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Ahmad, Zainal Arifin
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Publications (5/5 displayed)
- 2021Effect of alkaline activator ratio on the compressive strength response of POFA-EACC mortar subjected to elevated temperaturecitations
- 2017POFA-engineered alkali-activated cementitious composite performance in acid environmentcitations
- 2016The Hardness Properties of Porcelain with Substitution of Quartz by Rice Husk Ash at Different Soaking Timecitations
- 2015In-process detection of chipping in ceramic cutting tools during turning of difficult-to-cut material using vision-based approachcitations
- 2007CORRELATION BETWEEN THE BENDING STRENGTH AND THE THICKNESS INTERLAYER OF ALUMINA-MILD STEEL FRICTION WELDED AT LOWER ROTATIONAL SPEED
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article
Effect of alkaline activator ratio on the compressive strength response of POFA-EACC mortar subjected to elevated temperature
Abstract
<p>The paper reports the outcome of the research work on mechanical and microstructural changes to palm oil fuel ash engineered alkali-activated cementitious composite (POFA-EACC) mortar exposed to different levels elevated temperatures (300–900°C) for 2 h. POFA-EACC mortar utilised in the study was prepared from POFA activated with liquid sodium silicate and sodium hydroxide and reinforcement was provided by 2% volume fraction of polyvinyl alcohol fibres. The changes in the POFA-EACC mortar microstructure were investigated by means of SEM/EDS, XRD and FTIR. After exposure, the compressive strength of mortar specimens exposed to 300°C and 900°C temperatures for all alkali-activated ratios reduced while specimens exposed to 600°C temperature recorded improved strength for all AA ratios. The increase in strength of the specimens exposed to 600°C is due to the microstructural strengthening aided by post-heating solidification of the molten phase of the POFA-EACC mortar. The highly manifested changes in the phase composition were revealed in the POFA-EACC morphology and residual compressive strength after exposure.</p>