TY - JOUR
T1 - Effect of alkaline activator ratio on the compressive strength response of POFA-EACC mortar subjected to elevated temperature
AU - Salami, Babatunde Abiodun
AU - Maslehuddin, Mohammed
AU - Johari, Megat Azmi Megat
AU - Mohamed, Hatim Dafalla
AU - Ahmad, Zainal Arifin
N1 - Publisher Copyright:
© 2021 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2021/3/6
Y1 - 2021/3/6
N2 - 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.
AB - 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.
KW - Palm oil fuel ash (POFA)
KW - alkali-activated mortar
KW - compressive strength
KW - elevated
KW - temperature
UR - http://www.scopus.com/inward/record.url?scp=85104599535&partnerID=8YFLogxK
U2 - 10.1080/09603409.2021.1897942
DO - 10.1080/09603409.2021.1897942
M3 - Article
AN - SCOPUS:85104599535
SN - 0960-3409
VL - 38
SP - 166
EP - 176
JO - Materials at High Temperatures
JF - Materials at High Temperatures
IS - 3
ER -