Which of the below given formulas is used to calculate hardness coefficient?
(a) (Final hardness / initial hardness) × 100%
(b) 20 – (loss in weight / 2)
(c) 20 – (loss in weight / 3)
(d) ((20 – loss in weight) / 3) × 100%
This question was posed to me in an online interview.
Enquiry is from Tests on Stones topic in portion Materials for Construction of Basic Civil Engineering