INDEX. 
Page. 
Introduction 1 
TESTS FOR NONBITUMINOUS ROAD MATERIALS. 
1. Abrasion test for broken stone 3 
2. Abrasion test for gravel 3 
3. Dorry hardness test for rock 4 
4. Test for toughness of rock Q 
5. Specific gravity and absorption tests, stone or other coarse materials 7 
6. Tests for apparent specific gravity of sand, stone, or slag screenings and 
other fine nonbituminous highway materials 9 
7. Weight per cubic foot and void tests of coarse aggregate 11 
8. Weight per cubic foot test for fine aggregate 11 
9. Sieve analysis of broken stone, gravel, pebbles, or broken slag 12 
10. Sieve analysis of sand or fine aggregate 12 
11. Sieve analysis of mixtures of fine and coarse aggregates 13 
12. Tests for determining the amount of clay and silt in sand of fine aggregate, 
in gravel, and in sand -clay , topsoil, or semigravel 14 
13. Tests for semigravel, top soil, and sand-clay 15 
14. Tests for quality of water to be used in concrete 16 
15. Test for organic impurities in concrete aggregate 16 
16. Test for mortar-making quality of fine aggregate 17 
17. Standard specifications for Portland cement 17 
18. Tests for paving brick 28 
TESTS FOR BITUMINOUS ROAD MATERIALS. 
19. Determination of specific gravity of bituminous materials 36 
20. Determination of bitumen soluble in carbon disulphide 38 
21. Determination of bitumen insoluble in carbon tetrachloride 40 
22. Determination of bitumen insoluble in paraffin naphtha 40 
23. Volatilization test 41 
24. Flash and burning point tests 42 
25. Float test for consistency 43 
26. Fixed carbon determination 44 
27. Specific viscosity determination 44 
28. Determination of percentage of residue of penetration 45 
29. Test for penetration of bituminous materials 46 
30. Determination of ductility of bituminous materials 48 
31. Standard method for the distillation of tar and tar products 48 
32. Standard method for determination of softening point of bituminous mate- 
rials other than tar products . 52 
33. Method for examination of bituminous mixtures 55 
34. Determination of water in bituminous materials 58 
35. Tests of premolded joint fillers 58 
36. Tests for emulsions 58 
37. Determination of paraffin scale 59 
38. Standard method for distillation of creosote 59 
29465°— 21— Bull. 949 7 97 
