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The exposure of conventional mixing in open bowl is about ___________ ppm in the breathing zone.(a) 20(b) 40(c) 50(d) 10I had been asked this question by my college director while I was bunking the class.This is a very interesting question from Hot Weather Concreting, Prepacked and Vacuum Cement topic in portion Special Concrete and Concreting Methods of Concrete Technology |
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Answer» RIGHT choice is (d) 10 To ELABORATE: 10 ppm is the exposure value of conventional mixing in open bowl in the breathing zone. And the exposure LIMIT LIES in the range of 50-100 ppm in Europe. |
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