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In regards to the mix design of concrete, respond to each of the following by showing...

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Civil Engineering

In regards to the mix design of concrete, respond to each of thefollowing by showing detailed calculations. Use the tables andfigures below.

1. If the concrete characteristic strength = 40MPa, with 2.5% defective test results, what will be the target meanstrength?

2. If the target mean strength of concrete = 30MPa at 28 days, the coarse aggregate is uncrushed, using GP(General Purpose) cement, what is the water cement ratio W/C?

3. If the concrete slump = 8 mm, the maximumaggregate size = 10 mm, assume using crushed gravel and uncrushedsand, what is the value of the free water?

4. If aggregate specific gravity = 2.7, freewater content = 180 kg/m3, cement content = 300kg/m3, W/C = 0.6, % passing 600 μm sieve = 0.6, slump =20 mm, maximum aggregate size = 10 mm, what is the content of fineaggregate?

5. If cement content = 300 kg/m3,water content = 180 kg/m3, gravel content = 1100kg/m3, sand content = 750 kg/m3, how are themix proportions represented by ratio?

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