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 6 



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 



