18 BULLETIN 586, U. S. DEPARTMENT OF AGRICULTURE. 
TaBLE 18.—Analyses of asphalts. 
Experiment. 
Bitumi- 
Clay 
nous gravel 
concrete. asphalt. 
Speciliceraviti255/250 Ch eeace sme sealers te mse ee ee eee eee ae eae ae ae 1.041 1.035 
elting point wC wee en esensescese eee - 54.5 55 
Penetration at 25° C., 100 grams, 5 sec... 64 101 
Loss, 5 hours, 163° Gy 20 grams>_......-....- be - 28 -42 
Penetration of residue, asiabove: ste ee ete ee J BUSS AR Ae faaes eaabds Sseee 42 57 
Per cent of total bitumen insoluble in 86° B naphtha..........-...-..--.-----.-- 29. 48 27.09 
IDrbatol CaO 0 Ae SS Sa) Se Ree ocbdbahonced sasee suse sods odeenbobscendace per cent. . 18. 88 17. 03 
Seluplain CS; (total bitumen). ey eee fey ee deccen 0 Peed) dons 99. 45 99. 86 
Organic matter, jnsolubles sss sce cscs ee eine neler eine eee elena do.... 16 -10 
Inorganic matter, insoluble.......-.-.- Sobsecrebond $436 ostcegeoerscoeeas do.... -39 04 
Botaeye eee ete eae ie ee ANSE cl enB RMR ER eae AER Cueva ab. Seine do.... 100. 00 100. 00 
Taste 19.— Tests of bituminous concrete (plant samples). 
Sample | Sample Sample | Sample 
3 having having Average 
having having | maximum | minimum of 61 
maximum | minimum | “coarse coarse samples 
bitumen. | bitumen. ‘pies. 
aggregate. | aggregate. 
Per cent. Per cent. Per cent. Per cent. Per cent. 
IAT Oo oteguenopeconscosdesesmesaze= 8.5 5.2 5.4 -0 6.5 
Aggregateretained on j-inch screen......-- 48.4 59.0 68.3 34.1 54.5 
Passing } inch screen and retained on 200- 
MeSHSIOVOsP eee see eeeee eee ar terrae 38. 5 34.3 23.3 55. 2 35.8 
Passing 200-mesh sieve...-..-..-.---------- 4.6 1.5 3.0 3.7 Sue 
Totalsaetesis secee sce tcc es osiceee ae 100. 0 100.0 100.0 100. 0 100.0 
TaBLE 20.— Tests of bituminous concrete (road samples). 
Sample Sample Sample Sample 
F F having having Average 
having having | maximum | minimum of 42 
BESTE || aeveNee Eee coarse coarse samples 
bitumen. | bitumen. TASS 
aggregate. | aggregate. 
AB iLMIMOn Ts ee ent Te te re nat ear re ee 8.8 4.0 5.1 6.4 
Aggregateretained on {-inch screen.......- 52.9 62.8 66. 8 46.5 54.5 
Passing +-inch screen and retained on 200- 
MESHSIOV PS saree eee eee aseaesee ee sear 35. 8 31.3 25.7 41.6 36.1 
Passing 200-mesh sieve...........--...----- 2.5 1.9 2.4 3.4 3.0 
FENgu) Bo AA eg A A BeNOR 100. 0 100.0 100.0 100.0 100.0 
TABLE 21.— Mechanical analysis of earth. 
/ Per cent, 
Passing }-inch screen, retained on 10-mesh sieve..............--------------- 0.4 
Passing 10-mesh sieve, retained on 20-mesh sieve...............--.-.---- ree ioeeed (0) 
Passing 20-mesh sieve, retained on 30-mesh sieve...............----.-------- 2.0 
Passing 30-mesh sieve, retained on 40-mesh sieve..............-------------- 3.0 
Passing 40-mesh sieve, retained on 50-mesh sieve..........------------------ 3.0 
Passing 50-mesh sieve, retained on 80-mesh sieve.......-..-------------+---- 4.8 
Passing 80-mesh sieve, retained on 100-mesh sieve...........-..------------- 2.2 
Passing 100-mesh sieve, retained on 200-mesh sieve..............------------ 4.6 
Passing 200-mesh sieve..........--...- BOC, SAMAR ERA i PRN eee COMED LT Ye 79.0 
