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A platform for research: civil engineering, architecture and urbanism
Strength and microstructure of alkali-activated binary blended binder containing palm oil fuel ash and ground blast-furnace slag
Highlights Good synergy was observed between ultrafine POFA and GBFS pastes at 80/20 proportion. CSH and CASH were identified to be present in the reaction product but not hydrotalcites. GBFS contributes to the soluble Ca, amorphousity and formation of CA(A)SAH products.
Abstract In this study, combinations of ultrafine palm oil fuel ash (UPOFA) and ground blast furnace slag (GBFS) have been used to study the compressive strength and microstructure of the alkali-activated GBFS–UPOFA (AAGU) binary blended binder paste. GBFS (G) was added in varying percentages to alkaline activated UPOFA (AAU) such that the ratio of G/U+G varied from 0 to 0.3 at interval of 0.05. Sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) with a final silicate modulus (Ms=SiO2/Na2O) of 1.58 were used as activators. Pozzolanic materials (G+U), activators, and free water were combined by weight ratios as: 1/0.35/0.02. A 28-day compressive strength of 44MPa was achieved for G/U+G of 0.2 cured for 24h at 60°C. Finally, characterization was done using X-ray diffraction, SEM and FTIR and the analyses revealed that GBFS contributes significantly to the mechanical strength by pore filling effects, and the formation of additional calcium (aluminate) silicate hydrate (C(A)SH).
Strength and microstructure of alkali-activated binary blended binder containing palm oil fuel ash and ground blast-furnace slag
Highlights Good synergy was observed between ultrafine POFA and GBFS pastes at 80/20 proportion. CSH and CASH were identified to be present in the reaction product but not hydrotalcites. GBFS contributes to the soluble Ca, amorphousity and formation of CA(A)SAH products.
Abstract In this study, combinations of ultrafine palm oil fuel ash (UPOFA) and ground blast furnace slag (GBFS) have been used to study the compressive strength and microstructure of the alkali-activated GBFS–UPOFA (AAGU) binary blended binder paste. GBFS (G) was added in varying percentages to alkaline activated UPOFA (AAU) such that the ratio of G/U+G varied from 0 to 0.3 at interval of 0.05. Sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) with a final silicate modulus (Ms=SiO2/Na2O) of 1.58 were used as activators. Pozzolanic materials (G+U), activators, and free water were combined by weight ratios as: 1/0.35/0.02. A 28-day compressive strength of 44MPa was achieved for G/U+G of 0.2 cured for 24h at 60°C. Finally, characterization was done using X-ray diffraction, SEM and FTIR and the analyses revealed that GBFS contributes significantly to the mechanical strength by pore filling effects, and the formation of additional calcium (aluminate) silicate hydrate (C(A)SH).
Strength and microstructure of alkali-activated binary blended binder containing palm oil fuel ash and ground blast-furnace slag
Yusuf, Moruf Olalekan (author) / Megat Johari, Megat Azmi (author) / Ahmad, Zainal Arifin (author) / Maslehuddin, Mohammed (author)
Construction and Building Materials ; 52 ; 504-510
2013-11-02
7 pages
Article (Journal)
Electronic Resource
English
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