Question

With regard to the curing water, identify the incorrect statement.

(a) Curing water shouldn’t produce objectionable stains on the surface

(b) The presence of tannic acid and iron compounds is objectionable

(c) Iron and organic matter are responsible for staining

(d) Water is suitable for mixing is also suitable for curing

The question was posed to me in an interview for internship.

My enquiry is from Quality of Water topic in chapter Water of Concrete Technology

Answer 1

Right choice is (c) Iron and organic matter are responsible for staining

To elaborate: With regard to the curing water, Iron and organic matter are responsible for staining.