| Summary: | High Strength Concrete (HSC) mixes were produced using Rice Husk Ash (RHA) as a
partial cement replacement material at replacement levels from 5%, 10%, 15% and
20%. The effects of RHA addition on workability, compressive strength and strength
development of HSC have been studied. RHA has about 95% silica content. It was
produced by burning (calcinations) rice husk at temperature of 600 °C for 4 hours. A
total of 150 test specimens were prepared and tested at the ages of 1, 3 7, 28, 56 and 84
days. In order to study the effects of RHA inclusion, Slump, Flow Table, Compressive
Strength, Permeability, Porosity and Ultrasonic Pulse Velocity tests have been
performed. Test results indicate that the inclusion of RHA tends to reduce the flow,
although the slump values were not affected. Early age compressive strength was
reduced, but long term strength was increased. The concrete containing 10% RHA
exhibited the highest 84 days strength. In addition, the porosity and permeability of
concrete containing RHA is lower than the control from the age of 3 to 84 days. The
effect of RHA seems to increase the UPV of concrete compared to the control.
Therefore, the RHA produced could be potentially used as a mineral admixture, to
improve the properties and performance of concrete.
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