1_PPNM_Riverbank_Sidewalk_-_Specifications.pdf

Technical Specifications for

2022 PPNM RIVERBANK SIDEWALK

BUREAU OF LAND MANAGEMENT

5001 Southgate Dr

Billings, Montana 59101

APRIL 2022

TABLE OF CONTENTS

TABLE OF CONTENTS

CONTRACT SPECIFICATIONS PAGES

MT-01009 General Information and Requirements.........1 of 5

MT-01505 Mobilization.................................1 of 1

MT-02213 Site Grading.................................1 of 5

MT-02233 Crushed Aggregate Base.......................1 of 3

MT-02910 Reclamation..................................1 of 2

MT-03306 Minor Concrete ..............................1 of 5

CONTRACT DRAWINGS

Cover Sheet...........................................1 of 4

Project Maps..........................................2 of 4

Sidewalk Plan.........................................3 of 4

Sidewalk Details......................................4 of 4

SECTION MT-01009

GENERAL INFORMATION AND REQUIREMENTS

GENERAL INFORMATION AND REQUIREMENTS

2022 PPNM RIVERBANK SIDEWALK

MT-01009-1

PART 1: GENERAL

1.1 SUMMARY:

A. Description of Work: Furnishing labor, equipment, supplies, and materials to INSTALL concrete pavement at the Bureau of Land Management (BLM)

Pompeys Pillar National Monument (PPNM) (location shown on Drawings).

Work includes, site grading, constructing base materials, and installing concrete in accordance with these drawings and specifications.

B. Location: Work under this Contract is located at Pompeys Pillar National Monument. Pompeys Pillar National Monument is located approximately 1 mile Northwest of I-94 Exit 23 off Hwy 312. The work location is shown on the drawings.

C. Work Schedule: Work to begin after Notice to Proceed.

D. Work Area: Work area is located at the BLM Pompeys Pillar National

Monument site. During the time of construction, the construction area will be closed to the public. The contractor is responsible for all necessary temporary barriers and signage to secure the work area and ensure the safety of the public using the site.

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

ASTM American Society for Testing and Materials

1916 Race Street

Philadelphia, PA 19103

Fed. Spec. Federal Specification/Standard

General Services Administration

Specifications Branch

Room 6039, GSA Building

Seventh and D Streets, S.W.

Washington, DC 20407

MT-01009-2

MDT Standard Specifications for Road and Bridge Construction, 1995 Ed

Montana Department of Transportation

Contract Plans Section

2701 Prospect Avenue

Helena, MT, 59620

MPW Montana Public Works Standard Specifications

1717 11th Ave.

PO Box 4519

Helena, MT 59604

MUTCD Manual on Uniform Traffic Control Devices for Streets and

Highways

Superintendent of Documents

Government Printing Office

Washington, DC 20402

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

*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.)

1.3 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, 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: Submittal shall be based on the requirements listed in these contract sections.

B. Requirements: For required submittals, allow at least 3 working days for review. Submittal shall be delivered to the Contracting Officer’s

Representative for review.

MT-01009-3

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 note the manufacturer's name and address.

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: Measurement for pavement is based on the area measured on site and material lift tickets. See pay item details for described units.

1.6 DELIVERY, STORAGE, AND HANDLING:

A. Delivery: The Contractor shall 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 and brand designation and contents legibly indicated. The containers shall bear the referenced specification number, type, and class as applicable.

B. Storage: The Contractor shall provide temporary storage facilities 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: The Contractor shall load and unload products in such a manner that protects them from damage until installation on the project.

1.7 PROJECT/SITE CONDITIONS:

A. Access to the Work: The work site access is provided by State and County

Road systems, as well as shown in the Drawings.

B. 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 outside the staked area shall be corrected by the

Contractor at his expense. Any damage to existing State, County, or local

MT-01009-4

roads, used to transport materials to the project, shall be corrected by the Contractor at his expense.

C. Construction facilities: Do not park vehicles or equipment or store materials on private property without written permission from the property owner. Bureau of Land Management will permit a staging area located adjacent to the work location (Parking Area shown on drawings).

