Question

It is found that the ________ does not lead to the corrosion of reinforcement, provided that the concrete is dense and there is enough cover to the enforcement.

(a) Ground water

(b) Lake water

(c) Sea water

(d) Stream Water

The question was asked in unit test.

I need to ask this question from Properties of Cement Concrete topic in portion Cement Concrete Construction of Construction & Building Materials

Answer 1

Right option is (c) Sea water

To explain: The minimum cement content for concrete permanently under sea water should be 3 kN per metre cube and the minimum cover over there enforcement should be 75 mm. However it is not advisable to take the risk of corrosion of reinforcement for prestressed concrete and hence the sea water should not be used for the making of the prestressed concrete.