Question

In proportion of concrete mix, 1:12 (M 25) represents

• A. Cement : fine aggregates : water
• B. Fine aggregates : cement : coarse aggregates
• C. Coarse aggregates : fine aggregates : cement
• D. Cement : fine aggregates : coarse aggregates

Hint:

The most common mix proportions for concrete are represented by the ratio Cement : Fine aggregates : Coarse aggregates.

Answer 1

The Correct Option is D

Step 1: Concrete Mix Ratio.
The concrete mix ratio defines the proportions of cement, fine aggregates, and coarse aggregates. In an M 25 mix, the ratio is usually 1:2:4 (Cement : Fine aggregates : Coarse aggregates).
Step 2: Option Analysis.
- (A) Cement : fine aggregates : water: Incorrect due to the inclusion of water. - (B) Fine aggregates : cement : coarse aggregates: Incorrect order of materials. - (C) Coarse aggregates : fine aggregates : cement: Incorrect order of materials. - (D) Cement : fine aggregates : coarse aggregates: Correct representation of the 1:2:4 mix.
Step 3: Conclusion.
The correct M 25 mix proportion is 1 part cement, 2 parts fine aggregates, and 4 parts coarse aggregates, making (D) the right answer.
Final Answer: \[ \boxed{(D) \, \text{Cement : fine aggregates : coarse aggregates.}} \]