INFLUENCE OF PALM OIL FUEL ASH ON PROPERTIES OF HIGH-STRENGTH GREEN CONCRETE

(Abdullah. M. Zeyad, M. A. Megat Johari, Bassam A. Tayeh ‎, Ibrahim M. Alshaikh )

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Abstract

Palm oil ‎ ash wastes are normally used as fuel to heat up boiler for electricity ‎generation in palm oil ‎mills. This process leads to the production of unwanted ash residue ‎which is known as palm oil ‎fuel ash (POFA). The sufficiently amorphous POFA contains ‎a high amount of silica, which makes ‎it possible to be used as a pozzolanic material in ‎concrete‎. POFA was treated to lower the unburned carbon and to reduce the particle ‎size ‎and then used in the production of high strength concrete by partially substituting ‎ordinary ‎Portland cement (OPC) at replacement levels of 0%, 10%, 20%, 30%, 40%, 50 and 60% ‎on the mass-for-mass ‎basis. The results show that the high strength green concrete ‎containing POFA has superior ‎workability, strength and transport properties when ‎compared with the control OPC high ‎strength concrete even at high POFA content of ‎‎60%. Hence, the treated POFA has promising ‎potential to be utilized in the production of ‎high strength green concrete with superior strength ‎and transport properties. This could ‎directly contribute to sustainability of the concrete industry, ‎via the utilization of agro-‎industry by-product in high strength green concrete with lower cement ‎consumption and ‎potentially superior durability performance.‎ Key Words: high- strength green concrete; palm ash; strength; transport properties; workability
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