Question

For complete hydration of cement the w/c ratio needed is ________

(a) More than 0.25

(b) More than 0.25 but less than 0.35

(c) More than 0.35 but less than 0.60

(d) More than 0.60

I have been asked this question in an internship interview.

I need to ask this question from Process of Manufacture of Fresh Concrete topic in division Fresh Concrete of Concrete Technology

Answer 1

Right answer is (c) More than 0.35 but less than 0.60

For explanation I would say: A mix with a ratio of 0.45 may not mix thoroughly, and may not flow well enough to be placed. More water is therefore used than is technically necessary to react with cement. Water–cement ratios of 0.45 to 0.60 are more typically used.