Concrete  Water to Cement Ratios
Water vs. cement ratio when mixing concrete.
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 = w_{h20} / w_{c}
= 8.33 q_{H20} / w_{c} (1)
where
r = water to cement ratio
w_{h20 }= weight of water (lbs)
w_{c }= weight of cement (lbs)
q_{H20 }= 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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