The water to cement ratio is the most important factor in concrete strength.

The ratio is, as it’s name implies, the ratio of water to cement.

$latex w/c\: ratio = \frac{weight\: of\: water\: (lbs)}{weight\: of\: cement\: (lbs)}&s=2$

If you can measure the volume of water, a common conversion is:

$latex Weight\: of\: Water\:(lbs)\: =\: 8.33\cdot Volume\: of\: Water\: (US\: Gallons)$

The higher the water cement ratio, the lower the strength. But the lower the ratio, the more difficult it is to place and consolidate, which is an important consideration.

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