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 . percentage itwill be necessary to evaporate before cooling and taking a penetration of the residue. Ss*. Fig. 23.—Engler viscosimeter. 46 BULLETIN 040, TJ. S. DEPARTMENT OF AGRICULTURE. It is sometimes necessary to make several trials before the desired result is obtained,When the required penetration is reached, the residue left from evaporation is weighedand its per cent of the original sample take
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 . percentage itwill be necessary to evaporate before cooling and taking a penetration of the residue. Ss*. Fig. 23.—Engler viscosimeter. 46 BULLETIN 040, TJ. S. DEPARTMENT OF AGRICULTURE. It is sometimes necessary to make several trials before the desired result is obtained,When the required penetration is reached, the residue left from evaporation is weighedand its per cent of the original sample taken is computed. 29. TEST FOR PENETRATION OF BITUMINOUS MATERIALS. (A. S. T. M. Standard Method, Serial Designation: D 5-16.)I. DEFINITION. (1) Penetration is defined as the consistency of a bituminous material expressed asthe distance that a standard needle vertically penetrates a sample of the materialunder known conditions of loading, time, and temperature. Where the conditionsof test are not specifically mentioned, the load. time, and temperature are understoodto be 100 grams. 5 seconds. 25° C (77° P.), respectively, and the units of penetrationto indicate hundredths of a
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