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AMERICAN SOCIETY FOR TESTING MATERIALS PHILADELPHIA, PA., U S A AFFILIATED WITH THE International Assocmtion for Testing Materials STANDARD TEST FOR ABRASION OF ROAD MATERIAL Serial Designation: D 2-08 This test is issued under the fixed designation D 2; the final number indicates the year of original issue, or in the case of revision, the year of last revision Adopted, 1908, This well-known test is similar in almost all respects to the Deval abrasion test of the French School of Roads and Bridges It has been used since 1878, and is entirely satisfactory for the purpose for which it was designed Abrasion Test The machine shall consist of one or more hollow iron cylin- ders; closed at one end and furnished with a tightly fitting iron cover at the other; the cylinders to be 20 cm in diameter and 34 cm in depth, inside These cylinders are to be mounted on a shaft at an angle of 30 deg with the axis of rotation of the shaft At least 30 lb of coarsely broken stone shall be available for a test The rock to be tested shall be broken in pieces as nearly uniform in size as possible, and as nearly 50 pieces as possible shall constitute a test sample The total weight of (524) Serial Designation: D 2-08 525 rock in a test shall be within 10 g of 5 kg All test pieces shall be washed and thoroughly dried before weighing Ten thousand revolutions, at the rate of between 30 and 33 per minute, shall constitute a test Only the percentage of material worn off which will pass through a 0.16-cm (j^-in.) mesh sieve shall be considered in determining the amount of wear This may be expressed either as the percentage of the 5 kg used in the test, or the French coefficient, which is in more general use, may be WW— given: that is, coefficient of wear = 20 X — = , where w is the weight in grams of the detritus under 0.16 cm (-^ in.) in size per kilogram of rock used