. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DUST PREVENTION AND KOAD PRESERVATION. Table 1.—Description of various sections of experiment No. 3. Section. Location (stations). Paint coat. Carpet coat. From— To— A 12+50 15+00' 17+50 20+00 21 + 25 22+50 25+00 26+50 28+00 29+50 15+00 17+50 20+00 21+25 22+50 25+00 26+50 28+00 29+50 30+90 Refined coal tar. B do Water-gas tar preparation No. 2. Fluxed native asphalt No. 2. C do D Water-gas tar preparation No. 1. Native asphalt emulsion Water-gas tar preparation No. 1. Do. E Fluxed native asphalt No. 1. F Oil-asphalt No
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DUST PREVENTION AND KOAD PRESERVATION. Table 1.—Description of various sections of experiment No. 3. Section. Location (stations). Paint coat. Carpet coat. From— To— A 12+50 15+00' 17+50 20+00 21 + 25 22+50 25+00 26+50 28+00 29+50 15+00 17+50 20+00 21+25 22+50 25+00 26+50 28+00 29+50 30+90 Refined coal tar. B do Water-gas tar preparation No. 2. Fluxed native asphalt No. 2. C do D Water-gas tar preparation No. 1. Native asphalt emulsion Water-gas tar preparation No. 1. Do. E Fluxed native asphalt No. 1. F Oil-asphalt No. I. G H do Water-gas tar preparation No. 2. Fluxed native asphalt No. 2. I do J. do Oil-asphalt No. 2. Analyses of the various materials used are given in Tables Nos. 2 and 3. A sample of the asphaltic emulsion was not obtained, but it was the same product as was used on section No. 11 of the 1911 project and reported in Circular No. 99. For a paint coat the emulsion was diluted with an equal volume of water. From station 33+60 to station 34 + 15 the concrete was given a paint coat of the crude water-gas tar, the analysis of which is given in Table 2. The application was made at the rate of approximately gallon per square yard. It was absorbed to a slight extent and soon dried, and was distinctly evident as a brown stain on the surface when last inspected. Table 2.—Analyses of tar products used in surface treatment of i Clear. 2 One-half solid, s Cloudy. * Three-fourths solid. » Two-thirds solid, e Two-fifths solid. 1 Solid. 8 Clear. Showed per cent insoluble in dimethyl sulphate. A 315°-350° C. fraction showed per cent, and a350°-375° C. fraction showed per cent insoluble in dimethyl sulphate. 9 Clear. Thisjraction, and also a 315°-350° C. fraction and a 350°-375° C. fraction each showed per cent insoluble in dimethyl Please note that these images are extracted from scanned page images that may have been digitally en
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