1.

If t1=Time at which water is first added to cement, t2=Time when needle fails to penetrate 5 mm to 7 mm from bottom of the mould, t3=Time when the needle makes an impression but the attachment fails to do so, then what is final setting time?(a) t2-t1(b) t2+t1(c) t3-t1(d) 2*t1I had been asked this question during an interview for a job.The question is from Setting Time Test in chapter Types of Cement and Testing of Cement of Concrete Technology

Answer»

The correct CHOICE is (c) t3-t1

Explanation: t3-t1 is the FORMULA to determine the value of the FINAL setting time of CONCRETE for further PROCESS.



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