1.8 SEQUENCING AND SCHEDULING:

A. Work Schedule: The schedule shall be submitted at the pre-work conference. When requested, the Contractor shall submit an updated schedule within 3 calendar days.

PART 2: PRODUCTS

(There are no applicable requirements.)

PART 3: EXECUTION

3.1 PROJECT MEETINGS:

A. Pre-Work Conference:

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 will be to review required work, project drawings and specifications, submittals, construction schedules, payroll and payments, and administrative provisions of the Contract.

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

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

B. Progress Meetings:

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

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

Officer or the 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: The Contractor shall notify the Contracting Officer, in writing, at least 5 working days before the completion date so the

Government can schedule final inspection.

MT-01009-5

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

3.2 CLEANUP:

A. Waste Removal: The Contractor shall at all times keep the premises free from accumulation of waste materials or rubbish caused by his employees or work. At the completion of the work, the Contractor shall remove all such materials from the work site. Excess concrete shall be removed from the project site.

PART 4: MEASUREMENT AND PAYMENT

4.1 METHOD OF MEASUREMENT:

A. Units: The work described in this section will not be measured for payment.

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.

END OF SECTION

SECTION MT-01505

MOBILIZATION

MOBILIZATION

MT-01505-1

PART 1: GENERAL

1.1 SUMMARY:

A. Section Includes: Preparatory work and operations, including those necessary to the movement of personnel, equipment, supplies and incidentals to the project site; and for other work and operations which must be performed or costs incurred prior to beginning work on the various items on the project site.

4.01 METHOD OF MEASUREMENT:

A. Units: Progress payments will be made as follows:

1. When 5 percent of the original contract amount is earned from other bid items, 50 percent of the amount bid for mobilization or 5 percent of the original contract amount, whichever is lesser, will be paid.

2. When 10 percent of the original contract amount is earned from other bid items, 100 percent of the amount bid for mobilization or 10 percent of the original contract amount, whichever is lesser, will be paid.

3. Upon completion of work for the project, payment of the amount bid for mobilization in excess of 10 percent of the original contract amount, will be paid.

4. The total sum of all payments shall not exceed the original contract amount bid for mobilization, regardless of the fact that the contractor may have shut down the work on the project or moved equipment away from the project and then back again.

4.02 BASIS OF PAYMENT:

A. Payment: Prices and payment will be full compensation for the work described in this section. No modification and adjustments shall be allowed for costs and changes to mobilization despite changes in fuel or transportation costs. Payment will be made under:

Pay Item Pay Unit

MT-01505(1) Mobilization . . . . . . . . . . . . . . . . . . . . . Lump Sum

SECTION MT-02213

SITE GRADING

MT-02213-1

A. Section Includes: All Earthwork required to complete the subgrade sections of the project including clearing and grubbing, excavation, embankment, grading, dig-out, and compacting related work to prepare and restore the site as indicated and as shown on the drawings.

1.2 REFERENCES:

A. American Association of State Highway and Transportation Officials

AASHTO T 99-86 Moisture-Density Relations of Soils Using a 5.5-lb (2.5

kg) Rammer and a 12-inch (305 mm) Drop

AASHTO T 239-86 Moisture Content of Soil and Soil-Aggregate in Place by

Nuclear Methods (Shallow Depth)

1.3 DEFINITIONS:

A. Site Grading: All Earthwork required to complete subgrade sections of the

New Sidewalk Alignment.

B. Excavation: All excavation materials shall be considered as unclassified excavation, regardless of its nature.

C. Embankment: Shall be mineral soil, free from peat, frozen material, brush, trees, roots over 2 inches in diameter, and rocks over 6 inches in greatest diameter, and be obtained from on-site during excavation.

Embankment is that material placed beneath concrete on the site and is noted in the contract drawings as Native Material.

D. Topsoil: Shall be organic soil (identified by the Contracting Officer

Representative) excavated from the adjusted sidewalk alignment. Topsoil shall be stockpiled for use on the reclamation of the old sidewalk alignment. Topsoil shall be placed in accordance with these contract specifications and drawings.

