Question

Which of the following is not true about hydraulic lime?

(a) Hydraulic lime consists of clay and some amount of ferrous oxide

(b) Hydraulic lime can set under water

(c) It has a perfectly white colour

(d) It is also known as water lime

This question was addressed to me during an interview for a job.

The doubt is from Lime in section Glass, Lime, Clay Products & Bricks of Construction & Building Materials

Answer 1

Right option is (c) It has a perfectly white colour

Easiest explanation: Hydraulic lime consists of clay and some amount of ferrous oxide. It can set under water and is also known as water lime. It does not have a perfect white colour due to which it appears less sanitary than white lime or fat lime.