Standard and tentative methods of sampling and testing highway materials : recommended by the Second Conference of State Highway Testing Engineers and Chemists, Washington, , Feb 23-27, 1920 . lsions are per cent of water and quality of percentage of water may be obtained by the methods of water determinationsin test No. 34 without the addition of naphtha or benzol. The emulsioncan be broken SAMPLING AND TESTING HIGHWAY MATERIALS. 59 down by the addition of a 10 per cent solution of calcium chloride. The separatedbituminous material is then kneaded by hand to separate all conta
Standard and tentative methods of sampling and testing highway materials : recommended by the Second Conference of State Highway Testing Engineers and Chemists, Washington, , Feb 23-27, 1920 . lsions are per cent of water and quality of percentage of water may be obtained by the methods of water determinationsin test No. 34 without the addition of naphtha or benzol. The emulsioncan be broken SAMPLING AND TESTING HIGHWAY MATERIALS. 59 down by the addition of a 10 per cent solution of calcium chloride. The separatedbituminous material is then kneaded by hand to separate all contained water and thensubjected to the usual quality tests. 37. DETERMINATION OF PARAFFIN SCALE. It is recommended that the paraffin scale determination be omitted on account ofdifficulty encountered in obtaining dependable results due to the inaccuracy of anymethods which have heretofore been introduced. 38. STANDARD METHOD FOR DISTILLATION OF CREOSOTE. (Extract from A. S. T. M. Standard Method, Serial Designation: D 38-1S.) (1) (a) Retort.—This shall be a tubulated glass retort of the form and approximatedimensions shown in figure 32, with a capacity of 250 to 290 c. c. The capacity shall. Fig. -Asbestos shield. be measured by placing the retort with the bottom of the bulb and the end of theofftake in the same horizontal plane, and pouring water into the bulb through thetubulature until it overflows the offtake. The amount remaining in the bulb shall beconsidered its capacity. (b) Condenser tube.—The condenser tube shall be a suitable form of tapered glasstubing of the following dimensions: Mm Diameter of small end (permissible variation, mm.) Diameter of large end (permissible variation, 3 mm.) Length (permissible variation, 4 mm.) 28. 5 3(50. 0 60 BULLETIN 949, U. S. DEPARTMENT OF AGRICULTURE. (c) Shield.—An asbestos shield of the form and approximate dimensions shown infigure 33 shall be used to protect the retort from air currents and to prevent
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectroadmat, bookyear1921
