wood framing and furring attached directly to the interior of below-grade exterior masonry or concrete walls.

4. Wood framing members that are less than 18 inches above the ground in crawlspaces or unexcavated areas.

5. Wood floor plates that are installed over concrete slabs-on-grade.

2.3 DIMENSION LUMBER AND HEAVY TIMBER

A. Joists and Blocking:

1. Species: Hem-Fir

2. Grade: No. 1

B. Load Bearing Girders:

1. Species: Douglas Fir-Larch

2. Grade: Select Structural. Grain: all logs shall be straight grain. Spiral grain logs greater than ¼” spiral in 12 inches, shall not be used.

3. Length: Girders shall be of one continuous length unless otherwise approved by

Government prior to construction.

4. Any spliced members shall be reinforced by steel plating and must be approved by a professional structural engineer to be of greater than or equal strength as compared to an equivalent member of a single continuous length.

2.4 Load Bearing Steel Shores: Shall feature an easily adjustable design with permanent locking capabilities. Ellis Manufacturing LIGHT DUTY adjustable steal shores with thrust bearing nut and locking mechanism, or approved equal (custom base and top plate may be necessary in order to meet design).

A. Load Capacity: Structural support to have a minimum load capacity of 12 kips.

B. Length: Structural supports shall be adjustable to fit between overhead support beams and concrete footings identified in the contract drawings.

C. Permanent Support: Structural support shall have locking mechanism to allow for permanent placement and use.

ROUGH CARPENTRY AND STRUCTURAL REINFORCEMENT MT-061053 - 4

D. Connection plate Dimensions: Top plate shall be 3/8” x 6” x 6”. Bottom plate shall be 1/2” x 8” x 8”. Minimum bolt hole diameter of 5/8” to allow for minimum bolt size specified in this article.

2.5 FASTENERS

A. General: Provide fasteners of size and type indicated that comply with requirements specified in this article for material and manufacture.

1. Where carpentry is exposed to weather, in ground contact, pressure-preservative treated, or in area of high relative humidity, provide fasteners with hot-dip zinc coating complying with ASTM A 153/A 153M.

B. Screws for Fastening to Metal Framing: ASTM C 1002, length as recommended by screw manufacturer for material being fastened.

C. Power-Driven Fasteners: Fastener systems with an evaluation report acceptable to authorities having jurisdiction, based on ICC-ES AC70.

D. Ledger Board Connections: All joists and blocking shall be tied to foundation ledger board where shown in the drawings. Connections to foundation ledger board shall be made using light-gage steel connection plates and manufacturer’s recommended fasteners.

2.6 MISCELLANEOUS MATERIALS

A. Adhesives for sistering joists shall conform to a minimum service temperature range of -20° to 140° F, and must have a 7-day shear strength of at least 500 psi. Extreme Heavy Duty Liquid Nails adhesive or approved equal.

PART 3 - EXECUTION

3.1 INSTALLATION, GENERAL

A. Framing Standard: Comply with AF&PA's WCD 1, "Details for Conventional Wood Frame Construction," unless otherwise indicated.

B. Set carpentry to required levels and lines, with members plumb, true to line, cut, and fitted. Fit carpentry accurately to other construction. Locate nailers, blocking, and similar supports to comply with requirements for attaching other construction.

C. Do not splice structural members between supports unless otherwise indicated.

D. Comply with AWPA M4 for applying field treatment to cut surfaces of preservative-treated lumber.

ROUGH CARPENTRY AND STRUCTURAL REINFORCEMENT MT-061053 - 5

E. Securely attach carpentry work to substrate by anchoring and fastening as indicated by Contract Drawings and Specifications. Any anchors and fasteners not expressly identified by Contract Drawings and Specifications, shall conform to the following:

1. Table 2304.9.1, "Fastening Schedule," in ICC's International Building Code.

2. Table R602.3(1), "Fastener Schedule for Structural Members," and Table R602.3(2), "Alternate Attachments," in ICC's International Residential Code for One- and Two- Family Dwellings.

3. ICC-ES evaluation report for fastener.

3.2 PROTECTION

A. Protect wood that has been treated with inorganic boron (SBX) from weather. If, despite protection, inorganic boron-treated wood becomes wet, apply EPA-registered borate treatment.

Apply borate solution by spraying to comply with EPA-registered label.

END OF SECTION – MT – 061053