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Effect of W/C Ratio on Strength

Abram's law f...

Question

Abram's law formulated an equation in 1919 which states that the strength of concrete varies inversely with the water/cement ratio. Which of the following conditions needs to be satisfied for this law to be applicable?

A

Cement should of good quality

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B

Water should be clean

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C

Compaction should be carried out with needle vibrators

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D

Chemical admixtures must be used

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Solution

The correct option is C Compaction should be carried out with needle vibrators
Abram law stated that compressive strength of hardened (fully compacted ) concrete is inversely proportional to the water - cement ratio, provided that the mix is of workable consistency.

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Similar questions

Q. Choose the correct statement.
a) The strength of fully compacted concrete is inversely proportional to the water cement ratio.
b) The strength of fully compacted concrete is directly proportional to the water cement ratio.

Q. Consider the following statements:
1. The compressive strength of concrete decreases with increase in water-cement ratio of the concrete mix.
2. Water is added to the concrete mix for hydration of cement and workability.
3. Creep and shrinkage of concrete are independent of the concrete mix.
Which of these statements are correct?

Q. Consider the following statements:
1. If more water is added to concrete for increasing its workability, it results in concrete of low strength.
2. No slump is an indication of good, workable concrete.
3. Higher the slump of concrete, lower will be its workability
4. Workability of concrete is affected by water content as well as water-cement ratio.
Which of the above statements are correct?

Q. Consider the following statements:
Curing of concrete is necessary because
1. Concrete needs more water for chemical reaction .
2. It is necessary to protect the water initially mixed in concrete from being lost during evaporation .
3. penetration of surrounding water increases the strength of concrete .
Which of these statements is/are corrcet?

Q. The minimum cement content

(\frac{k g}{m^{3}})

for a pre-specified strength of concrete (using standard notations) premised on 'free water-cement ratio' will be as

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