Question

For usual values of permissible compressive stress and specific gravity of concrete, a high concrete gravity is the one whose height exceeds ______________

(a) 48 m

(b) 70 m

(c) 88 m

(d) 98 m

The question was posed to me by my college director while I was bunking the class.

Question is taken from Gravity Method in chapter Gravity Dam Design and Construction of Irrigation Engineering

Answer 1

The correct answer is (c) 88 m

Easy explanation: The limiting height is – Hmax = f / (Sc + 1) ϒw Permissible strength of concrete = 3000 KN/m^2, Sc = specific gravity of concrete = 2.4

Hmax = 3000/[(2.4 + 1) x 9.81] = 89.9 m.