Question

What are elastic strains?

(a) These are the instantaneous deformations that occur when an external stress is first applied

(b) These deformations occur either on loss of moisture from the concrete on cooling of concrete

(c) It is the time-dependent deformation that occurs on the prolonged application of stress

(d) Any one or combinations of the above types of deformations in a hardened concrete leads to cracking

I have been asked this question at a job interview.

This is a very interesting question from Elastic Properties of Aggregates in chapter Elasticity, Creep and Shrinkage of Concrete Technology

Answer 1

Correct answer is (a) These are the instantaneous deformations that occur when an external stress is first applied

The explanation: Elastic strain in concrete, as defined above, depends on the externally applied stress and the modulus of elasticity of concrete.