Question

The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be _________

(a) Between 150 to 300 kg/cm^2

(b) Between 350 to 600 kg/cm^2

(c) Between 150 to 400 kg/cm^2

(d) Less than 200 kg/cm^2

This question was posed to me during an interview.

This intriguing question originated from Strength of Aggregates topic in portion Aggregates and Testing of Aggregates of Concrete Technology

Answer 1

The correct option is (d) Less than 200 kg/cm^2

Easiest explanation: The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be less than 200 kg/cm^2.