Influence of Palm Oil Fuel Ash on Mechanical Properties of Ultra-High-Performance Concrete

The cost of producing concrete has increased, and its effects on the natural environment have become apparent. The ideal solution is to use agro-waste material instead of cement in concrete. Palm oil fuel ash (POFA) is a by-product of the burning of waste material at the palm oil power plant. Looking at the utilization of POFA in concrete research, there has been study conducted on the behaviour of properties of normal strength concrete containing POFA in terms of compressive strength performance. However, the performance of ultra-high strength concrete produced using POFA is still lack. This research aims to determine how well POFA works as a cement substitute in ultra-high-performance concrete (UHPC). It also to determine the mechanical properties of ultra -high-performance concrete (UHPC) with POFA addition. In this study, the percentage of POFA used as a cement replacement was 5%, 10% and 15% by binder weight. The results were collected from slump test and compressive strength test. Tabulation and graph illustration were the methods used to present the data. The workability test conducted showed that with the increase of POFA addition to the UHPC, the workability of fresh concrete was reduced. Meanwhile, the compressive strength at 28 days, UHPC with 5% of POFA addition showed the maximum value of compressive strength at 84.12 N/mm2.