aggregate test

aggregate test - Executive Summary TO: Grace Hsuan FROM:...

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Executive Summary TO: Grace Hsuan FROM: SUBJECT: Aggregate Test DATE: February 6, 2008 Per your request, I have analyzed the angular, fine and coarse aggregates. The coarse aggregate was determined to have a bulk specific gravity of 3.808, saturated surface-dried bulk specific gravity of 4.564, apparent specific gravity of 15.656, and absorption of 19.88%. All these values are higher than the fine aggregate due to the grain size. The fine aggregate was determined to have a bulk specific gravity of 2.594, saturated surface- dried bulk specific gravity of 2.625, apparent specific gravity of 2.677, and absorption of 1.20%. Due to the small grain size of the fine aggregates, the unit weight of the fine aggregate is larger, 1845 kg/m 3 than the unit weight of the coarse aggregate at 1654 kg/ m 3 . Through sieve analysis, the angular coarse aggregate was not suitable according to ASTM standards for number 56 aggregate. This is most likely due to the fact that angular aggregate does not move through square openings in sieves as well as rounded aggregate. This resulted in the aggregate appearing to be open grade. The fine aggregate is suitable according to ASTM standards. The fine aggregate is also well graded, which contributes to it being suitable for use.
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Description of Test Procedures: Bulk and Apparent Specific Gravity and Absorption of Course Aggregates 1) Dry the aggregate to a constant weight then measure sample A. Then immerse aggregate in room temperature water for about a day. 2) Remove sample from water and dry with a paper towel. Weigh saturated surface- dry condition, sample B. 3) Immediately place saturated surface-dry condition in container and determine its weight in water, sample C. Bulk and Apparent Specific Gravity and Absorption of Fine Aggregates 1) Immerse aggregate in room temperature water for about a day 2) Drain water and spread flat on a nonabsorbent surface, then expose gently moving warm air while stirring frequently. Continue until aggregate is free flowing. Measure saturated surface-dry condition (S). 3) Partially fill cylindrical measure with water and immediately introduce SSD fine aggregate. Fill water to about 90% capacity. Agitate to eliminate air bubbles. Fill cylinder to capacity. Determine total weight of measure plus sample and water (C). 4) Remove and retain contents and determine the weight of the full measure of only room temperature water (B). 5) Dry the retained test sample to a constant weight using a microwave and measure
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aggregate test - Executive Summary TO: Grace Hsuan FROM:...

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