Page 531882 AGGREGATES FOR GRANULAR BASES AND SURFACING
882.1 General Requirements
The material will conform to the specifications for the particular material required by the contract. The material will be sound durable particles of ledge rock, gravel, recycled concrete pavement (RCA) removed from within the project limits, and sand. The material may include limited amounts of fine soil particles, but will be free of vegetation or organic debris, paper, metal, glass, and other foreign material.
882.2 Specific Requirements
Aggregates for granular bases and surfacing will conform to the requirements of Table 1. TABLE 1 *1The fraction passing the #200 sieve will not be greater than 2/3 of the fraction passing the #40 sieve. In no case will the upper limit specified for the #200 sieve be exceeded. *2Requirements apply to ledge rock other than limestone ledge rock. *3Acceptance of pit run will be by visual inspection. The Engineer may require a sieve analysis to verify the material meets the specified gradation. Independent Assurance will not be required.
882.3 Sampling & Testing
Sampling .......................................................................................................... SD 201 Gradation ......................................................................................................... SD 202 Liquid Limit and Plasticity Index ....................................................................... SD 207 LA Abrasion Test ............................................................................................. SD 204 Crushed Particles ............................................................................................. SD 211Limestone Ledge Rock REQUIREMENT SubbaseGravel Cushion Base CourseBase CourseGravel CushionGravel SurfacingPit RunGranular Bridge End Backfill Sieve Percent Passing 6 inch 100 2 inch 100 1 inch 70-100 100 100 100 100 100 3/4 inch 80-100 80-100 80-100 80-100 100 80-100 1/2 inch 68-91 68-91 68-90 68-90 68-91 #4 30-70 46-70 46-70 42-70 42-70 50-78 0-60 38-70 #8 22-62 34-58 34-58 29-53 29-53 37-67 28-58 #40 10-35 13-35 13-35 10-28 10-28 13-35 10-35 #200 0.0-15.0 3.0-12.0 3.0-12.0 3.0-12.0 3.0-12.0 4.0-15.0 0-20.0 0.0-5.0 Other Properties Liquid Limit (max) 25 25 25 25 25 Plasticity Index 0-6 0-6 0-6 0-3 0-3 4-12 0-6 LA Abrasion Loss (maximum)50 40 40 40 40 40 40 Crushed Particles (minimum) +#4 Sieve30% 1-CF 30% 1-CF 30% 1-CF 30% 1-CF 30% 1-CF 30% 1-CF 30% 1-CF Foot Notes *2*1,*2*3 Page 532883 CLAY
883.1 Requirements
Clay to be used for gravel surfacing or granular materials to be lime treated will consist of soil binder or fines, uniform in texture, fineness, and other characteristics. Seams, layers, and pockets of soil encountered not having qualities considered suitable for the intended use will be wasted. During production the clay will be screened over a 1 inch sieve to remove oversize clumps and vegetation. The plasticity index of the clay will be from 10 to 32 and the liquid limit will not exceed 50, when tested in accordance with SD 207. When mixing by a central plant is required, the clay will be pulverized and will meet the following requirements based on undried weight just prior to blending with the gravel when tested in accordance with SD 215. Sieve Size Percent Passing 3/4 inch 100 3/8 inch 85 - 100 #4 65 – 100
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