E. Waste Excavation: Excavation that is not used for construction of embankments or classified as Top-soil, will be retained by the Government on site at an identified location within 400 linear yards of the project construction boundary.

1.4 QUALITY ASSURANCE:

A. Failure Criteria: Not limited to the following:

MT-02213-2

1. Formation of pools of moisture where positive drainage is indicated on the drawing.

2. Settlement of embankment.

1.5 PROJECT/SITE CONDITIONS:

A. Excess Material:

1. Top-soil material excavated shall be stockpiled as shown in the drawings. Excess material will be retained by the Government on site at an identified location within 400 linear yards of the project construction boundary.

2. All oversized rocks removed below subgrade elevations shall be brought back to the original subgrade elevation using excavated material before the use of 3/4 inch Crushed Aggregate Base.

B. Elevations: Verify the grade elevations existing on the site. Notify the Contracting Officer immediately if adjustments are required to provide finish elevations indicated or compliance with the Architectural

Barriers Act (ABA). Site drainage shall be considered of prime importance.

C. Environmental Conditions: Do not attempt to grade saturated material.

Water dry material to prevent dust.

2.1 MATERIALS:

A. General: See definitions.

3.1 CLEARING AND GRUBBING:

A. Requirements: The area to be excavated shall be thoroughly cleared and stripped of objectionable vegetative matter, brush, trees, stumps, roots, and rocks and shall be removed and disposed of offsite by the Contractor at their expense.

3.2 SCARIFYING:

A. Requirements: Sod and vegetation shall be removed from the surface upon which the fill shall be placed, and the cleared surface shall be completely broken up by scarifying to a minimum depth of 6 inches.

Scarifying furrows shall be a maximum of 3 feet apart and shall be parallel to the center line of the fill. No embankment materials shall be

MT-02213-3

placed until the surface upon which the embankment material shall be placed has been approved.

3.3 PREWATERING:

A. Requirements: Excavation areas may be prewatered before excavating the material. The area to be excavated shall be moistened to the full depth from the surface to the bottom of the excavation. The application of water shall be controlled so that the excavated material will be near the optimum moisture content as specified in paragraph 3.7 A below. When necessary, prewatering shall be supplemented to assure that embankment material and backfill material moisture content comply with paragraph 3.7

A below.

3.4 EXCAVATION:

A. Requirements: Excavation shall be performed in a manner that allows the

Contractor to sort the three excavation classifications Topsoil, Embankment, and Waste. Excess excavation shall be stockpiled.

3.5 INSTALLATION:

A. Topsoil: Excavated and stockpiled.

B. Grades: Grades not otherwise indicated shall be level, or uniform slopes between points where elevations are given, or between such points and existing finished grades. Abrupt change in slopes shall be rounded.

C. Earthfill Placement: Embankment materials used to construct the new sidewalk alignment shall be spread over the full width of the cross section of the embankment to a maximum loose thickness of 6 inches and shall be compacted as specified in paragraph 3.7 A and B before the next layer is spread. The Contractor shall use compaction equipment suitable to the type and depth of material being compacted 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.

D. Disposal of Materials: Excess excavation (Waste Excavation) shall be stockpiled on site at an identified location within 400 linear yards of the project construction boundary.

E. Use of Subbase Borrow Material: Do not use subbase imported borrow material until after the materials obtained from the required excavation have been placed in the fill, unless otherwise directed by the

Contracting Officer in the field.

3.6 FINISHING:

MT-02213-4

A. The new sidewalk alignment subgrade shall be finished with equipment capable of shaping and grading the finished surface within the tolerance specified below.

1. The surface will be checked for the required grades by the

Contracting Officer with tolerances being ± 5 hundredths of a foot.

3.7 FIELD QUALITY CONTROL:

A. Moisture Content: During watering and compacting of the embankment subgrade, the optimum moisture content (-4 percent to +2 percent), as determined by AASHTO T 99 and AASHTO T 239, shall be maintained by wetting or drying. The government will perform tests as needed to ensure compliance with this requirement.

