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:-
Explain Kelly Ball to measure the workability of concrete. Mention the limitation of the test.
What are flaky and elongated aggregates? How can the shape of aggregate influence strength of concrete? Following is the result of a sieve analysis of 500 gm aggregate:
| IS sieve size | 10 mm | 4.75 mm | 2·36 mm | 1·18 mm | 600 micron | 300 micron | 150 micron | lower than 150 micron |
| Weight retained in gm | 0 | 10 | 50 | 50 | 95 | 175 | 85 | 35 |
Find out the 'Fineness Modulus' of the sample
What are the safety considerations for designing a spillway?
What is flange beam?
Explain the role of a head regulator in diversion head works.
What is strriup ?What is the function of strriup?
