Attach 1.Spec 10.32 11 23.09R0007.pdf

Solicitaion No. FA5270-09-R-0007

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LXEZ 09-2663

SECTION 32 11 23

GRADED CRUSHED AGGREGATE BASE COURSE

PART 1 - GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only. The most current editions shall be used.

AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM):

ASTM C117-04 Materials Finer Than 75-µm (No. 200) Sieve in Mineral Aggregates by Washing

ASTM C131-06 Resistance to Degradation of Small- Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine

ASTM C136-06 Sieve Analysis of Fine and Coarse Aggregates

ASTM D 75-03 Sampling Aggregates

ASTM D1556-00 Density of Soil in Place by the Sand-Cone Method

ASTM D1557-00 Laboratory Compaction of Soil Using Modified Effort Characteristics

ASTM D1883-05 CBR (California Bearing Ratio) of Laboratory- Compacted Soils

ASTM D4318-05 Liquid Limit, Plastic Limit, and Plasticity Index of Soils

ASTM D2217-98 Wet Preparation of Soil Samples for Particle- Size Analysis and Determination of Soil Constants

ASTM E11-04 Wire Cloth Sieves for Testing Purposes

JAPANESE INDUSTRIAL STANDARDS (JIS):

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JIS A 1102-99 Method of Test for Sieve Analysis of Aggregate

JIS A 1103-97 Method of Test for Amount of Material Passing Standard Sieve 74 Micrometer (200 Sieve) in Aggregate

JIS A 1121-93 Method of Test for Abrasion of Coarse Aggregate by

Use of the Los Angeles Machine

JIS A 1201-90 Method of Preparing Soil Samples for Grain-Size Analysis and Physical Tests

JIS A 1205-99 Test Method for Liquid Limit and Plastic Limit of Soils

JIS A 1210-99 Method of Test for Moisture-Density Relations of Soils Using Rammer

JIS A 1211-9 Method of Test for California Bearing Ratio of Soils

1.2 SUBMITTALS

Submit the following in accordance with Section 01 11 00, "General Requirements". See AF Form

66 on submittal schedule.

a. Factory Test Reports:

1. Gradation

2. Bearing ratio

b. Field Test Reports:

1. Gradation

2. Smoothness

3. Thickness

1.3 DELIVERIES AND STORAGE

Inspect materials delivered to site for damage and store to prevent segregation and contamination.

1.4 WEATHER LIMITATIONS

Do not construct base course when rainfall or other weather conditions detrimentally affect the quality of the finished course.

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1.5 CONSTRUCTION EQUIPMENT

Equipment shall be dependable and adequate for the purpose intended. Maintain equipment in satisfactory and safe operating condition. Subject to approval, special equipment dictated by local conditions may be used. Calibrated equipment, such as scales, batching equipment, spreaders, and similar items, shall have been recalibrated by within 12 months of commencing work.

PART 2 - PRODUCTS

2.1 MATERIALS

Consist of durable and sound crushed stone or crushed slag, free of lumps or balls of clay or other objectionable matter. Crushed stone shall be free from flat, elongated, soft, or disintegrated pieces, retained on a No. 4 sieve having at least 90 percent by weight with at least two fractured faces and 100 percent by weight with at least one fractured face. Base course materials samples shall have a Bearing Ratio of at least 100 as determined by laboratory tests on a 4-day soaked specimen in accordance with ASTM D1883 or JIS A 1211; compact specimen in accordance with ASTM D1557, Method D or JIS A 1210, Method 2. Determine grain size in accordance with ASTM C136 or JIS A 1102 and amount of material finer than 200 mesh sieve in accordance with ASTM C117 or JIS A 1103. Aggregate, other than slag, shall have a percentage of wear not exceeding 40 when tested in accordance with ASTM C131 or JIS A 1121, Grading A. Slag shall be an air-cooled, blast furnace product having a dry weight of not less than 94 pounds per cubic foot when tested in accordance with ASTM C29/C29M or JIS A 1104 and shall consist of angular fragments uniform in density and quality, reasonably free from thin, elongated pieces, dirt, or other objectionable material. Soil binder material, that portion of material passing the No. 40 sieve, shall be of such composition that the composite material conforms to the requirements specified herein. The base course shall be of such nature that it can be compacted readily with watering and rolling to a firm, stable base and shall conform to one of the following sizes:

Percentage by Weight Passing

Square Mesh Laboratory Sieves

Size Numbers Sieves 1 2 3

2 inches (50.8mm) 100 -- - --- 1-1/2 inches (38.1mm) 70-100 100 --- 1 inch (25.4mm) 45-80 60-100 100 1/2 inch (12.7mm) 30-60 30-65 40-70 No. 4 (4.76mm) 20-50 20-50 20-50 No. 10 (2.00mm) 15-40 15-40 15-40 No. 40 (0.42mm) 5-25 5-25 5-25 No. 200 (0.074mm) 0-10 0-10 0-10

That portion of the material passing the No. 40 sieve shall have a liquid limit of not more than 25 and a plasticity index of not more than 5 as determined by ASTM D4318 or JIS A 1205.

