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Specific Gravity and Absorption, Fine Aggregate - 14070_291

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Figure 13-17.—Items required for testing sand for organic matter. aggregate  and  the  percentage  of  absorption  are  as follows: 1. Dry a representative sample of the aggregate (approximately 5,000 grams) to a constant weight at 110°C. Then cool the sample for 1 to 3 hours, immerse it in water, and allow it to soak for about 24 hours. 2. Remove the sample from the water and dry it to a  saturated,  surface-dry  condition  by  rolling  the  sample in an absorbent cloth until visible films of water are removed and the particle surfaces appear slightly damp. 3.  Weigh  the  sample  in  the  SSD  condition  and record  the  weight  to  the  nearest  0.5  gram.  Then immediately place the sample into a container or wire basket and determine its immersed weight (or weight in water)  at  23°C.  Be  sure  that  any  entrapped  air  is removed by shaking the container or basket while it is immersed. Record the immersed weight to the nearest 0.5 gram. 4. Dry the sample to a constant weight at 110°C, cool it for 1 to 3 hours, and then weigh the oven-dried sample. Record the weight to the nearest 0.5 gram. 5. The bulk specific gravity (SSD condition) and the percentage of absorption can now be calculated using  the  following  formulas: And: Where: A = B    = C   = weight of oven-dried sample in air (in grams) weight of SSD sample in air (in grams) immersed  weight  of  saturated  sample  (in grams) Specific Gravity and Absorption, Fine Aggregate (ASTM C 128).— The  procedures  for  determining  the bulk specific gravity of the fine aggregate in a SSD condition  and  the  percentage  of  absorption  are  as follows: 1.  Dry  a  representative  sample  of  the  fine aggregate (about 1,000 grams) to a constant weight at 110°C. Then cool the sample, immerse it in water, and allow it to soak for about 24 hours. 2.  After  the  soaking  is  completed,  spread  the sample on a flat, nonabsorbent surface and stir it to obtain uniform drying. Continue drying the sample until it approaches a SSD condition. 13-25



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