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: Understanding the Concrete Mix Proportion.
The mix ratio of concrete represents the proportion of cement, fine aggregates, and coarse aggregates used to create a concrete mixture. In M 25 mix, the ratio of materials is typically 1:2:4 (Cement : Fine aggregates : Coarse aggregates).
Step 2: Analysis of the Options.
- (A) Cement : fine aggregates : water: This option includes water, but it is not the correct proportion.
- (B) Fine aggregates : cement : coarse aggregates: This option incorrectly places fine aggregates first.
- (C) Coarse aggregates : fine aggregates : cement: The proportion places coarse aggregates first, which is incorrect.
- (D) Cement : fine aggregates : coarse aggregates: This option correctly represents the typical proportion of a 1:2:4 concrete mix.

Step 3: Conclusion.
The correct proportion of the M 25 mix is 1 part cement, 2 parts fine aggregates, and 4 parts coarse aggregates, making (D) the correct answer.

Final Answer: \[ \boxed{(D) \, \text{Cement : fine aggregates : coarse aggregates.}} \]