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What is the minimum water cement ratio required to complete chemical reaction in a concrete mix ?

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Question added by Appi Reddy Kothapally , Chief Structural Consultant , self employed
Date Posted: 2014/11/22
Mohamed Galal Hussein Ahmed Mohamed
by Mohamed Galal Hussein Ahmed Mohamed , Technical Mnager , Fast Building Contracting Co.

Minimum water cement ratio's necessary for hydration of cement range is from 0.19 to the mid-twenties (i.e.0.26). The additional water added to cement, sand and rock beyond that needed for hydration of the cement is water added for convenience. This means we need a certain amount of extra water in the mix to get the workability needed for placement and finishing. This extra water in the mix that is not used in hydration remains throughout the cement paste to evaporate at some later time. Higher water-Cement ratios cause the cement paste to become more porous. The more porous the cement paste, the weaker and less durable the concrete.

Shofikur Rahman
by Shofikur Rahman , Assistant General Manager , Borak Reak Estate Ltd.

water cement ratios of .45 to .60 are more typically used. Minimum water cement ratio is .38.

Milorad Mandiç
by Milorad Mandiç , Site engineer, construction superintendant , DenezaM

about0.24

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