The removal of excess air after placing concrete helps.............

[Pankaj Sharma]

The removal of excess air after placing concrete helps in increasing the strength of concrete by

(a) 15 to 20 %

(b) 20 to 30 %

(c) 30 to 50 %

(d) 50 to 70 %

The correct Answer Is
(a) 15 to 20 %

 

[Nitts02]

(a) 15 to 20 %

Strength of concrete also depends on the degree of compaction as improper compaction will lead to the presence of air voids in the concrete which will certainly reduce it’s strength. It has been observed that if there is 5% void, strength of concrete decreases by as much as 30%. We can confirm the above answer with some trials to check the authenticity of the same. Certainly we will found the results falling in the above range.

 

[Ghulam Nabi]

a

 

[Mehboob]

A

 

[Chandan]

The removal of excess air after placing concrete helps in increasing the strength of concrete by

(a) 15 to 20 %

(b) 20 to 30 %

(c) 30 to 50 %

(d) 50 to 70 %

Ans-(a)