The strength of concrete mainly depends on

quality of coarse aggregates

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water cement ratio

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fineness of cement

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quality of fine aggregates

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Solution

The correct option is B water cement ratio
Water cement ratio is a most important indicator of strength. Lower the water cement ratio higher is the final concrete strength

Factor Low w/c ratio high w/c ratio

Strength High Low

Permeability Low High

Shrinkage Low High

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