Rapid Hardening Portland Cement (IS: 8041)
Rapid Hardening Portland Cement (IS: 8041) has high
lime content and can be obtained by increasing the C3S
content but is normally obtained from OPC clinker by finer grinding (450 m2/kg).
The basis of application of rapid hardening cement (RHC) is hardening
properties and heat emission rather than setting rate. This permits addition of
a little more gypsum during manufacture to control the rate of setting. RHC
attains same strength in one day which an ordinary cement may attain in 3 days.
However, it is subjected to large shrinkage and water requirement for
workability is more. The cost of rapid hardening cement is about 10 per cent
more than the ordinary cement. Concrete made with RHC can be safely exposed to
frost, since it matures more quickly.
Properties:
Initial setting time 30 minutes (minimum)
Final
setting time l0 hours (maximum)
Compressive
strength
1
day 16.0 N/mm2
3
day 27.5 N/mm2
Uses: It is suitable for repair of roads and bridges and when load is applied in a short period of time.
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