# Abrams law formulated in 1919 states that the strength of concrete varies inversely with the water/cement ratio. Which of the following condition need

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Abrams law formulated in 1919 states that the strength of concrete varies inversely with the water/cement ratio. Which of the following condition needs to be satisfied for this law to be applicable?
1. Cement should  of good quality
2. Water should be clean
3. Compaction should be carried out with needle vibrators
4. Chemical admixtures must be used
5. The concrete should be fully compacted

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Correct Answer - Option 5 : The concrete should be fully compacted

In 1919, Abrams' law states that "Assuming full compaction, and at a given age and normal temperature, the strength of concrete can be taken to be inversely proportional to the water-cement ratio."

$σ = \frac{A}{{{B^{w/c}}}}$

where,

σ = compressive strength of concrete

A, B = constants

w/c = mass ratio of water to cement