B. Compaction: The embankment subgrade, and all crushed aggregate base course materials, shall be compacted to a minimum density of 95 percent of the maximum dry density obtained by AASHTO T 99. The government will perform tests as needed to ensure compliance with this requirement.

A. Units:

1. Include all materials, labor, equipment and supplies needed to perform all earthwork required to complete subgrade sections of the new sidewalk alignment including clearing and grubbing, excess material and stockpiling, excavation, embankment, backfill, and borrow if needed. The work described in this section will be measured and paid for on a lump sum basis for Site Grading.

2. Crushed Aggregate Materials installed will be paid for under Section

MT-02233.

described in this section. Payment will be made under:

MT-02213(1) Site Grading . . . . . . . . . . . . . . . . . . . . Lump Sum

MT-02213(2) Trail Reclamation . . . . . . . . . . . . . . . . . .Lump Sum

SECTION MT-02233

CRUSHED AGGREGATE BASE

MT-02233-1

A. Section Includes: This work shall include furnishing, placing, and compacting aggregate base course materials on the prepared subgrade of the BLM Pompeys Pillar National Monument new sidewalk alignment to these specifications and to the lines, grades, and thickness as shown on the drawings or as staked in the field.

1.2 REFERENCES

A. American Association of State Highway and Transportation Officials:

AASHTO T 99-86 Moisture-Density Relationship of Soils Using a 5.5-lb

(2.5 kg) Rammer and a 12-inch (305 mm) Drop

AASHTO T 239-86 Moisture Content of Soil and Soil-Aggregate in Place by

Nuclear Methods (Shallow Depth)

1.3 CERTIFICATE OF CONFORMANCE:

A. Certification: Contractor to submit written certification from the supplier that the Contractor-furnished material to be used on this project conforms to the requirements of this specification section.

Contractor shall include in the submittal, test results from a Certified

Geotechnical Laboratory: Samples shall be obtained from the stockpile of material to be used on this project at the time of Construction for the

Crushed Aggregate Base.

1. Sieve Analysis according to AASHTO T 99.

2. Standard Proctor according to AASHTO T 99.

3. Atterburg limits according to ASTM D 4318

4. Percentage of Mechanically Fractured Particles according to Montana

Department of Transportation (MDT), MT-217.

2.1 MATERIALS: Shall be in conformance with the following requirements:

A. General: Aggregate material shall consist of hard, durable particles or fragments of slag, stone, or gravel crushed of the required size and grading. Shall be visually free from organic matter and lumps or balls of clay and shall meet the requirements for the grading given.

MT-02233-2

B. Crushed Aggregate Base: Shall meet the following gradation and requirements including added binder or blending material:

Sieve Size Percent Passing

1 inch 100 percent

No. 4 30-60 percent

No. 10 25-55 percent

No. 200 4-20 percent

1. The Maximum liquid limit for the material passing the No. 40 sieve is

35.

2. The Plasticity Index for the material passing the No. 40 sieve may vary between 0 and 6.

3. At least 35 percent by weight of the aggregate retained on the No. 4 sieve must have at least one mechanically-fractured face. Test for determining percentage of mechanically fractured particles shall be according to MDT, MT-217.

3.1 PREPARATION:

A. The subgrade shall be prepared in accordance with Section MT-02213 - Site

Grading.

3.2 INSTALLATION:

A. All aggregate material shall be placed and spread either on the prepared subgrade or prepared subbase in a uniform layer not exceeding 6 inches in compacted depth. The method of dumping and spreading shall be determined by the Contractor. The spread material shall be free of segregation.

3.3 COMPACTION:

A. Each layer of aggregate base shall be compacted to the full width by means of compaction equipment suitable to the type and depth of material being compacted. Compaction of each layer shall continue until density of not less than 95 percent of the maximum dry density determined in accordance with AASHTO T 99, or other approved method, has been achieved.

The government will perform moisture-density tests as needed to ensure compliance with this requirement.

3.4 FINISHING:

A. The final layer of each aggregate base course material shall be finished with equipment capable of shaping and grading the finished surface within the tolerance specified below.

MT-02233-3

1. The surface will be checked for the required grades specified on the drawings by the Contracting Officer with tolerances being ±

3-hundredths of a foot.

