Problem 4. Concrete mix design Problem (60 points) The specific compressive stre

Question

Problem 4. Concrete mix design Problem (60 points) The specific compressive strength (or design strength) of concrete, fe'=3500 psi The concrete is used for casting 4 ½ inch thick slab and the spacing between reinforcement bars in the slab will not less than 12 inch. Type I cement will be used for mixing concrete (Fill answer in following blank) 1. What is the slump required for the concrete? (5 points) 2. What is the maximum size of coarse aggregate that can be used for the concrete? 3. If the slab is supposed to be exposed to environment, should be non-air-entrained 4. What is the amount of water in lbs. should be used for mixing I cubic yard be used for (5 points) concrete with 1% air content or air-entrained concrete with air content of 5% selected for the project?(5 points) concrete? mixing concrete? (5 points) 5. What is the maximum permissible water/cement ratio (w/c) that can (5 points) The specific gravity of coarse aggregate, SG 2.69. The specific gravity of fine c gravity of cement. SG, 3.15. Bulk density of dry- aggregate, SG 2.65. The specifi rodded of coarse aggregate, Baa-105 pef. Water density, D. 62.4 pcf. Determine the amount of coarse aggregate in lbs that is needed for mixing 1 cubic yard concrete (show calculation procedures) (10 points) 6. 7. Determine the amount of fine aggregate in lbs that is needed for mixing I cubic rd concrete (show calculation procedures) (10 points)

Explanation / Answer

1.The slump required for the concrete is 1-3inch.

2.Maximum size of coarse aggregate that can be used for the concrete is 9inch.

3.If the slab is supposed to exposed to environment, should be air entrained concrete with air content of 5 %.

4.Amount of water used for mixing 1 cubic yard concrete is 305 lbs.

5.Maximum permissible water cement ratio that can be used for mixing concrete is 0.54

3.

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