1、Standard Specification for Materials for Aggregate and SoilAggregate Subbase, Base, and Surface Courses AASHTO Designation: M 147-17 Technical Section: 1b, Geotechnical Exploration, Instrumentation, Stabilization, and Field Testing Release: Group 3 (August 2017) American Association of State Highway
2、 and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001TS-1b M 147-1 AASHTO Standard Specification for Materials for Aggregate and SoilAggregate Subbase, Base, and Surface Courses AASHTO Designation: M 147-17 Technical Section: 1b, Geotechnical Exploration, Inst
3、rumentation, Stabilization and Field Testing Release: Group 3 (August 2017) 1. SCOPE 1.1. This specification covers the quality and grading of sandclay mixtures; gravel, stone, or slag screenings; or sand, crusher run coarse aggregate consisting of gravel, crushed stone, or slag with or without soil
4、 mortar or any combination of these materials for use in the construction of subbase, base, and surface courses. 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 Disturbed Soil and SoilAg
5、gregate Samples for Test R 74, Wet Preparation of Disturbed Soil 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 88, Particle Size Analysis of Soils T 89, Determining th
6、e Liquid Limit of Soils T 90, Determining the Plastic Limit and Plasticity Index of Soils 3. T 96, RESISTANCE TO DEGRADATION OF SMALL-SIZE COARSE AGGREGATE BY ABRASION AND IMPACT IN THE LOS ANGELES MACHINEGENERAL REQUIREMENTS 3.1. Coarse Aggregate: 3.1.1. Coarse aggregate retained on the 2.00-mm (No
7、. 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.
8、2017 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 Note 1A higher or lower percentage of wear may be specified by the engineer, depending on the materials available for the work. 3.2.
9、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 (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-
10、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 soilaggregate material shall conform to the grading requirements o
11、f Table 1. The grading requirements for composite aggregate material will be specified by the engineer. Table 1Grading Requirements for SoilAggregate Materials 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
12、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 0.425 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 t
13、he 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 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 d
14、amage by frost action, the engineer should specify such lower percentages. 5. BASE COURSE MATERIALS 5.1. Materials for base course shall conform to the requirements 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 lowe
15、r 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, the engineer should specify such lower percentages. 6. SURFACE COURSE MATERIALS 6.1. Materials for surface course shall conform to the requi
16、rements of Sections 3 and 4 for Gradings C, D, E, or F. The gradings desired shall be specified. 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 2017 by the Ame
17、rican Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-1b M 147-3 AASHTO engineer 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, o
18、r 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. All materials shall contain moisture equal to or slightly below the optimum necessary to ensure that the design density requirements are ob
19、tained 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 SAMPLING AND TESTING 9.1. Sampling and testing shall be in accordance with the following standard methods of the American Association of State
20、Highway and Transportation Officials: Sampling, T 2 Sieve analysis, T 27 or T 88 Preparing samples, R 58 or R 74 Liquid limit, T 89 Plastic limit and plasticity index, T 90 Percentage of wear, T 96 Passing 75-m (No. 200 sieve), T 11 10. KEYWORDS 10.1. Aggregate base; aggregate subbase; aggregate surface course; gradation characteristics; sandclay mixtures. 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.