Prepare samples in accordance with ASTM D2217, Procedure A or JIS A 1201.

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PART 3 - EXECUTION

3.1 BASE COURSE

Construct the graded aggregate base course on a prepared subgrade as indicated. Provide line and grade stakes for control. Place grade stakes in lanes parallel to the centerline of areas to be paved and space for string lining or other control methods. The base course shall consist of aggregate processed, deposited, spread, and compacted on a prepared surface. The Contractor shall be responsible for protection of completed areas against detrimental effects. Recondition, reshape, and recompact areas damaged by rainfall or other weather conditions.

3.2 MIXING OF MATERIALS

Mix aggregates in a stationary or traveling plant. Proportion aggregates by weight or volume in such quantities that specified gradation, liquid limit, and plasticity index requirements are met after the base course has been placed and compacted. Incorporate, during the mixing operation, water in quantities sufficient to provide the necessary moisture content for the specified compaction. Mixing operations shall produce satisfactory uniform blending and the method of discharging into trucks shall not produce segregation.

3.3 PLACING

Do not dump mixed materials in piles, but place in layers of uniform thickness. When a compacted course 6 inches in thickness is required, place material in a single layer. When a compacted course in excess of 6 inches is required, place material in layers of equal thickness.

Do not exceed 6 inches or have less than 3 inches in thickness for any compacted layer. Place layers so that when compacted, they will be true to grades or levels required with the least possible surface disturbance. Where the base course is constructed in more than one layer, clean previously constructed layers of loose and foreign matter. Maintain material water content during the placing period to obtain the compaction specified. Make adjustments in placing procedures or equipment to obtain true grades, to minimize segregation and degradation, to reduce or increase water content, and to insure a satisfactory base course.

3.4 COMPACTING AND FINISHING

Immediately following the placing, spread the finished mixture uniformly in a layer and bring to optimum moisture content. The loose thickness and the surface of the layer shall be such that the specified density and the required thickness shall be obtained after compaction. Compact the layer with suitable compacting equipment. Continue compacting until the layer is compacted through the full depth to a field density of at least 100 percent of the maximum density at optimum moisture content tested in accordance with ASTM D1556 or JIS A 1214. In areas not accessible to rollers or compactors, compact the mixture with mechanical hand tampers. If the mixture is excessively moistened by rain, aerate by suitable equipment. Aerate until the moisture content of the material is that needed to obtain the required density. Final surface shall be smooth and free from waves, irregularities, and ruts or soft yielding spots.

3.5 SAMPLING AND TESTING

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Sampling and testing shall be the responsibility of the Contractor. Sampling and testing shall be performed by an approved commercial testing laboratory, or by the Contractor subject to approval. If the Contractor elects to establish testing facilities of his own, no work requiring testing will be permitted until the Contractor’s facilities have been inspected and approved. The first inspection of the facility shall be at the expense of the Government and any subsequent inspections required because of failure of the first inspection will be the expense of the Contractor. The material shall be tested to establish compliance with the specified requirements.

a. Samples: Samples for laboratory testing shall be taken in conformance with ASTM d75.

When deemed necessary, the sampling will be observed by the Contracting Officer Representative (COR).

b. Tests:

1. Sieve analysis: Sieve analysis shall be made in conformance with ASTM C117 or

JIS A 1103 and ASTM C136 or JIS A 1102. Sieves shall conform to ASTM E11.

2. Smoothness tests: Test with a 3-meter straightedge, applied parallel with and at right angles to the centerline of the paved area. Correct deviations in the surface in excess of 10 mm by loosening, adding or removing material, reshaping, watering, and compacting. The smoothness requirements specified herein apply only to the top layer when base course is constructed in more than one layer.

3. Field density tests: ASTM D1556.

4. Laboratory density tests: In accordance with ASTM D5117, Method D or JIS 1210, Method No. 2.

5. Thickness tests: Make depth measurements by test holes, at least 75 mm in diameter, through the base course. Wherever base course deficiency is more than 13 mm, correct by scarifying, adding mixture of proper gradation, rebuilding, and re-compacting. Where the measured thickness is more than 13 mm thicker than indicated, consider it as the indicated thickness plus 13 mm for determining the average. The average thickness is the average of the depth measurements and shall not under run the thickness indicated.

3.6 MAINTENANCE

After construction is completed, maintain the base course throughout. Maintenance includes drainage, rolling, shaping, and watering, as necessary, to maintain the course in proper condition.

Correct deficiencies in thickness, composition, construction, smoothness, and density, which develop during the maintenance, to conform to the requirements specified herein.

Maintain sufficient moisture by light sprinkling with water at the surface to prevent a dusty condition.

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