AASHTO M 147:1965(2012) Standard Specification for Materials for Aggregate and Soil-Aggregate Subbase, Base, and Surface Courses.
This specification covers the quality and grading of sand-clay mixtures; gravel, stone, or slag screenings; or sand, crusher run coarse aggregate consisting of gravel, crushed stone, or slag with or without soil mortar or any combination of these materials for use in the construction of subbase, base, and surface courses. The requirements are intended to cover only materials having normal or average specific gravity, absorption, and gradation characteristics. (See T 84 and T 85.) Where other materials are to be used, appropriate limits suitable to their use must be specified.
1 .2. The values stated in SI units are to be regarded as the standard.
2.1. AASHTO Standards:
• M 144, Calcium Chloride
• R 58, Dry Preparation of Disturbed Soil and Soil-Aggregate Samples for Test
• T 2, Sampling of Aggregates
Materials Finer Than 75-um (No. 200) Sieve in Mineral Aggregates by Washing
Sieve Analysis of Fine and Coarse Aggregates
Specific Gravity and Absorption of Fine Aggregate
Specific Gravity and Absorption of Coarse Aggregate
Particle Size Analysis of Soils
Determining the Liquid Limit of Soils
Determining the Plastic Limit and Plasticity Index of Soils
Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine
• T 146, Wet Preparation of Disturbed Soil Samples for Test
3. 1 . Coarse Aggregate:
3.1.1. Coarse aggregate retained on the 2.00-mm (No. 10) sieve shall consist of hard, durable particles or fragments of stone, gravel, or slag. Materials that break up when alternately frozen and thawed or wetted and dried shall not be used.
3.1.2. Coarse aggregate shall have a percentage of wear, by the Los Angeles test, T 96, of not more than 50.
Note 1—A higher or lower percentage of wear may be specified by the engineer, depending upon the materials available for the work.
3.2. Fine Aggregate:
3.2.1. Fine aggregate passing the 2.00-mm (No. 10) sieve shall consist of natural or crushed sand, and
fine mineral particles passing the 75-urn (No. 200) sieve.
3.2.2. The fraction passing the 75-tm (No. 200) sieve shall not be greater than two thirds of the fraction passing the 0.425-mm (No. 40) sieve. The fraction passing the 0.425-mm sieve shall have a liquid limit not greater than 25 and a plasticity index not greater than 6.
3.3. All material shall be free from vegetable matter and lumps or balls of clay. The soil-aggregate material shall conform to the grading requirements of Table 1. The grading requirements fbr composite aggregate material will be specified by the engineer.AASHTO M 147 pdf download.