Which of the following statements is INCORRECT?

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SSC JE Civil 10 Oct 2023 Shift 3 Official Paper-I
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  1. Graphically, the relation between the strength of concrete and the water-cement ratio is approximately cubic. 
  2. The lower the water-cement ratio is, the higher will be the strength of concrete. 
  3. Lower water-cement ratio is required when the concrete mix is mechanically compacted to achieve higher strength as compared to the hand-compacted concrete mix with higher water-cement ratio.
  4. Lower water-cement ratio leads to lower workability. 

Answer (Detailed Solution Below)

Option 1 : Graphically, the relation between the strength of concrete and the water-cement ratio is approximately cubic. 
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Detailed Solution

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Explanation:

Abram's law gives the relationship between the strength of concrete and the water-cement ratio.

As per this law,

The strength of hardened concrete is inversely proportional to the water-cement ratio, only provided that the mix is workable.

Compressive strength of concrete = \(A\over B^\frac{w}{c}\) 

where A and B are constants.

RRB JE CE R 25 15Q Concrete Technology Subject Test Part 1 Nitesh D1

Additional InformationWater Cement ratio (W/C):

  • It is the ratio of water's weight to cement's weight in a concrete mix. This ratio decides the strength and workability of concrete.
  • The lower the water-cement ratio is, the higher the strength of concrete. 
  • A lower water-cement ratio is required when the concrete mix is mechanically compacted to achieve higher strength than the hand-compacted concrete mix with a higher water-cement ratio.
  • A lower water-cement ratio leads to lower workability. 
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