Retarding admixtures are commonly used in which of the following situations?
- ACold weather concreting
- BTo improve early strength gain
- CTo enhance workability
- DHot weather concretingCorrect
Solution
Concept
Use of retarders
Step-by-step solution
1. Retarders delay the setting of concrete. 2. They are used in hot weather and for long hauls.
Explanation
In hot weather concrete sets quickly; retarders give time for placing and finishing.
Why the other options are wrong
In cold weather accelerators are used.
Shortcut
Hot weather = retarder.
Correct answer: D) Hot weather concreting