Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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Efficacy of functionalized sodium-montmorillonite in mitigating alkali-silica reaction
Abstract Alkali-silica reaction (ASR) is a fatal deterioration that can cause volume expansion, cracking, and premature failure of concrete. In this study, the efficacy of sodium montmorillonite (NaMt) organically functionalized with two non-ionic surfactants (ONaMts) in mitigating ASR is investigated by determining the expansion and cracking behavior of mortars containing reactive aggregates. The underlying mitigation mechanisms were analyzed through the quantification of reaction products and in-situ characterizations of ASR gels. The results revealed that, compared with raw NaMt, ASR-induced expansion and cracking can be more substantially mitigated in the presence of ONaMts, which is supported by the improved consumption of portlandite and reduced formations of both crystalline and amorphous ASR gels. The functionalized ONaMts appeared to further suppress the formation of Q3 polymerization sites, decrease the [K + Na]/Si atomic ratio and increase the Al/Ca in ASR gels.
Highlights The efficacy of functionalized sodium-montmorillonite in mitigating ASR is explored. ASR expansion and cracking are more effectively suppressed after functionalization. More effective consumption of portlandite and reduced ASR gels are obtained Smaller crystalline ASR gels and less amorphous gel with fewer Q3 sites are formed. Further decreased [K + Na]/Si ratio and increased Al/Ca ratio are found in ASR gels.
Efficacy of functionalized sodium-montmorillonite in mitigating alkali-silica reaction
Abstract Alkali-silica reaction (ASR) is a fatal deterioration that can cause volume expansion, cracking, and premature failure of concrete. In this study, the efficacy of sodium montmorillonite (NaMt) organically functionalized with two non-ionic surfactants (ONaMts) in mitigating ASR is investigated by determining the expansion and cracking behavior of mortars containing reactive aggregates. The underlying mitigation mechanisms were analyzed through the quantification of reaction products and in-situ characterizations of ASR gels. The results revealed that, compared with raw NaMt, ASR-induced expansion and cracking can be more substantially mitigated in the presence of ONaMts, which is supported by the improved consumption of portlandite and reduced formations of both crystalline and amorphous ASR gels. The functionalized ONaMts appeared to further suppress the formation of Q3 polymerization sites, decrease the [K + Na]/Si atomic ratio and increase the Al/Ca in ASR gels.
Highlights The efficacy of functionalized sodium-montmorillonite in mitigating ASR is explored. ASR expansion and cracking are more effectively suppressed after functionalization. More effective consumption of portlandite and reduced ASR gels are obtained Smaller crystalline ASR gels and less amorphous gel with fewer Q3 sites are formed. Further decreased [K + Na]/Si ratio and increased Al/Ca ratio are found in ASR gels.
Efficacy of functionalized sodium-montmorillonite in mitigating alkali-silica reaction
Luo, Dayou (Autor:in) / Wei, Jianqiang (Autor:in)
Applied Clay Science ; 245
09.09.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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