How do water-cement ratio and workability affect the strength of concrete? What are the factors promoting shrinkage?
w/c ratio is directly proportional to workability and inversely proportional to strength.
If w/c ratio is increased workability increased, which increase the ease and homogeneity with which it can be handled and mixed.
But as w/c ratio is increased the strength of concrete becomes poor.
Because proper proportion of water if not maintained in concrete mix, excess water accumulates in the mix and reduces the strength.
Factors affecting shrinkage:-
What is an air entraining agents? Give some examples. What is efflorescence in concrete structure?
What are the initial and final setting times of cement ? How are they experimentally determined ?
How standard consistency test is done on cement? Explain the procedure briefly.
