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Mica and Limestone

What is the a...

Question

What is the approximate ratio of the strength of cement concrete at 7 days to that at 28 days curing?

0.40

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0.65

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0.90

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1.15

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Solution

The correct option is B 0.65
$7 d a y s s t r e n g t h ≅ \frac{2}{3} o f 28 d a y s s t r e n g t h$ .

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