Water cement : Hydraulic cement.

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Taxonomy
water-cement ratio, concrete, cement, ratio, free encyclopedia, cement ratio, sand, stone, hydration reaction, hardened concrete, concrete mix, influence, cement content, pozzolans, microscopic pores, holes, corners, concrete piers.

Defination from the web:
water-cement ratio was developed by Duff A. Abrams and first published in 1918. Concrete hardens as a result of the chemical reaction between cement and water (known as hydration). For every 4 lbs of cement, 1 lb of water is needed to fully complete the reaction. ...