Question

Which of the following statement is incorrect for mixing water?

(a) Suspended particles of clay and slit < .02%

(b) The quality of CaCl2 is restricted to 1.5%

(c) The pH value of water should be between 6-8

(d) Free vegetable oil is beneficial

This question was addressed to me in a national level competition.

Question is taken from Quality of Water in section Water of Concrete Technology

Answer 1

Right option is (d) Free vegetable oil is beneficial

To explain: Free vegetable oil is harmful but mineral oil up to 2% is beneficial to concrete for making healthy structure.