Question

While considering the design of R.C. buildings for providing ductility, the minimum grade of concrete limited by the Indian Code is _________

(a) M 10

(b) M 20

(c) M 35

(d) M 50

I have been asked this question by my college professor while I was bunking the class.

Question is taken from Earthquake Resistant R.C. Buildings in chapter Earthquake Resistant Buildings of Construction & Building Materials

Answer 1

Right choice is (b) M 20

Easiest explanation: While considering the design of R.C. buildings for providing ductility, the minimum grade of concrete limited by the Indian Code is M 20. The higher grade of concrete leads to a lower ultimate compressive strain which results in a reduction in ductility.