34 
BULLETIN 407, U. S. DEPARTMENT OF AGRICULTURE. 
Table 35. — Analysis of bituminous concrete (Topeka specification). 
Per cent. 
Bitumen soluble in CS 2 8. 25 
Mineral aggregate: 
Passing ^-inch screen, retained on ^-inch screen 7. 9 
Passing £-inch screen, retained on 10-mesh sieve 17. 2 
Passing 10-mesh sieve, retained on 20-mesh sieve 17. 3 
Passing 20-mesh sieve, retained on 30-mesh sieve 9. 8 
Passing 30-mesh sieve, retained on 40-mesh sieve = 9. 3 
Passing 40-mesh sieve, retained on 50-mesh sieve 10. 2 
Passing 50-mesh sieve, retained on 80-mesh sieve 14. 2 
Passing 80-mesh sieve, retained on 100-mesh sieve 2. 7 
Passing 100-mesh sieve, retained on 200-mesh sieve 7. 5 
Passing 200-mesh sieve 3. 9 
Total 100. 
Table 36. — Analysis of bituminous concrete (District of Columbia specification). 
Per cent. 
Bitumen soluble in CS 2 7. 2 
Mineral aggregate: 
Passing 1-inch screen, retained on f-inch screen 6. 8 
Passing f-inch screen , retained on ^-inch screen 14. 4 
Passing ^-inch screen, retained on £-inch screen 24. 3 
Passing ^-inch screen, retained on 10-mesh sieve 14. 
Passing 10-mesh sieve, retained on 20-mesh sieve 7. 5 
Passing 20-mesh sieve, retained on 30-mesh sieve 6. 1 
Passing 30-mesh sieve, retained on 40-mesh sieve 6. 4 
Passing 40-mesh sieve, retained on 50-mesh sieve 6. 2 
Passing 50-mesh sieve, retained on 80-mesh sieve 4. 4 
Passing 80-mesh sieve, retained on 100-mesh sieve 1.1 
Passing 100-mesh sieve, retained on 200-mesh sieve 4. 4 
Passing 200-mesh sieve 4. 4 
Total 100. 
Table 37. — Analyses of oil asphalts used in experiments at Washington, D. C. 
Use. 
Bitu min ous 
concrete, 
Specific gravity 25°/25° C 
Melting point, ° C 
Penetration at 25° C, 100 grams, 5 seconds 
Loss, 5 hours at 163° C, 20 grams, per cent 
Penetration of residue, as above 
Per cent of total bitumen insoluble in 86° C. naphth 
Fixed carbon, per cent 
Soluble in CS 2 (total bitumen), per cent 
Organic matter insoluble, per cent 
Inorganic matter insoluble, per cent 
Total, per cent 
1.055 
55 
63 
.56 
40 
26.40 
19.32 
1.055 
58.5 
47 
.31 
34 
31.76 
19.33 
98.39 
.70 
.91 
99. 
.11 
.01 
100.00 
100.00 
