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ASTM-C33. <br /> PERCENT BY WEIGHT OF COARSE AGGREGATE PASSING <br /> SQUARE-OPENING LABORATORY SIEVES <br /> Size No. 11/2 in. 1 in. 1/2 in. No.4 No.8 <br /> 57 100 95-100 25-60 0-10 0-5 <br /> The above gradation represents the extreme limits for the various sizes indicated, <br /> which will be used in determining the suitability for use of coarse aggregate from all <br /> sources of supply. For any grade from any one source, the gradation shall be held <br /> reasonably uniform and not subject to the extreme percentages of gradation <br /> specified above. <br /> 3. Fine aggregate: Silica sand or Miami Oolitic rock screenings. <br /> a. Fine aggregate shall be free from lumps of clay, soft or flaky <br /> particles, salt, alkali, organic matter, loam or other extraneous <br /> substances. The weight of extraneous substances shall not exceed <br /> the following percentages: <br /> Material passing the No. 200 sieve 4.0 <br /> Shale 1.0 <br /> Coal and lignite 1.0 <br /> Clay lumps 1.0 <br /> Cinders and clinkers 0.5 <br /> In addition, the sum of the percentages of all materials listed in the above <br /> table shall not exceed five. <br /> b. Fine aggregate will be subjected to the colorimetric test for organic <br /> impurities, and if the color produced is darker than the standard solution, <br /> the aggregate will be rejected unless it can be shown by appropriate tests <br /> that the impurities causing the color are not of a type that would be <br /> detrimental to the concrete. Such tests shall be in accordance with AASHTO <br /> Methods T71 and M6. <br /> c. Silica sand fine aggregate shall be reasonably well graded, from coarse to <br /> fine and when tested by means of laboratory sieves, it shall meet the <br /> following requirements in percent of total weight: <br /> Total Retained On: <br /> Sieve Percent <br /> 08/12 03305-7 11-4179 <br />