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Building Materials - Engineering

Q1:

Initial setting time of cement for asbestos cement products should be not less than

A 30 minutes

B 50 minutes

C 75 minutes

D 90 minutes.

ANS:D - 90 minutes.

OPC:(Ordinary Portland cement)
Initial setting time = 30 min.
Final setting time = 10 hours.

LPC:(Lime pozzolana cement)
Initial setting time= 120 min (2 hours).
Final setting time = 6 hours.

High alumina cement:
Initial setting time= 3.5 hours.
Final setting time= 5 hours.