56 



BULLETIN 407, TJ. S. DEPARTMENT OP AGRICULTURE. 



The section was first patched in the same manner as section 2 and 

 then re-treated. To avoid, if possible, the marked deterioration of 

 this section during the winter, the material used on section 4 was 

 selected for this re-treatment, instead of the original material. The 

 cost of repairs was: 



Labor $7. 75 



Materials 5. 18 



Total 12. 93=$0. 0182 per square yard. 



Section No. 4. — Asphaltic Petroleum. 



Section 4 remained in generally good condition. It required no 

 preliminary repairs and was re-treated with the material originally 

 used. An analysis of the bituminous material used on section 3 and 4 

 is given in Table 57. 



Table 57. — Analysis of aspJialtic petroleums used on sections Nos. 2, 3, and 4, Wash- 

 ington, D. C, 1915. 



Section 2. 



Sections 3 

 and 4. 



Specific ^avlty '2&°12&° C 



Flash point °C 



Burning point °C 



Viscosity at 25° C, 50 cc. Engler specific 



Loss, 5 hrs. at 163° C, 20 grams, per cent. 



Float test on residue, 32° C. (time) 



Float test on residue, 50° C. (time) 



Percentage of total bitumen insoluble in 86° B. naphtlii 

 Fixed carbon, per cent 



Soluble in CS2 (total bitumen), per cent 



Organic matter insoluble in CS2, per cent 



Inorganic matter insoluble in CS2, per cent 



Total, per cent 



0.963 



31 



84 



128.4 



23.14 



2' 37" 



1'4" 



5.96 



4.62 



99.94 

 0.04 

 0.02 



100.00 



0.949 



30 



70 



94.8 



30.51 



4' 35" 



1' 23" 



14.03 



7.70 



99.90 

 0.05 

 0.05 



Table 58. — Quantities and costs of re-treatments per square yard. 



















Costs (materials). 



Section No. 



Area. 



Bitumen. 



Sand. 



Bitumen. 



Sand. 



Total ma- 

 twials. 



2 



Sq. yds. 

 1,129 

 711 

 1,330 



Gallon. 

 0.044 

 .229 

 .150 



Cu. yd. 

 0.003 

 .007 

 .007 



Cent. 

 0.0089 

 .0137 

 .0090 



Cent. 

 0.0044 

 .0114 

 .0122 



Cent. 

 0.0133 



3 ... 



.0251 



4 



.0212 









Costs (labor). 



Section No. 



Sweep- 

 ing. 



Pouring 

 oil. 



Broom- 

 iagoil. 



Spread- 

 ing sand. 



Hauling 

 sand. 



Superin- 

 tendence. 



Total 

 labor. 



Total 

 costs. 



3 



Cent. 



0.0018 

 .0048 

 .0011 



Cent. 



0.0015 

 .0014 

 .0007 



Cent. 



0.0039 

 .0057 

 .0024 



Cent. 



0.0012 

 .0024 

 .0012 



Cent. 



0.0039 

 .0046 

 .0008 



Cent. 



0. 0049 

 .0058 

 . 0052 



Cent. 



0.0172 

 .0247 

 .0014 



Cent. 

 0.0305 



2 



.0498 



4 



.0326 



























