The water–cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix and has an important influence on the quality of concrete produced.
- A lower water-cement ratio leads to higher strength and durability, but may make the mix more difficult to place.
- Placement difficulties can be resolved by using plasticizers or super-plasticizers.
- Maximum 0.50 water-to-cement ratio (1:2) when concrete is exposed to freezing and thawing in a moist condition or to de-icing chemicals, and a maximum 0.45 water to cement ratio for concrete in severe or very severe sulphate conditions.
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