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In: Civil Engineering

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

In regards to the mix design of concrete, respond to each of the following by showing detailed calculations. Use the tables and figures below.

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

2. If the target mean strength of concrete = 30 MPa 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 maximum aggregate size = 10 mm, assume using crushed gravel and uncrushed sand, what is the value of the free water?

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

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

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Expert Solution

Ally Wells answered 2 weeks ago
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