1. Crushed Aggregate Base: The work described in this section for this item will be measured and paid for by the ton compacted in place.

Determination of quantities shall be as follows:

a. Loose Material hauled shall be weighed at a certified scale and tickets given to the Contracting Officer Representative.

A. Payment: The accepted quantities will be paid for at the Contract price per unit of measurement, respectively, for the pay item shown in the Bid

Schedule. Price and payment shall be full compensation for furnishing and placing all materials, including all labor, equipment, tools, and incidentals necessary to complete the work described in this section.

Payment will be made under:

Payment Pay Unit

MT-02233(1) Crushed Aggregate Base . . . . . . . . . . . . . . . . . . Ton

End of Section

SECTION MT-02910

RECLAMATION

MT-02910-1

A. Section Includes: All stripping, stockpiling, spreading, grading of topsoil. All preparation for seeding and seeding of restoration areas.

2.1 TOPSOIL:

A. Excavation of Topsoil: Strip topsoil from within the limits of disturbance to a depth of 6 inches. Remove all construction debris.

2.2 SEED MIXTURE:

A. There shall be no primary or secondary noxious weed seed in the seed mixture. Seed shall be tested, and the viability testing of seed shall be done in accordance with State law(s) and within six months prior to purchase. Commercial seed shall be either certified or registered seed.

The seed mixture container shall be tagged in accordance with State law(s) and available for inspection by the Contracting Officer Representative.

Seed shall be planted using a drill equipped with a depth regulator to ensure proper depth of planting where drilling is possible. The seed mixture shall be evenly and uniformly planted over the disturbed area.

Smaller/heavier seeds have a tendency to drop to the bottom of the drill and are planted first. The holder shall take appropriate measures to insure this does not occur. Where drilling is not possible, seed shall be broadcast, and the area shall be raked or chained to cover the seed. When broadcasting the seed, the pounds per acre noted below are to be doubled.

The seeding will be repeated until a satisfactory stand is established as determined by the Contracting Officer. Evaluation of growth will not be made before completion of the second growing season after seeding.

Bureau of Land Management Approved Seed Mix

Common Name Scientific Name

Percent of Total

Mix

Pounds

PLS/acre

Bluebunch wheatgrass Pseudoroegneria spicata up to 20% 5

Needle-and-thread Hesperostipa comata up to 20% 2

Prairie junegrass Koeleria macrantha up to 10% 1

Sandberg’s bluegrass Poa secunda up to 10% 1

Milkvetch spp Astragalus spp up to 10% 1

Purple prairie Clover Dalea purpurea up to 10% 1

Western wheatgrass Pascopyrum smithii up to 20% 4

MT-02910-2

3.1 STRIPPING:

A. Requirements: Strip and stockpile all areas to be excavated for borrow and waste areas and all areas that are to receive fill.

3.2 PLACING TOPSOIL:

A. Requirements: Do not spread topsoil when the ground is frozen, excessively wet. Lightly scarify designated surfaces prior to the spreading operation. Place 6 inches of topsoil over all areas disturbed.

After placement is completed, finish the topsoil surface to a uniform surface.

3.3 SEEDING:

A. Requirements: Drill or rake in all grass seed at time of completion of areas or project.

3.4 CLEANUP OF AREA:

A. Requirements: Upon completion of the project, clear the entire project site of all debris. Finish ground surfaces to smooth, uniform slopes and present in a neat appearance. Repair any utilities, structures, landscaping, grass areas, etc. that are damaged by the Contractor, at the Contractor’s expense.

1. Include all materials, labor, equipment and supplies needed to perform all reclamation required to complete stripping, stockpiling, placement of topsoil, seeding and cleanup. The work described in this section will be measured and paid for on a lump sum basis for Reclamation.

MT-02910(1) Reclamation . . . . . . . . . . . . . . . . . . . . . Lump Sum

MINOR CONCRETE

MT-03306-1

SECTION MT-03306

A. Section Includes: Furnishing and Placing, cast-in-place concrete.

B. Related Sections

General Information and Requirements Section MT-01009

Site Grading Section MT-02213

Crushed Aggregate Base Section MT-02233

1.2 SUBMITTALS:

A. General: Submittals shall be according to Section MT-01009 - General

Information and Requirements.

