POFA-engineered alkali-activated cementitious composite performance in acid environment

Babatunde Abiodun Salami; Megat Azmi Megat Johari; Zainal Arifin Ahmad; Mohammed Maslehuddin

doi:10.3151/jact.15.684

POFA-engineered alkali-activated cementitious composite performance in acid environment

Babatunde Abiodun Salami^*, Megat Azmi Megat Johari, Zainal Arifin Ahmad, Mohammed Maslehuddin

^*Corresponding author for this work

Applied Research Center for Metrology, Standards and Testing

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

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 (Na₂SiO₃_(aq)/NaOH_(aq)) ratios of 2.5, different molarities (10, 12 and 14 M) of NaOH_(aq) and 2% volume fraction of polyvinyl alcohol (PVA) fibres. Specimens were exposed to 10% H₂SO₄_(aq), 10% HNO₃_(aq) and 10% HCl_(aq) 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 H₂SO₄_(aq), while exposure to HNO₃_(aq) and HCl_(aq) 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 H₂SO₄_(aq) is the contribution received through the formation of gypsum, which hinders the infiltration of more acids into the matrix microstructure.

Original language	English
Pages (from-to)	684-699
Number of pages	16
Journal	Journal of Advanced Concrete Technology
Volume	15
Issue number	11
DOIs	https://doi.org/10.3151/jact.15.684
State	Published - Nov 2017

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Publisher Copyright:
© 2017 Japan Concrete Institute.

ASJC Scopus subject areas

Building and Construction
General Materials Science

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title = "POFA-engineered alkali-activated cementitious composite performance in acid environment",

abstract = "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 (Na2SiO3(aq)/NaOH(aq)) ratios of 2.5, different molarities (10, 12 and 14 M) of NaOH(aq) and 2\% volume fraction of polyvinyl alcohol (PVA) fibres. Specimens were exposed to 10\% H2SO4(aq), 10\% HNO3(aq) and 10\% HCl(aq) 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 H2SO4(aq), while exposure to HNO3(aq) and HCl(aq) 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 H2SO4(aq) is the contribution received through the formation of gypsum, which hinders the infiltration of more acids into the matrix microstructure.",

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AU - Salami, Babatunde Abiodun

AU - Johari, Megat Azmi Megat

AU - Ahmad, Zainal Arifin

AU - Maslehuddin, Mohammed

PY - 2017/11

Y1 - 2017/11

N2 - 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 (Na2SiO3(aq)/NaOH(aq)) ratios of 2.5, different molarities (10, 12 and 14 M) of NaOH(aq) and 2% volume fraction of polyvinyl alcohol (PVA) fibres. Specimens were exposed to 10% H2SO4(aq), 10% HNO3(aq) and 10% HCl(aq) 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 H2SO4(aq), while exposure to HNO3(aq) and HCl(aq) 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 H2SO4(aq) is the contribution received through the formation of gypsum, which hinders the infiltration of more acids into the matrix microstructure.

AB - 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 (Na2SiO3(aq)/NaOH(aq)) ratios of 2.5, different molarities (10, 12 and 14 M) of NaOH(aq) and 2% volume fraction of polyvinyl alcohol (PVA) fibres. Specimens were exposed to 10% H2SO4(aq), 10% HNO3(aq) and 10% HCl(aq) 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 H2SO4(aq), while exposure to HNO3(aq) and HCl(aq) 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 H2SO4(aq) is the contribution received through the formation of gypsum, which hinders the infiltration of more acids into the matrix microstructure.

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ER -

POFA-engineered alkali-activated cementitious composite performance in acid environment

Abstract

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