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 . s per whole inch of the warpwires and between 19 and ,21 wires per whole inch of the shoot wires. The diameterof the wire should be inch and the average diameter shall not be outside thelimits of and inch. The No. 30 sieve shall have between and wires per whole inch of the warpwires and between and wires per whole inch of the shoot wires. The diameterof the wi
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 . s per whole inch of the warpwires and between 19 and ,21 wires per whole inch of the shoot wires. The diameterof the wire should be inch and the average diameter shall not be outside thelimits of and inch. The No. 30 sieve shall have between and wires per whole inch of the warpwires and between and wires per whole inch of the shoot wires. The diameterof the wire should be inch, and the average diameter shall not be outside thelimits 0. 0105 to inch., SAMPLING AND TESTING HIGHWAY MATERIALS. 27 (55) Immediately after mixing, the standard mortar shall be placed in the molds,pressed firmly with the thumbs, and smoothed off with a trowel without mortar shall be heaped above the mold, and smoothed off with a trowel; thetrowel shall be drawn over the mold in such a manner as to exert a moderate pressureon the material. The mold shall then be turned over and the operation of heaping,thumbing, and smoothing off Fig. 13.—Form of briquette as recommended by the committee on uniform tests of cement of the American Society of Civil Engineers. (56) Tests shall be made with any standard machine. The briquettes shall be testedas soon as they are removed from the water. The bearing surfaces of the clips andbriquettes shall be free from grains of sand or dirt. The briquettes shall be carefullycentered and the load applied continuously at the rate of 600 pounds per minute. (57) Testing machines should be frequently calibrated in order to determine theiraccuracy. (58) Briquettes that are manifestly fault}-, or which give strengths differing morethan 15 per cent from the average value of all tests pieces made from the same sample
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