Self healing concrete crack by using pulverized fuel ash (PFA) as cement replacement material

摘要

Nowadays the high demand of cement is an indication of development especiallyudfor the construction industry. Therefore, it is needed an alternative way in fulfill thisudsituation. Many researches were developed in order to find suitable material to be usedudas a replacement for cement such as palm oil fuel ash and pulverized fuel ash.udPulverized fuel ash can be used as a partial replacement material in cement compositionudand this material has pozzolana effect that can generate the self healing process. Selfudhealing is an autogenous healing of cracks in concrete is showed by the formation ofudcalcite in the crack. In this study, by product of coal combustion power plant fromudTanjung Bin, Johore namely pulverized fuel ash (PFA), was used as the partialudreplacement in cement in order to study the effectiveness of PFA toward self healing inudconcrete crack. The ultrasonic pulse velocity (UPV) and compressive strength test wereudconducted to determine the ability of self healing of concrete containing PFA. The resultudshows that 20 % of PFA (PFA-20) is the best percentages of cement replacement andudwater curing was the best mechanism to heal the hairline crack in concrete.