Question

Consider the following statements :
1. Workability of concrete increases with the increase in the proportion of water content
2. Concrete having small-sized aggregates is more workable than that containing large-sized aggregate
3. For the same quantity of water, rounded aggregates produce a more workable concrete mix as compared to angular and flaky aggregates
4. A concrete mix with no slump shown in the slump cone test indicates its very poor workability
Which of the above statements are correct ?

• A. 1, 2 and 3 only
• B. 1, 2 and 4 only
• C. 1, 3 and 4 only
• D. 2, 3 and 4 only

Answer 1

The correct option is C 1, 3 and 4 only

Workability of concrete is the ease with which concrete mixes can be mixed transported, placed in formwork and compacted as completely as possible. While using the lowest possible water/cement ratio.
Workability of concrete should be obtained by the use of a well-graded aggregate which has the largest maximum particle size possible.
The use of smooth and rounded, rather than irregular shape aggregate, also increase workability.
Adding water increases workability and decreases strength.
Slump value of zero is an indication of extremely low workability of the mixture.