B. Certificates of Conformance: Submit written certification from the supplier of the following Contractor-furnished items to be used on this project that they conform to the requirements of this specification section.

1. Portland Cement

2. Aggregate

3. Isolation Joint Materials

4. Air-Entrainment Admixture

1.3 QUALITY ASSURANCE:

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

1. Freezing within the first 3 days of placement

2. Excessive or inadequate slump

3. Segregation of aggregate or over-vibration resulting in excessive water in the surface of the concrete

4. Honeycomb over 25% of the surface

5. Voids larger than 2 inches across

6. Exposed reinforcing steel

7. Misalignment of concrete

8. Substandard aggregate in the mix

MT-03306-2

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

2.1 MATERIALS:

A. Cement: Portland cement, Type IIA, according to ASTM C 150. The use of caked or hardened cement will not be permitted. Cement for job mixed concrete shall be delivered to the job site in unopened sacks.-

B. Water: Potable water shall be used for mixing concrete.

C. Aggregates: The aggregate shall be hard, durable, uncoated rock according to ASTM C 33.

1. The coarse aggregate shall have a maximum size of 1 inch, and not over

5 percent passing the No. 4 sieve.

2. The fine aggregate shall completely pass the No. 4 sieve with no more than 5 percent passing the No. 100 sieve. The fine aggregate shall contain no silt, loam, clay or organic particles.

D. Concrete Color: Davis Colors, Sandstone #5237

E. Air-Entraining Admixture: ASTM 260. The amount of air shall be 4 to 6 percent when maximum aggregate size is 3/4-inch, and 4.5 to 7.5 percent when maximum aggregate size is 3/8-inch. A variation of plus or minus 1 percent is allowable.

F. Rebar: #4 Rebar, Unit weight: 0.668 pounds per foot, Nominal diameter: 0.5 inches, Nominal area: 0.2 square inches, Grade 60.

G. Dowels: 1/2 inch smooth, Unit weight: 0.668 pounds per foot.

H. Isolation Joint Materials: Preformed filler strips shall be according to

ASTM D 994 and shall be the full width and depth of the joint. Unless otherwise indicated, the material shall be 1/2-inch thick.

2.2 MIXES – CONCRETE:

A. Concrete: Design of mixed concrete shall be according to ASTM C 94 and be designed for a 28-day compressive strength of 4000 psi, and a slump of 2 to 4 inches as determined by ASTM C 143. Concrete shall have pigment admixtures: Davis Sandstone #5237

B. Mixing Materials: Concrete shall be machine mixed. Mixers shall be batched according to their capacity and not overloaded. Mixing of ingredients shall continue for at least 3 minutes. The concrete shall be placed as soon as possible after mixing to prevent cold joints.

MT-03306-3

2.3 SOURCE QUALITY CONTROL

A. Concrete Testing: Shall be conducted each day there is a pour in the presence of the Contracting Officer Representative who shall be given 48-hours notice before any test is to be conducted. The Contractor shall pay all fees associated with and make arrangements for a certified, independent testing laboratory to perform the air content tests, compression tests of 3 cylinders and slump tests to substantiate mix designs. Record and distribute the results.

3.1 PREPARATION:

A. Clearing: Shall be according to Site Grading in Section MT-02213.

B. Subbase Preparation: Subbase and earth walls to be in contact with concrete shall be undisturbed or compacted according to Section MT-02213.

C. Form Construction: ACI 347R. Construct forms to the sizes, shapes, lines, and dimensions shown on the drawings and Manufacturer’s installation instructions, to obtain accurate alignment, location, grades, and level and plumb surfaces in finished structures. The Contractor shall provide construction aids and imbedded items such as anchor bolts.

Fabricate forms for easy removal without hammering or prying against the concrete surfaces. Provide crush plates or wrecking plates if stripping may damage the concrete. Form oil may be applied to facilitate removal of forms. Forms and subbase shall be wet before placement of concrete.

