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Concrete - Water to Cement Ratios

Water vs. cement ratio when mixing concrete.

water cement mix

Water to cement ratio is the ratio of

weight of water to the weight of cement

used in a concrete mix and can be expressed as

r = wh20 / wc

  = 8.33 qH20 / wc                             (1)

where 

r = water to cement ratio

wh20 = weight of water (lbs)

w= weight of cement (lbs)

qH20 = volume of water (US gallon)

Example - Water to Cement Ratio

A batch of concrete has 45 gallons of water and 900 lbs of cement. The water to cement ratio can be calculated as

r = 8.33 (45 gallons) / (900 lbs)

  = 0.42 

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