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Question
According to IS4031 (Part 5), the setting time of cement is measured at
IS4031 (Hkkx 5) ds vuqlkj] lhesaV dk lsfVax le; ekik tkrk gS
A.
Room temperature and humidity
B.
25-29°C and 90-100% Relative humidity
C.
23-27°C and 95% Relative humidity
D.
25-29°C and 60-70 Relative humidity
Answer ( Option D)

25-29°C and 60-70 Relative humidity

Solution

According to IS : 4031 (Part 5) - 1988,
    In order to find initial setting time, final setting time, soundness and strength characteristics of cement a parameter called standard consistency is used. Test for it is performed at 27 ± 2°C and relative humidity of 65±5%

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