DUST PREVENTION AND ROAD PRESERVATION, 1915. 37 
Table 39.— Analysis of residual asphaltic petroleum used at Buena Vista, Fla. 
Specific gravity 25°/25° C 0. 992 
Viscosity, Engler, 50 c. c. at 100° C. specific 31. 5 
Float test at 32° C, time 2' 44" 
Float test at 50° C, time y 04" 
Loss at 163° C. 5 hours, 20 grams, per cent 75 
Float test of residue at 50° C, time. . , ]/ 30" 
Per cent of total bitumen insqluble in 86° B. naphtha 13. 02 
Fixed carbon, per cent 8, 20 
Soluble in CS 2 (total bitumen), per cent 99. 91 
Organic matter insoluble, per cent 09 
Inorganic matter insoluble, per cent 00 
Total, per cent 100. 00 
Table 40. — Cost data on construction of coralline-rock road. 
Materials used : 
No. 2 stone, cubic yard per square yard 0. 083 
Sand, cubic yard per square yard 014 
Bitumen, gallon per square yard 906 
Coat per square yard : 
No. 2 stone $0. 1546 
Bitumen 1243 
Spreading No. 2 stone 0175 
Heating and applying bitumen 0075 
Spreading sand 0105 
Rolling 0079 
General expense 0186 
Total 3409 
?otal costs for surface: 
Quarrying and crushing No. 2 stone, 227 cubic yards 302. 85 
Loading and hauling No. 2 stone to road 118. 00 
Spreading No. 2 stone 47. 50 
Bitumen on siding, 2,465 gallons 330. 31 
Unloading and hauling bitumen to road 8. 00 
Heating and applying bitumen 20. 40 
Spreading sand, 38 cubic yards \ 28. 75 
Rolling 21. 60 
General expense 50. 60 
Total 928. 01 
)st of preliminary work: 
Grading 132. 11 
Shaping subgrade, 2,722 square yards 51. 65 
Gathering and hauling foundation stone, 454 cubic yards 125. 90 
Spreading and sledging foundation stone 95. 00 
Rolling foundation stone 10. 80 
Total 415.46 
