02722 Aggregate Base Course.docx
DOCX document 26 KB Posted
- Attached to
- SPLIT ROCK REC SITE PARKING LOT REBUILD
- Solicitation number
- 140L6221R0001
About this file
This document outlines specifications for a crushed aggregate base course to rebuild a parking lot at the Split Rock Recreation Site. The Bureau of Land Management Wyoming Region is soliciting bids under solicitation number 140L6221R0001 to complete the work. The project involves furnishing and installing approximately 5,880 square yards of crushed gravel or stone base course in 8-inch lifts on the prepared roadbed and parking areas. Aggregates must meet AASHTO specifications and have a maximum size of 1-1/4 inches, with plasticity between 2-6. The base must be compacted to 95 percent density and have a smooth, even surface within tolerances. Payment will be made on a square yard basis for satisfactory completion of the work according to the specifications.
View the file
Other files
Show all 35
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
| DIVISION 2 | SECTION 02722 |
| SITE CONSTRUCTION | CRUSHED AGGREGATE BASE COURSE |
PART 1: GENERAL
1.1 SUMMARY
A. Section Includes: This work shall consist of furnishing, placing, compacting, and fine grading approximately 5,880 Square yards crushed gravel or stone course in lifts not exceeding six (6) inches for a total of eight (8) inch depth on a prepared, stabilized roadbed/parking lot in accordance with these specification and in reasonably close conformity with the lines, grades, thickness and typical cross section shown on the plans or established by the Contracting Officer.
1.2 SUBMITTALS
A General: Submittals shall be according to Section 01009 - General Information and Requirements.
B Test Data: Submit three copies of test data for the Contractor-furnished aggregate to be used on this project. Testing shall have been performed by an independent testing laboratory according to Section 01458 – Testing Laboratory Services.
1.3 PROJECT/SITE CONDITIONS
A. Excess Materials: Shall be removed from the site according to Section 01009 – General Information and Requirements.
1.4 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.
PART 2: PRODUCTS
2.1 MATERIALS
A. Contractor-Furnished Crushed Aggregate: Shall consist of hard, durable 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 (Grading W) and maintenance of highways. Shall be according to AASHTO M 147.
1. The base aggregates shall have a maximum size of 1-1/4 inch. Plasticity index for base aggregates shall be two (2) to six (6). Base aggregates shall be uniformly graded from coarse to fine and shall be free of vegetable matter and clay balls.
PART 3 EXECUTION
3.1 PREPARATION
A. Requirements: Slide material shall be removed and the existing roadbed, including parking areas shall be scarified, bladed, and shaped. The material shall be in conformity with the line, grade, and cross sections shown on the plans or established by the Contracting Officer. High places in the roadbed shall be cut to grade and the resulting material hauled and deposited on low areas on fill slopes. If depressions or narrow embankments remain, approved material shall be obtained. Place material to bring the width and surface of the roadway in close conformity with the lines, grades, and cross sections shown on the plans or established by the Contracting Officer. The roadbed shall then be re-bladed and reshaped. At intersections, the roadbeds of side roads shall be treated similarly, as governed by the grading performed, to provide for proper joining of the proposed and existing riding surfaces. The roadbed shall be compacted.
3.2 MIXING
A. General: The material shall be mix to its full depth by means of power graders, traveling mixers or other approved mixing equipment. During the mixing, water shall be added in the amount necessary to provide the optimum moisture content for compaction.
3.3 INSTALLATION
| A. | General: The material shall be placed on the prepared surface and compacted in layers of the thickness shown on the drawings. When more than one layer is required, each layer shall be shaped and compacted before the succeeding layer is placed. |
| 1. | Placing shall be from vehicles equipped to distribute the material in a continuous uniform layer or windrow. The layer or windrow shall be of such size that when spread and compacted, the finished layer shall have the required thickness. |
| 2. | When hauling is done over previously placed material, hauling equipment shall be routed uniformly as possible over the entire surface of the constructed layers. |
B. Spreading: The mixture shall be spread smoothly for compaction to the required thickness.
C. Compacting: Immediately following final spreading and smoothing, each layer shall be compacted to the full width by approved compaction equipment. Rolling shall progress gradually from the sides to the center, parallel to the centerline of the road, or parking area, and shall continue until the entire surface has been rolled. Irregularities or depressions that develop shall be corrected by loosening the material at these places. Add or remove material until the surface is smooth and uniform. Along curbs, headers, and walls, and at places not accessible to the roller, the base material shall be compacted thoroughly with approved tampers or compactors.
D. Watering: Provide water and watering equipment to control dust and obtain required compaction. This work shall be done according to Section 02339 - Watering.
3.4 FIELD QUALITY CONTROL
A. Testing: The Contractor shall furnish necessary equipment, labor, and materials to conduct the testing. Testing shall be conducted in the presence of the Contracting Officer who shall be given 48 hour notice before a test is to be conducted. The Contractor shall make arrangements for a certified independent testing laboratory, according to the requirements of Section 01458 - Testing Laboratory Services, to perform the required testing, recording, and distributing of the results.
| B. | Density: |
| 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 method approved in writing by the Contracting Officer, has been achieved. |
| 2. | Inplace field density determinations are made according to AASHTO T 191, AASHTO T 205, or other approved method. The use of AASHTO T 224 to correct for oversize particles may be required. |
| 3. | Test holes are made at random during the work to determine the depth of uncompacted layers required to produce the designated depth of material after compacting to the specified density. |
| 4. | Cutting of the test holes and refilling with materials properly compacted shall be done by the Contractor and approved in writing by the Contracting Officer. |
C. Completed Course Thickness: Shall not vary more than 1/2-inch from the thickness required.
D. Surface: Shall be tested for acceptance by the Contractor with the Contracting Officer present with a 10ft straight edge after the base has been bladed and rolled into a smooth surface. Areas where the surface variation exceeds 1/2 inch in 10 ft shall be reworked until the variation falls within this limit.
PART 4: MEASUREMENT AND PAYMENT
4.1 METHOD OF MEASUREMENT
A. Units: The work described in this section will be paid for by the square yard. Crushed aggregate placed in excess of requirements will not be compensated.
4.2 BASIS OF PAYMENT
A. Payment: Prices and payment will be made at the contract price, as indicated in the Bid Schedule, and will include full compensation for the work described in this section. Payment will be made under:
Pay Item Description Pay Unit
02722(01) Reconstruct and Stabilize Parking/Roadway Square Yard
END OF SECTION
WFO BLM Split Rock Parking Lot Rebuild Project 02722 -
File details come from the government source that posted it. Updated .