Question

3) Three aggregate stockpiles are designated as A, B, and C a) Determine an aggregate blend of stockpiles A, B, and C that meets specifications. b) Plot the gradations of the aggregate blend you produced in part (a) as well as the specifications (lower and upper limits) on 0.45 power gradation chart. Sieve size Stockpile A Stockpile B Stockpile C Specification % Passi %P 100 100 100 3/4" or 19.0 mm 100 5/8" or 16.0 mm 60 1/2" or 12.5 mm 40 3/8" or 9.5 mm 4"r 6.3 mm # 4 or 4.75 mm #80r 2.36 #10 or 2.0 mm # 40 or 0.425 mm 100 100 100 100 100 100 100 90 100 75-90 55-75 20 40 30-42 11-24 3.0-7.0 60 | #200 or 0.075 mm- 10 4) Determine the specific surface area (SA) of the aggregate you produced in Q#3. 5) The following are the results of gradation tests on three aggregates. Combine them to the gradation required. What are the combined specific gravity and absorption values? Percent Passing Aggregate A Aggregate B Aggregate C Required 100 100 93 100 100 100 95 100 100 95 19 mm 9.5 mm 4.75 mm 2.36 mm 600 μm 300 um 75 μm Absorption Specific Gravity 32 36 28 0.8% 2.600 0.5% 12% 2.750 2.700

Answer 1

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