Question

The relative humidity of laboratory should be ___________ for standard consistency.

(a) 65 ± 5%

(b) 27 ± 2%

(c) 50 ± 5%

(d) 45 ± 10

I got this question in quiz.

My question is taken from Standard Consistency Test topic in division Types of Cement and Testing of Cement of Concrete Technology

Answer 1

Right choice is (a) 65 ± 5%

To explain: Unless otherwise specified this test shall be conducted at a temperature 27 + 20 C and the relative humidity of laboratory should be 65 + 5%.