14 



BULLETIN 407, U. S. DEPAETMENT OF AGRICULTURE. 



Table 11. — Analyses of typical samples of fluxed native asphalt gravel mix used in experi- 

 ment No. 10. 



m. 



Bitumen soluble in CS^ 



Mineral aggregate: 



Passing IJ-inch screen, retained on 1-inch screen. . . 



Passing 1-inch screen, retained on |-inch screen 



Passing |-inch screen, retained on |-inch screen 



Passing |-inch screen, retained on J-inch screen 



Passing |-inch screen, retained on lO-mesh sieve . . . 

 Passing lO-mesh sieve, retained on 20-mesh sieve. . . 

 Passing 20-mesh sieve, retained on 30-mesh sieve. . . 

 Passing 30-mesh sieve, retained on 40-mesh sieve. . . 

 Passing 40-mesh sieve, retained on 50-mesh sieve. . . 

 Passing 50-mesh sieve, retained on 80-mesh sieve. . . 

 Passing 80-mesh sieve, retained on 100-mesh sieve. . 

 Passing 100-mesh sieve, retained on 200-mesh sieve. 

 Passing 200-mesh sieve 



Total. 



Per cent. 

 6.39 



7.5 



18.0 



13.4 



7.0 



8.8 



11.1 



9.3 



6.3 



1.8 



3.2 



4.7 



Per cent. 

 7.11 



3.3 



2.7 



12.7 



18.7 



12.1 



5.9 



8.0 



11.2 



7.4 



7.2 



.8 



3.3 



6.7 



100.0 



Per cent. 

 7.26 



5.2 



9.9 



19.4 



14.5 



7.3 



11.5 



13.4 



7.3 



5.8 



.8 



2.1 



2.8 



100.0 



Table 12. — Typical analyses of tar-gravel m,ixtures used in experiment No. 11. 



Bitumen soluble inCS^ 



Mineral aggregate: 



Passing 2-inch screen, retained on IJ-inch screen.. . . 

 Passing Ij-tnch screen, retained on IJ-inch screen. . , 



Passing l^-inch screen, retained on 1-inch screen 



Passing 1-inch screexi, retained on J-inch screen 



Passing |-inch screen, retained on §-inch screen 



Passing ^inch screen, retained on i-inch screen 



Passing J- inch screen, retained on 10-mesh sieve 



Passing 10-mesh sieve, retained on 20-mesh sieve. . . 

 Passing 20-mesh sieve, retained on 30-mesh sieve . . . 

 Passing 30-mesh sieve, retained on 40-mesh sieve. . . 

 Passing 40-mesh sieve, retained on 50-mesh sieve . . . 

 Passing 50-mesh sieve, retained on 80-mesh sieve . . . 

 Passing 80-mesh sieve, retained on lOO-mesh sieve. . 

 Passing lOO-mesh sieve, retained oq 200-mesh sieve. 

 Passing 200-mesh sieve 



Total. 



Per cent. 

 7.1 



13.3 



11.4 

 11.7 

 13.1 

 8.5 

 9.6 

 11.0 

 8.5 

 6.1 

 1.1 

 3.0 

 2.7 



Per cent. 

 7.6 



5.8 



0.0 



4.0 



4.7 



9.7 



15.5 



12.5 



7.2 



9.6 



10.6 



8.1 



5.9 



.6 



3.0 



2.8 



100.0 



100.0 



EXPEKIMENT No. 12. — ^BITUMINOUS GrAVEL CONCRETE. 



Oil-Asphalt Y. 



Pit-Run Gravel with 



Location: Station 126-f 95 to station 153-f 00. 



Total length: 2,605 feet. 



Total area: 4,711.1 square yards. 



This experiment was exactly the same as experiment No. 9. 



Experiment No. 13. — Bituminous Macadam (Penetration Method). 



WITH Oil-Asphalt X. 



Trap Rock 



Location: Station 153+50 to station 163-1-00. 



Length: 950 feet. 



Total area: 1,688.9 square yards. 



The base for the surface experiment was an old bituminous- 

 macadam road, which was scarified, reshaped, and rolled with a 

 10-ton roller. The old road crown varied from 2 to 6 inches, but 

 was reshaped without difficulty. From stations 153 + 53 to 158 + 50 



