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Vacuum mixing systems reduce the exposure by _________ %.

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in Concrete Technology by (122k points)
Vacuum mixing systems reduce the exposure by _________ %.

(a) 20

(b) 40

(c) 50

(d) 10

This question was posed to me in unit test.

I'd like to ask this question from Hot Weather Concreting, Prepacked and Vacuum Cement topic in division Special Concrete and Concreting Methods of Concrete Technology

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Best answer
Correct choice is (c) 50

Easy explanation: Vacuum mixing system decreases the exposure by 50 % to 70% and eliminates the contact with the bone cement while delivery.

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