Question

Consider the following statements:
1. If more water is added to concrete for increasing its workability, it results in concrete of low strength.
2. No slump is an indication of good, workable concrete.
3. Higher the slump of concrete, lower will be its workability
4. Workability of concrete is affected by water content as well as water-cement ratio.
Which of the above statements are correct?

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

Answer 1

The correct option is C 1 and 4 only

Workability of concrete is the property of freshly mixed concrete which determines the ease and homogeneity with which it can be mixed, placed, consolidated and finished. As defined by ACI standard 116R-90 (ACI 1990 b).
If the water-cement ratio is increased, workability and compaction problems will be solved but there may occur some other problems like bleeding and losing compressive strength.
Higher the slump of concrete, higher will be its workability.