1、Standard Specification for Materials for Embankments and Subgrades AASHTO Designation: M 57-80 (2012) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001TS-1b M 57-1 AASHTO Standard Specification for Materials for Embankm
2、ents and Subgrades AASHTO Designation: M 57-80 (2012) 1. SCOPE 1.1. This specification covers materials for use in the construction of embankments and subgrades. 1.2. The values stated in SI units are to be regarded as the standard. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 145, Classificatio
3、n of Soils and Soil-Aggregate Mixtures for Highway Construction Purposes M 146, Terms Relating to Subgrade, Soil-Aggregate, and Fill Materials R 58, Dry Preparation of Disturbed Soil and Soil-Aggregate Samples for Test T 11, Materials Finer Than 75-m (No. 200) Sieve in Mineral Aggregates by Washing
4、T 27, Sieve Analysis of Fine and Coarse Aggregates T 88, Particle Size Analysis of Soils T 89, Determining the Liquid Limit of Soils T 90, Determining the Plastic Limit and Plasticity Index of Soils T 99, Moisture-Density Relations of Soils Using a 2.5-kg (5.5-lb) Rammer and a 305-mm (12-in.) Drop T
5、 146, Wet Preparation of Disturbed Soil Samples for Test T 180, Moisture-Density Relations of Soils Using a 4.54-kg (10-lb) Rammer and a 457-mm (18-in.) Drop T 191, Density of Soil In-Place by the Sand-Cone Method T 233, Density of Soil In-Place by Block, Chunk, or Core Sampling T 310, In-Place Dens
6、ity and Moisture Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth) 3. TERMINOLOGY 3.1. Terminology for these materials is given in M 146. 4. GENERAL REQUIREMENTS 4.1. Materials shall be free from detrimental quantities of organic material, such as leaves, grass, roots, and sewage
7、. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-1b M 57-2 AASHTO 4.2. Materials obtained from cuts or borrow areas shall conform to one of the following requirements: Note 1See M 145. 4.2.1. In Emba
8、nkmentsMaterials classified in the A-1, A-2-4, A-2-5, or A-3 groups as in M 145 shall be used when available and shall be compacted to the depth specified to not less than 95 percent of the maximum density per T 99. If material of this character is not available and materials from the A-2-6, A-2-7,
9、A-4, A-5, A-6, or A-7 groups must be used, special attention should be given to the design and construction of the embankment. Materials from these groups shall be compacted to not less than 95 percent of the maximum density and within two percentage points of the optimum moisture content per T 99.
10、4.2.2. In SubgradesMaterials classified in the A-1, A-2-4, A-2-5, or A-3 groups as shown in M 145 shall be used when available and shall be compacted to the depth specified to not less than 95 percent of the maximum density per T 99. Materials in the A-2-6, A-2-7, A-4, A-5, A-6, or A-7 groups may be
11、 used if compacted to the depth specified to not less than 95 percent of the maximum density and within two percentage points of the optimum moisture content per T 99. 4.3. Local shale may be used in embankment or subgrade construction if the condition of existing pavements and embankments indicates
12、 satisfactory results. Appropriate special specifications shall be prepared for such material. 5. DENSITY REQUIREMENTS 5.1. Density percentage requirements may be specified in terms of T 180, if the resultant density and optimum moisture content are comparable with T 99 under the above conditions. 6
13、. METHODS OF TESTING 6.1. Methods of testing materials for embankments and subgrades shall be in accordance with the standard methods of the American Association of State Highway and Transportation Officials. (See Table 1.) Table 1AASHTO Standard Methods Soil preparation (dry method) R 58 Soil prepa
14、ration (wet method) T 146 Material passing 75-m (No. 200) sieve T 11 Sieve analysis T 27 Mechanical analysis of soils T 88 Liquid limit T 89 Plastic limit T 90 Moisture-density relationship 2.5-kg (5.5-lb) rammer T 99 Moisture-density relationship 4.54-kg (10-lb) rammer T 180 Density of soil in-plac
15、e T 191, T 233 Moisture in-place by nuclear methods T 310 Note 2Use either T 88 or T 11 and T 27 to determine the particle size distribution as a basis for classification. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.
