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Question

Which of the following methods will help in reducing segregation in concrete?
1. Not using vibrator to spread the concrete
2. Reducing the continued vibration
3. Improving the cohesion of a lean dry mix through addition of a further small quantity of water.

A
1, 2 and 3
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B
1 and 2 only
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C
1 and 3 only
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D
2 and 3 only
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Solution

The correct option is A 1, 2 and 3
Segregation can be reduced by preventing over-vibration, using good design mixes, avoiding dropping concrete from heights, avoiding excess water etc.
Continuous vibration increases the chances of segregation and in lean dry mix; small quantities of water can improve the cohesion among the ingredients because of which segregation chance reduces.

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