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