Match the following lists :
| List-I (Types of cement) | List-II (Uses) |
|---|---|
| P.Rapid hardening | 1.Repair of bridges |
| Q.Quick-setting | 2.Dams |
| R.High alumina | 3.Concrete under water |
| S.Low-heat | 4.Refractory concrete in industries |
Select the correct answer using the code given below :
- A2 4 1 3
- B4 2 3 1
- C3 1 2 4
- D1 3 4 2Correct
Solution
Concept
Special cements and their uses
Step-by-step solution
1. Rapid hardening cement → quick repairs, e.g. bridges (1). 2. Quick-setting cement → concreting under water and in running water (3). 3. High alumina cement → refractory concrete for industrial furnaces (4). 4. Low-heat cement → mass concrete such as dams (2).
Explanation
Each special cement is selected for a property: early strength, very short setting time, heat resistance or low heat of hydration.
Why the other options are wrong
The other codes assign dams to rapid hardening or refractory use to low-heat cement, which contradicts their properties.
Shortcut
Rapid = repairs, Quick = under water, High alumina = refractory, Low heat = dams.
Common mistake
Mixing rapid-hardening with quick-setting cement.
Correct answer: D) 1 3 4 2