1、Standard Specification for Materials for Aggregate and Soil-Aggregate Subbase, Base, and Surface Courses AASHTO Designation: M 147-65 (2012) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001TS-1b M 147-1 AASHTO Standard
2、 Specification for Materials for Aggregate and Soil-Aggregate Subbase, Base, and Surface Courses AASHTO Designation: M 147-65 (2012) 1. SCOPE 1.1. This specification covers the quality and grading of sand-clay mixtures; gravel, stone, or slag screenings; or sand, crusher run coarse aggregate consist
3、ing 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 charac
4、teristics. (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. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 144, Calcium Chloride R 58, Dry Preparation of Dis
5、turbed Soil and Soil-Aggregate Samples for Test T 2, Sampling of Aggregates T 11, Materials Finer Than 75-m (No. 200) Sieve in Mineral Aggregates by Washing T 27, Sieve Analysis of Fine and Coarse Aggregates T 84, Specific Gravity and Absorption of Fine Aggregate T 85, Specific Gravity and Absorptio
6、n of Coarse Aggregate 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 96, Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine T 146, Wet Prepar
7、ation of Disturbed Soil Samples for Test 3. GENERAL REQUIREMENTS 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
8、 and dried shall not be used. 2014 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-1b M 147-2 AASHTO 3.1.2. Coarse aggregate shall have a percentage of wear, by the Los Angeles test, T 96, of not more than
9、 50. Note 1A 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-m (
10、No. 200) sieve. 3.2.2. The fraction passing the 75-m (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 mat
11、erial 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 for composite aggregate material will be specified by the engineer. Table 1Grading Requirements for Soil-Aggregate Material
12、s Sieve Designation Mass Percentage Passing Standard, mm Alternate Grading A Grading B Grading C Grading D Grading E Grading F 50.0 2 in. 100 100 25.0 1 in. 7595 100 100 100 100 9.5 3/8in. 3065 4075 5085 60100 4.75 No. 4 2555 3060 3565 5085 55100 70100 2.00 No. 10 1540 2045 2550 4070 40100 55100 0.4
13、25 No. 40 820 1530 1530 2545 2050 3070 0.075 No. 200 28 520 515 520 620 825 4. SUBBASE MATERIALS 4.1. Materials for subbase shall conform to the requirements of Sections 3 and 4 for Gradings A, B, C, D, E, or F. The type and grading desired shall be specified. Note 2Where local experience has shown
14、that lower percentages passing the 75-m (No. 200) sieve than are required in Table 1 are necessary for subbase materials in order to prevent damage by frost action, the engineer should specify such lower percentages. 5. BASE COURSE MATERIALS 5.1. Materials for base course shall conform to the requir
15、ements of Section 3 for Gradings A, B, C, D, E, or F. The grading desired shall be specified. Note 3Where local experience has shown that lower percentages passing the 75-m (No. 200) sieve than are required in Table 1 are necessary for base course materials in order to prevent damage by frost action
16、, the engineer should specify such lower percentages. 6. SURFACE COURSE MATERIALS 6.1. Materials for surface course shall conform to the requirements of Sections 3 and 4 for Gradings C, D, E, or F. The gradings desired shall be specified. 2014 by the American Association of State Highway and Transpo
17、rtation Officials.All rights reserved. Duplication is a violation of applicable law.TS-1b M 147-3 AASHTO Note 4Where it is planned that the soil aggregate surface course is to be maintained for several years without bituminous surface treatment or other superimposed impervious surfacing, the enginee
18、r should specify a minimum of 8 percent passing 75-m (No. 200) sieve in lieu of the minimum percentages shown in Table 1 for Gradings C, D, or E, and should specify a maximum liquid limit of 35 and plasticity index range of 4 to 9 in lieu of the limits given in Section 3.2.2. 7. MOISTURE CONTENT 7.1
19、. All materials shall contain moisture equal to or slightly below the optimum necessary to ensure that the design density requirements are obtained when materials are compacted. 8. ADMIXTURE 8.1. Calcium chloride used for the control of moisture shall meet the requirements of M 144. 9. METHODS OF SA
20、MPLING AND TESTING 9.1. Sampling and testing shall be in accordance with the following standard methods of the American Association of State Highway and Transportation Officials: Sampling, T 2 Sieve analysis, T 27 or T 88 Preparing samples, R 58 Liquid limit, T 89 Plastic limit and plasticity index, T 90 Percentage of wear, T 96 Passing 75-m (No. 200 sieve), T 11 2014 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.
