. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 50 BULLETIN 586, U. S. DEPARTMENT OF AGRICULTURE. Table 51.—Analysis of refined tars used in re-treatment of experiments Nos. 1 and 2, Rockville Pike. Experiment No. 1. Experiment No. 2. Bituminous material. Characteristics Specific gravity 25725° C Float test 32° C, seconds Specific viscosity, Engler 50 c. c, 50° C. Per cent free carbon Coal tar refined. Viscous, sticky. 135 Water-gas tar re- fined. Viscous, sticky. Per cent by volume. Distillation: First light oils (to 110° C.) Second
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 50 BULLETIN 586, U. S. DEPARTMENT OF AGRICULTURE. Table 51.—Analysis of refined tars used in re-treatment of experiments Nos. 1 and 2, Rockville Pike. Experiment No. 1. Experiment No. 2. Bituminous material. Characteristics Specific gravity 25725° C Float test 32° C, seconds Specific viscosity, Engler 50 c. c, 50° C. Per cent free carbon Coal tar refined. Viscous, sticky. 135 Water-gas tar re- fined. Viscous, sticky. Per cent by volume. Distillation: First light oils (to 110° C.) Second fight oils (110° to 170° C). Heavy oils (170° to 270° C.) Heavy oils (270° to 300° C.) Pitch residue Total. Per cent by weight. Per cent by volume. 3 2 Per cent by weight. .08 i Solid. 2 Clear. 3 Cloudy. Experiment No. 3—AspTidltic petroleum, cold application.—The ac- tion of this experiment is so well known that little description is necessary. Its conduct during the winters of 1915 and 1916 was thoroughly characteristic, and in June, 1916, it became necessary to re-treat as usual. The work was done by hand, as described in the last report, using the same bituminous material originally applied with torpedo sand as top-dressing. Table 52 shows the character- istics of the bituminous material and cost data will be found in Table 53. All bottoms and all but the better drained slopes were thoroughly wet; one or two breaks had occurred near the top of the hill 600 feet from the south end of the experiment. The necessity for patching and re-treating during the following summer was evident. Table 52.—Analysis of asphaltic petroleums used in re-treatment of experiments Nos. S and 7, Rockville Pike. Specific gravity 25°/25 ° C Flash point (° C.) Burning point (° C.) Specific viscosity, Engler, 50 c. c, 25° C Loss at 163° C, 5 hours, 20 grams, per cent Float t
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