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Building Materials - Engineering

Q1:

Pick up the correct statement from the following:

A For thin structures subjected to wetting and drying, the water cement ratio should be 0.45

B For mass concrete structures subjected to wetting and drying, the water ratio should be 0.55

C For thin structures which remain continuously under water, the water-cement ratio by weight should be 0.55

D For massive concrete structures which remain continuously under water, the water cement ratio by weight should be 0.65

E All the above.

ANS:E - All the above.

As we see in the IS Code-10262, it,s clear that the W/C ratio is fixed based on the experience (d/mix done earlier if any for that area) and trail mix for the particular Gr of concrete. It also depends on the workability (i.e, the reqd. Slump).

W/C ratio normally increases for the higher Gr. of Concrete. The Selection of Gr.of concrete basically depends on the factor like- (a) Types of structure (b) Location of structure (i.e, exposure condition) )to be constructed (c) Strength required for the Concrete.

So, confirming the W/C ratio without considering the above factors is not practically acceptable.