In this study, Cautre rice husk ash (RHA) was burned at various temperature from 500oC to 700oC at different retention period to survey the activity of RHA to use as an active additive for Portland blended cement (PCB). The experimental results show that RHA calcined at 500oC in 30 minutes has higher puzolanic activity and improves compressive strength of cement. The RHA sample calcined at 700oC in 30 minutes has suitable chemical properties and fineness according to TCVN 8827:2001, but it decreases the cement strength. The heat-treated RHA samples improve normal consistency and reduce the setting time of cement when comparing to non-heat treated RHA one.
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