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Ahmad, Zainal Ariffin
in Cooperation with on an Cooperation-Score of 37%
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Publications (2/2 displayed)
- 2016Impact of added water and superplasticizer on early compressive strength of selected mixtures of palm oil fuel ash-based engineered geopolymer compositescitations
- 2016Durability performance of Palm Oil Fuel Ash-based Engineered Alkaline-activated Cementitious Composite (POFA-EACC) mortar in sulfate environmentcitations
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article
Durability performance of Palm Oil Fuel Ash-based Engineered Alkaline-activated Cementitious Composite (POFA-EACC) mortar in sulfate environment
Abstract
<p>This paper presents an investigation into the durability performance of Palm Oil Fuel Ash-based Engineered Alkaline-activated Cementitious Composite (POFA-EACC) mortar exposed to sulfate environment. Cube specimens measuring 50 mm × 50 mm × 50 mm were prepared from POFA-EACC and exposed to the sulfate solutions after one day of heat curing. The POFA-EACC mixtures were prepared with 100% POFA, 2% volume fraction of polyvinyl alcohol (PVA) fibres, alkali-activator (Na<sub>2</sub>SiO<sub>3(aq)</sub>/NaOH<sub>(aq)</sub>) ratios of 2.5 and different molarities (10, 12 and 14 M) of NaOH<sub>(aq)</sub>. Three salt solutions (5% Na<sub>2</sub>SO<sub>4(aq)</sub>, 5% MgSO<sub>4(aq)</sub> and 2.5% Na<sub>2</sub>SO<sub>4(aq)</sub> + 2.5% MgSO<sub>4(aq)</sub>) were used to study the resistance of the POFA-EACC mortar specimens to sulfate for 9 months. Parameter used for the study are changes in weight, compressive strength and visual changes. SEM and XRD were employed to characterize and study changes in the microstructure of the exposed specimens. The results obtained from this study revealed that the specimens exposed to 5% MgSO<sub>4(aq)</sub> solution have better durability performance than the specimens exposed to 5% Na<sub>2</sub>SO<sub>4(aq)</sub>.</p>