Correct option is B
Answer (b)
Segregation in concrete occurs when the coarse aggregate separates from the mortar due to improper handling or excessive free fall during placement. One of the main causes of segregation is dropping concrete from excessive height, which leads to separation of ingredients and non-uniform concrete.
To avoid segregation and ensure uniform distribution of materials, concrete should not be allowed to fall freely from a height greater than the permissible limit during placing.
As per standard construction practice, concrete should not be thrown from a height more than 1.5 m.
Correct Option:
B) 1.5 m
