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This study aims to evaluate the influence of palm oil Empty Fruit Bunch (EFB) fibers on flexural strength performance of concrete in the presence of Palm Oil Biomass Clinker (POBC). This study considered various proportions of palm oil EFB fibers as 0%, 0.2%, 0.4%, and 0.6% in concrete with fixed amount of POBC as 10%. I t was investigated that there is substantial influence of palm oil EFB fibers on properties of concrete containing 10% POBC as sand replacement. The experimental findings of this study indicated that the workability of fresh mix concrete decreases as palm oil EFB fiber content increased. Besides that, hardened properties of concrete were found to be improved as the amount of palm oil EFB fibers increased in the concrete. It was noticed that flexural strength was improved with addition of 0.2% palm oil EFB fibers that act as reinforcement and deliver growth in flexural strength for concrete containing 10% of POBC. Hence, it was concluded that palm oil EFB fiber could be utilized as fiber reinforcement in concrete to improve flexural strength performance of the concrete. ABSTRAK: Kajian ini bertujuan mengkaji pengaruh gentian tandan kelapa sawit (EFB) terhadap kekuatan lentur pada konkrit dengan kehadiran klinker minyak kelapa sawit biomas (POBC). Kajian ini mengguna pakai pelbagai peratus serat EFB kelapa sawit dalam konkrit iaitu sebanyak 0%, 0.2%, 0.4%, dan 0.6% dengan jumlah tetap POBC sebanyak 10%. Didapati bahawa gentian tandan kelapa sawit EFB yang mengandungi 10% POBC berpengaruh besar sebagai pengganti pasir dalam bahan konkrit. Penemuan eksperimen menunjukkan bahawa kebolehkerjaan campuran baru konkrit berkurangan apabila kandungan gentian EFB minyak sawit meningkat. Selain itu, sifat-sifat mengeras pada konkrit didapati bertambah baik apabila jumlah gentian EFB minyak sawit meningkat dalam konkrit. Di samping itu, kekuatan lenturan meningkat dengan penambahan sebanyak 0.2% serat EFB minyak kelapa sawit, berfungsi sebagai penguat dan penambah kekuatan lenturan pada konkrit yang mengandung 10% POBC. Oleh itu, serat EFB minyak kelapa sawit boleh digunakan sebagai penguat gentian dalam konkrit bagi meningkatkan kekuatan lenturan konkrit.

INFLUENCE OF PALM OIL BIOMASS CLINKER AND EMPTY FRUIT BUNCH FIBERS ON CONCRETE PROPERTIES