24 



BULLETIN" 257, TJ. S. DEPARTMENT OP AGRICULTURE. 



Distillation: 



Water per cent 



First light oils to 110° C do . . 



Second light oils (110°-170° C.) do. . . . 



Heavy oils (170°-270° C.) da. . . 



Heavy oils (270°-315°C.) do... 



Pitch residue do. . . 



By vol- By 

 •ume. weight. 



J 0.1 



0.1 



K$ 



.4 



'1.1 



.8 



!23.1 



20.0 



2 10. 5 



9.5 



3 64. 6 



68.8 



Total. 



.do. . 



100.0 99.6 



Table 17. — Analyses of asphallic petroleums used on sections Nos. 2 and 4, Washington, 



D. C, 1914. 



Section Section 



No. 2. No. 4. 



Specific gravity 25°/25° C 0.957 0.936 



Flash point - - - - ° C . . 38 30 



Burning point ° C . . 70 68 



Viscosity, Engler, 50 c. c. at 25° C., specific 104. 5 87. 5 



Loss, 5 hours at 163° C, 20 grams per cenj;. . 26. 66 24. 01 



Float test on residue at 32° C. (time). 5' 14" 6 / 22" 



Float test on residue at 50° C. (time) V 39" V 41" 



Percentage of total bitumen insoluble in 86° B. naphtha 8. 04 13. 94 



Fixed carbon per cent. . 4. 93 7. 10 



99.91 



99.89 



.07 



.10 



.02 



.01 



Soluble in CS 2 (total bitumen) do. 



Organic matter, insoluble do . 



Inorganic matter, insoluble do . 



Total do .... 100. 00 100. 00 



In the computation of cost data for the renewal surface treatment, 

 shown in Table 18, the following unit prices were used: 



Laborer, per 7 J-hour day : $1. 75 



Cart, per 7|-hour day '. 3. 50 



Sand, per cubic yard, on work 1. 64 



Bituminous material (per gallon) : 



Section 1 100 



Section 2 099 



Section 3 085 



Section 4 0775 



Table 18. — Materials and' cost data for renewal surface treatments, Department of Agri- 

 culture Grounds, Washington, D. C., May 14-20, 1914. 





Bituminous material. 



c8 

 >> 

 <D 

 t-t 

 03 

 3 

 a 1 



(3 



< 



Quantity of 



materials 



per square 



yard. 



Cost per square yard (cents). 



6 

 a 



o 



££ 

 3 o 



15 



3 



3 . 

 o'w' 



el 



03 

 OQ 



i 



a 



| 

 3 



§ 



OQ 



a 



03 



1 

 ho 



.a 



a 



5 



o 



<£ 

 s 



be 



.a 

 & 



P3 



ft'3 . 

 03 S — 



■d-a'E 



CO 03 

 btSaS 



=§£§ 



3flO 

 o3 ftC 



w 



ft 



03 . 



il 



to 



1-9 



a >> 

 §■& 



o 



I 



'1 



03 



o 

 E-i 



1 



2 

 3 



4 



Water-gas tar preparation. 



Asphaltic petroleum 



Residual petroleum 



Asphaltic petroleum 



1,363 



1,095 



706 



1,321 



0.177 

 .137 

 .184 

 .145 



0.0063 

 .0063 

 .0063 

 .0065 



1.770 

 1.36 



1.565 

 .133 



1.035 

 1.033 

 1.034 

 1.066 



0.205 

 .234 

 .165 

 .106 



0.000 

 .192 

 .198 

 .123 



0.479 

 .330 

 .644 

 .459 



0.538 

 .287 

 .545 



.441 



0.034 

 .085 

 .066 

 .053 



4.061 

 3.521 

 4.217 

 3.381 



i Clear. 



2 Clear, showed 0.0 per cent insoluble in dimethyl sulphate. 



3 Soft, sticky, semisolid; a 315°-350° C. fraction showed 27.5 per cent, and a 350°-375° C. fraction showed 

 32.5 per cent insoluble in dimethyl sulphate. 



