ASTM D72-21 Test Method for Amount of Material Finer than 200 Sieve in Aggregate

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STANDARD METHOD OF TEST FOR FOR QUANTITY OF CLAY AND SILT IN GRAVEL HIGHWAY CONSTRUCTION Serial Designation: D 72 - 21 This method is issued under the fixed designation D 72; the final number indicates the year of original adoption as standard, or in the case of revision, the year of last revision · PROPOSED AS TENTATIVE, 1920; ADOPTED, 1921 1 This test covers the detennination of the quantity of Scope clay and silt in natural gravel to be used in highway construction 2 The sample as received shall be moistened and thoroughly Treatment of m1·xed, t·11en dn·ed to constant we1·gh t at a temperature between Sample 100 and 110° C (212 and 230° F.) 3 The pan or vessel to be used in the determination shall Apparatus be 12 in (30.5 cm.) in diameter by not less than 4 in (10.2 cm.) deep, as nearly as may be obtained 4 (a) A representative portion of the dry material weighing Procedure not less than 50 times the weight of the largest stone in the sample shall be selected from the sample and placed in the pan which has been dried and accurately weighed (b) Sufficient water shall be poured into the pan to cover the gravel The gravel shall be agitated vigorously for ts seconds with a trowel or stirring rod After it has settled for 15 seconds the water shall be poured off into a tared evaporating dish, care being taken not to pour off any gravel This is repeated until the wash water is clear The washed material shall be dried to constant weight in an oven at a temperature between 100 and 110° C (212 and 230° F.), weighed, and the net weight of gravel determined 5 The percentage of clay and silt shall be calculated from Percentage of Clay the formula: P ercentage of Clay and Silt = Original weight-weight after washing X 100 Original weight 6 For a check on the results, the wash water shall be Check Determinati&n evaporat~d to dryness and the residue weighed: Percentage of Clay and Silt Weight of residue X 100 Original weight (719)