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ABRAMS WATER CEMENT RATIO LAW:

Abrams water-cement ratio law states that for any given conditions of test,the strength of workable concrete mix is dependent only on the water-cement ratio. it follows from this law that provided the concrete is fully compacted,the strength is not affected by aggregate shape,type or surface texture,or the aggregate grading,the workability and the richness of mix.we know that workablilty of mix determine the amount of useful internal work necessary to produce full compaction is dependent the amount of water in the mix, but amount of water in the mix,corresponding to on the amount of water in the mix,but amount of water in a mix,corresponding to a given strength, is governed by the water-cement ratio law,hence the only way to increase the quantity of water to increase the workability of the mix to increase the amount of cement also,how ever as the grading of aggregate does not affect. the strength of the concrete directly, the object must be to choose the grading to give the best workablity with lowest water content,the grading of the particles should,therefore,be such that in the fully compacted state the total surface area