Utilisation of palm oil fuel ash (POFA) as cement replacement by using powder and liquidation technique

摘要

Utilisation of waste material as additives in concrete has growing and interest to the world of construction. Due to massive use of natural sources such as limestone, the availability of those raw sources is in extinction. This paper presents the experimental investigations conducted on concrete grade 30 incorporating agro-industrial waste, POFA as supplementary cementitious material to evaluate on its properties. POFA being utilized as pozzolons in partially replacing cement due to its siliceous composition that will increase in concrete strength. A total of 45 concrete cubes (100 mm × 100 mm × 100 mm) and 45 concrete cylindrical of 100 mm × 200 mm were produced at various percentage OPC replacement with POFA of 5% and 10% with different powder and liquidation technique. The workability of fresh concrete properties was tested by the slump test and the performances of the hardened concrete were tested by compression and splitting tensile. Based on the result, POFA replacement using liquidation technique showed more workability compared to POFA replacement. However, concrete with 5% POFA using powder technique gives better result on the concrete performancein hardened properties.