This research aimed to investigate the effect of rice husk ash blended with fly ash on mechanical properties of concrete including compressive and flexural strengths. The studied parameter was the replacement percentages of cement by rice husk ash blended with fly ash at 0 30 and 50 by weight of cementitious materials. The constant ratio of rice husk ash to fly ash of 1:1 by weight was used in this study. The test results showed that the strength of concrete decreased while the replacement percentages of rice husk ash blended fly ash increased. The compressive strength at the age of 7 days of concrete containing rice husk ash blended with fly ash was lower than the control concrete but concrete containing rice husk ash and fly ash at 30% by weight of cementitious materials had comparable compressive and flexural strengths at the age of 28 days to the control concrete. As for the results the mechanical properties of concrete containing rice husk ash blended with fly ash at 30% by weight of cementitious materials were comparable to the control concrete.

This research presents a study of the compressive strength porosity chloride penetration resistance to carbonation and corrosion of self-compacting concrete containing fly ash ground rice husk-bark ash and ground bottom ash. Portland cement (CT) is partially replaced with pozzolans 0-40% by weight of the cementitious materials. Fly ash ground rice husk-bark ash and ground bottom ash have a high potential to be used as a good cementitious material. The results show that the compressive strength and low porosity of self-compacting concrete improves substantially with partial replacement of Portland cement with fly ash. Self-compacting concrete mix cement containing 20-40% of pozzolans can be used to make cementitious materials. The use of fly ash ground rice husk-bark ash and ground bottom ash produces concrete mix with good strength and resistance to chloride and corrosion.

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This research presents a study of the resistance to carbonation compressive strength and porosity of concrete containing ground bottom ash. Three different of bottom ash finenesses viz. coarse bottom ash (GBA-1) ground medium bottom ash (GBA-2) and ground fine bottom ash (GBA-3) were used for the study. Portland cement (CT) is partially replaced with ground bottom ash at 0-40% by weight of the bottom ash. The water to binder ratio was kept constant at 0.5. Compressive strength porosity and resistant to carbonation of concrete were investigated. Fine bottom ash has a high potential to be used as a good cementitious material. The results show that the compressive strength and low porosity of concrete improves substantially with partial replacement of Portland cement with fine bottom ash. Concrete mix cement containing 10-20% of fine bottom ash can be used to make cementitious materials. The use of finer bottom ash produces concrete mix with good strength and resistance to carbonation.