Question

Which of the following concrete mix cement: sand: coarse aggregates is not used in reinforced concrete pipes?

• A. 1:1.5:2
• B. 1:2:2
• C. 1:2:3
• D. 1:2.5:2

Hint:

RCC pipes require rich mixes (higher cement content).
Common mixes: 1:1.5:2, 1:2:2, 1:2.5:2.
Leaner mixes like 1:2:3 are not suitable.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Reinforced concrete pipes (RCC pipes) require specific concrete mixes for structural integrity and durability.

Step 2: Detailed Explanation:
For reinforced concrete pipes, richer concrete mixes are used to ensure strength, impermeability, and durability.
Common mixes used for RCC pipes:
- 1:1.5:2 (A): Rich mix, used for high strength.
- 1:2:2 (B): Rich mix, used for standard pipes.
- 1:2.5:2 (D): Used for some applications.
1:2:3 (C): This is a leaner mix, more commonly used for general structural concrete.
It does not provide adequate strength and impermeability for RCC pipes.
Thus, 1:2:3 is not used for reinforced concrete pipes.

Step 3: Final Answer:
Thus, the concrete mix not used in reinforced concrete pipes is 1:2:3.
[0.5cm]