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Retarders used at grouting oil wells, where temperature is about _____________ ^oC.

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Retarders used at grouting oil wells, where temperature is about _____________ ^oC.

(a) 100

(b) 150

(c) 200

(d) 250

This question was addressed to me in an internship interview.

This interesting question is from Accelerators and Retarders topic in section Admixtures and Construction Chemicals of Concrete Technology

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Correct option is (c) 200

Easy explanation: Retarders used at grouting oil wells, where temperature is about 200 °C, at a depth of 6000 meters.

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