Question

Select the incorrect statement

• A. Lean mixes bleed more as compared to rich ones
• B. Bleeding can be minimized by adding pozzolana finer aggregate
• C. Bleeding can be increased by addition of calcium chloride
• D. None of the above

Hint:

Bleeding can be controlled by reducing water content and increasing fines in the concrete mix.

Answer 1

The Correct Option is D

Step 1: Understand bleeding in concrete.
Bleeding is the phenomenon where excess water rises to the surface of freshly placed concrete.
Step 2: Examine each statement.
(A) Lean mixes have less cement and more water, hence bleeding is more — correct.
(B) Addition of pozzolanic or finer materials reduces bleeding by filling voids — correct.
(C) Calcium chloride accelerates setting and can increase bleeding — correct.
Step 3: Identify the incorrect statement.
Since all the given statements (A), (B), and (C) are correct, none of them is incorrect.
Step 4: Conclusion.
Hence, the correct answer is (D) None of the above.