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Evaluation of Pozzolanic Activity of Rice Husk Ash

The changes in physical and chemical properties of RHA (rice husk ash) fired at several temperatures from 400 deg C to 800 deg C at 50 deg C increments were studied. The effect of RHA on properties of mortar such as strength, drying shrinkages, resistance to acid attack, freeze thaw resistance and carbonation was also determined. It was found that the compressive strength of RHA blended mortar with respect to that of plain mortar corresponded to the variation in conductivity. The RHA in mortar improved resistance to acid attack and developed the same degree of resistance to freeze-thaw action as that with the use of silica fume, while it increased the drying shrinkage.