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Ahmad, Zainal Arifin
in Cooperation with on an Cooperation-Score of 37%
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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
POFA-engineered alkali-activated cementitious composite performance in acid environment
Abstract
<p>The durability performance of palm oil fuel ash engineered alkali-activated cementitious composite (POFA-EACC) mortar exposed to different acid solutions is assessed in this study. 50 mm cubic specimens used for the study were prepared from 100% POFA, alkali-activator (Na<sub>2</sub>SiO<sub>3</sub><sub>(aq)</sub>/NaOH<sub>(aq)</sub>) ratios of 2.5, different molarities (10, 12 and 14 M) of NaOH<sub>(aq)</sub> and 2% volume fraction of polyvinyl alcohol (PVA) fibres. Specimens were exposed to 10% H<sub>2</sub>SO<sub>4</sub><sub>(aq)</sub>, 10% HNO<sub>3</sub><sub>(aq)</sub> and 10% HCl<sub>(aq)</sub> at pH of 0.56, 0.52 and 0.42 respectively for 3, 6 and 9 months, with unexposed specimens as control. Small changes in compressive strength were identified with POFA mortar specimens during exposure to H<sub>2</sub>SO<sub>4</sub><sub>(aq)</sub>, while exposure to HNO<sub>3</sub><sub>(aq)</sub> and HCl<sub>(aq)</sub> greatly reduced the strength of the POFA mortar specimens. The results were supported through microstructural examinations using SEM, while the characterization was done using XRD and FTIR. The high resistance of POFA-EACC mortar to H<sub>2</sub>SO<sub>4</sub><sub>(aq)</sub> is the contribution received through the formation of gypsum, which hinders the infiltration of more acids into the matrix microstructure.</p>