The water cement ratio is defined as the ratio of water and cement (by weight or by volume) in a concrete mix. It is usually expressed in liters of water per bag of cement (50kg). After carried out a number of experiments by Duff Abraham he established a relationship between water and cement which is known as water cement ratio law. This law is valid only when the concrete is of workable plasticity. According to This law the strength of concrete wholly depends upon the amount of water used in the preparation of concrete mix and is quite independent of the proportion of cement and aggregates.
The strength of concrete is inversely proportional to the water cement ratio. In other words, the strength of concrete decrease as the water cement ratio increases. It may be noted that when the water cement ratiobecomes less than 0.45, the concrete is not workable and cause honey-combed structure containing a large number of voids. If the water cement ratio is more, then the capillary voids will be more in the physical structure of the hydrated cement. The strength and durability of concrete will also be less.
I hope that this article will help you to understand WHAT IS MEANT BY WATER CEMENT RATIO and its effects on strength of concrete.
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