Short notes on :
SLUMP TEST:- slump cone test is done to determine the workability of concrete or how much the concrete is fluid or plastic . This test is suitable for high workability mix.
PROCEDURE:-
Now the slump cone is raised vertically but slowly and allowed the concrete to subside. This subsidence is referred as slump of concrete.
Value- 100mm to 190mm {workable concrete}
COMPACTING FACTOR TEST:- This test is useful for concrete mix of very low workability and when concrete is to be compacted by vibration.
COMPACTING FACTOR = wt. of partially compacted concrete / wt. of fully compacted concrete
PROCEDURE:-
CRUSHING TEST:- It is a relative measure of resistance of an aggregate to crushing under gradually applied compressive load. Crushing value of aggregate is restricted to 30% as per IRC.
IMPACT TEST:- It is a measure of resistance of an aggregate to sudden impact or shock i.e. it is done to measure the toughness of an aggregate. Impact value should not normally exceed 40% as per IRC.
How standard consistency test is done on cement? Explain the procedure briefly.
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
Short notes on :
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Define flood and describe its types.
