Concrete - Water to Cement Ratios
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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)
wc = 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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