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Q: In order to overcome the accelerating effect of initial setting time concrete at high temperature, which type of admixtures are added to the fresh mix?
  • A. Air- entraining
  • B. Retarders
  • C. Accelerators
  • D. Superplsticizers
Correct Answer: Option B - Retarders– • Retarders are chemical that delay the initial setting time of concrete. • Their is often used in hot weather to counter the rapid setting due to high temperature. • Therefore, retarders often used in the construction of oil well at which temperature increase up to 200°.
B. Retarders– • Retarders are chemical that delay the initial setting time of concrete. • Their is often used in hot weather to counter the rapid setting due to high temperature. • Therefore, retarders often used in the construction of oil well at which temperature increase up to 200°.

Explanations:

Retarders– • Retarders are chemical that delay the initial setting time of concrete. • Their is often used in hot weather to counter the rapid setting due to high temperature. • Therefore, retarders often used in the construction of oil well at which temperature increase up to 200°.