A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Mitigating alkali-silica reaction through metakaolin-based internal conditioning: New insights into property evolution and mitigation mechanism
Abstract This study investigates the role of metakaolin-based internal conditioning (MIC) in mitigating alkali-silica reaction (ASR) by monitoring volume expansion, cracking, permeability, strength, and microstructure of mortar containing reactive aggregates. Comprehensive insights into the mitigation mechanisms were obtained by elucidating the silica dissolution of aggregate and property evaluations of ASR gels with varying compositions. Substantial decreases in ASR expansion and cracking density up to 80.2 % and 73.5 %, respectively, revealed the robust role of MIC in ASR suppression outperforming single uses of metakaolin or lithium. A synergistic effect in suppressing multiple prerequisites of ASR was observed from the co-existing MIC and lithium, which was explained by the complementary efficiency between lithium and aluminum in suppressing silica dissolution, 55.7 % lower water uptake and 87.3 % less swelling potential of ASR gel, as well as the conversion of expansive ASR (Q3) gel into non-expansive C-S-H (Q2) phase making it a promising approach in designing durable concrete.
Highlights A novel metakaolin-based internal conditioning (MIC) for mitigating ASR is explored. MIC shows higher ASR mitigation efficiency than dry metakaolin or lithium admixture. MIC and Li exhibit synergistic roles in suppressing ASR expansion and cracking. New sights into ASR mitigation mechanism are obtained based on multi-scale analysis. Li and Al synergize to modify silica dissolution, and phases/properties of ASR gels.
Mitigating alkali-silica reaction through metakaolin-based internal conditioning: New insights into property evolution and mitigation mechanism
Abstract This study investigates the role of metakaolin-based internal conditioning (MIC) in mitigating alkali-silica reaction (ASR) by monitoring volume expansion, cracking, permeability, strength, and microstructure of mortar containing reactive aggregates. Comprehensive insights into the mitigation mechanisms were obtained by elucidating the silica dissolution of aggregate and property evaluations of ASR gels with varying compositions. Substantial decreases in ASR expansion and cracking density up to 80.2 % and 73.5 %, respectively, revealed the robust role of MIC in ASR suppression outperforming single uses of metakaolin or lithium. A synergistic effect in suppressing multiple prerequisites of ASR was observed from the co-existing MIC and lithium, which was explained by the complementary efficiency between lithium and aluminum in suppressing silica dissolution, 55.7 % lower water uptake and 87.3 % less swelling potential of ASR gel, as well as the conversion of expansive ASR (Q3) gel into non-expansive C-S-H (Q2) phase making it a promising approach in designing durable concrete.
Highlights A novel metakaolin-based internal conditioning (MIC) for mitigating ASR is explored. MIC shows higher ASR mitigation efficiency than dry metakaolin or lithium admixture. MIC and Li exhibit synergistic roles in suppressing ASR expansion and cracking. New sights into ASR mitigation mechanism are obtained based on multi-scale analysis. Li and Al synergize to modify silica dissolution, and phases/properties of ASR gels.
Mitigating alkali-silica reaction through metakaolin-based internal conditioning: New insights into property evolution and mitigation mechanism
Luo, Dayou (author) / Sinha, Arkabrata (author) / Adhikari, Madhab (author) / Wei, Jianqiang (author)
2022-06-19
Article (Journal)
Electronic Resource
English
Alkali–silica reaction in metakaolin-based geopolymer mortar
| Online Contents | 2015
Alkali–silica reaction in metakaolin-based geopolymer mortar
| British Library Online Contents | 2015
Alkali–silica reaction in metakaolin-based geopolymer mortar
| Online Contents | 2014
Alkali–silica reaction in metakaolin-based geopolymer mortar
| Springer Verlag | 2014