Discussion
An accelerating admixture is used chiefly to
Answer: A
Correct answer: speed early strength gain in cold weather
An accelerator brings forward setting and early strength, which is what cold weather working needs: formwork struck sooner, and the concrete carried past the point where frost could damage it. Extending the placing time is a retarder, reducing the water is a plasticiser, and entraining bubbles is an air-entraining agent - four different admixtures for four different problems.
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