### Concrete Mix Ratios - Cement Sand Aggregate and Water

Concrete mix ratio of 1:3:3 – On mixing 1 part cement 3 parts sand with 3 parts aggregate produces concrete with a compressive strength of 3000 psi. On mixing water with the three ingredients a paste is formed that binds them together till the concrete mix gets hardened. The strength concrete is inversely proportional to the water/cement ratio.

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