Articoli correlati a Standard and tentative methods of sampling and testing...
Standard and tentative methods of sampling and testing highway materials; recommended by the Second Conference of State Highway Testing Engineers and Chemists, Washington, D.C., Feb. 23-27, 1920 - Brossura
Sinossi
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...at any time more than 2 C. The sample is then removed from the oven, allowed to cool, and reweighed. From the difference between this weight and the total weight before heating the percentage of loss on the amount of material taken is calculated. The general appearance of the residue should be noted, especially with regard to any changes which the material may have undergone. Some relative idea of the amount of hardening which has taken place may be obtained from the results of a float or penetration test made on the residue, as compared with the results of the same test on the original sample. Tt is also frequently desirable to make the specific gravity and other tests on the residue for the purpose of identifying or ascertaining the character of the base used in the preparation of cut-back products. Before any tests are made on the residue, it should be melted and thoroughly stirred while cooling. i Ig. 19.--New York Testing Laboratory oven. Highly volatile and nonvolatile materials should not be subjected to this test at the same time in the same oven owing to a tendency on the part of the latter to absorb some of the volatile products of the former. 24. FLASH AND BURNING POINT TESTS. The open-cup oil tester consists of a brass oil cup, a, (Fig. 20) of about 100 c. c. capacity. The outer vessel, b, serves as an air jacket. No glass cover is used in the open-cup method. A suitable thermometer, c, is suspended from the wire support, d, directly over the center of the cup so that its bulb is entirely covered with oil but does not touch the bottom of the cup. The testing flame is obtained from a jet of gas passed through a piece of glass tubing, and should be about 5 millimeters in length. The test is made by first filling the oil cup with the material under...
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