D. Form Inspection: Notify the Contracting Officer Representative 48 hours in advance of concrete placement to allow for inspection of forming and placement of items to be imbedded in the concrete. Excess water shall be removed from the forms before concrete placement.

E. Reinforcing Steel: Accurately position, support, and secure reinforcement steel against displacement. Locate and support reinforcement with bar supports to maintain minimum concrete cover. Workmen are not to walk on reinforcing steel during placement of concrete. Reinforcement shall be inspected by the Contracting Officer prior to concrete being placed.

F. Doweled Joints: Install dowel bars and support assemblies at joints where indicated. Lubricate or asphalt coat one-half of dowel length to prevent concrete bonding to one side of joint.

MT-03306-4

3.2 CONCRETE PLACEMENT:

A. Mix Design: Concrete shall not be placed until the mix design has been approved by the Contracting Officer Representative.

B. Placement and Consolidation: Concrete shall be placed in lifts with a maximum depth of 18 inches. Each lift shall be adequately vibrated, rodded, or spaded into place to fill voids. Where more than one lift is placed, a vibrator shall be used to consolidate the concrete by penetrating through the upper lift and at least 6 inches into the lower lift. Vibrators shall not be used next to the form or to move concrete.

Concrete shall be deposited as nearly as practical to its final position to avoid flow causing segregation of the aggregate. Concrete shall not be dropped more than 5 feet vertically without the use of a tremie or similar device.

C. Bonding to Existing Concrete: When a bond is desired between a fresh pour of concrete placed against concrete which has set, the surface of the in-place concrete shall be thoroughly cleaned of loose material, and the in-place concrete soaked with water. When no bond is desired, the surface of the existing concrete shall be painted with asphalt or other material to prevent bonding.

D. Concrete Placement Under Adverse Conditions: During hot weather, refer to

ACI 305R. During cold weather, refer to ACI 306R. Materials required for protection shall be on the jobsite before concrete work is started. Do not place concrete on a frozen subgrade or against surfaces having deposits of frost, snow, or ice.

3.3 CONCRETE FINISHING:

A. Concrete Surface Finishes: The top surface of walls and exterior slabs shall be given a wood-float finish after screeding. Concrete requiring skid-resistant finishes shall be broom-finished with horsehair or straw brooms. Interior slabs shall be given a steel-trowel finish unless otherwise indicated on the drawings. Power-trowels may be used. Brooms shall have a minimum width of 18 inches and shall be applied perpendicular to the centerline. Joints and panel borders shall be edged with a metal tool to leave a smooth border on the concrete.

B. Form Removal: Formwork not supporting concrete may be removed after curing at not less than 50 degrees F for 24 hours after placing the concrete, and when curing and protection procedures are followed as specified. The concrete should be sufficiently hard so as not to be damaged by form removal.

C. Concrete Finish Patching: Immediately after form removal, remove minor bulges and projections on exposed concrete by chipping or tooling, and rub or grind the surface. Chip honeycombed or other defective areas to solid concrete, cutting edges to right angles with the surface. Brush cavities

MT-03306-5

with a grout of cement and water, and paint with portland cement mortar.

Cure repairs the same as the concrete.

3.4 FIELD QUALITY CONTROL:

A. Testing: Testing shall be conducted in the presence of the Contracting

Officer Representative who shall be given 48-hours notice before any test is to be conducted. The Contractor shall make arrangements for a certified, independent testing laboratory to perform the air content tests, 3 - 28-day cylinders, and slump tests to substantiate each days pour. Record and distribute the results.

3.5 PROTECTION:

A. Requirements: During the curing period, protect concrete from load stresses, shock loads, or vibration. Protect surfaces from damage by equipment, other materials, running water, or rain.

1. Concrete Sidewalk: The work described in this section will be measured and paid for by Linear Feet, based on the dimensions of the structure and the details shown on the drawings. Include the cost of all materials, labor, reinforcing steel, etc., in the unit cost for

Sidewalk Trail.

MT-03306(1) Concrete Sidewalk . . . . . . . . . . . . . . . . Linear Feet

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