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An experimental review of the reaction paths followed by alkali-activated slag pastes
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2024-12-17 , DOI: 10.1016/j.cemconres.2024.107765
C. Paillard, N. Sanson, J.-B. d’Espinose de Lacaillerie, M. Palacios, P. Boustingorry, M. Jachiet, C. Giraudeau, V. Kocaba
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2024-12-17 , DOI: 10.1016/j.cemconres.2024.107765
C. Paillard, N. Sanson, J.-B. d’Espinose de Lacaillerie, M. Palacios, P. Boustingorry, M. Jachiet, C. Giraudeau, V. Kocaba
NMR, XRD, mechanical strength measurements, bound water quantification and isothermal calorimetry were combined to contrast the degree of reaction and the paths followed by slag under the influence of three activators: NaOH, Na2 CO3 , and Na2 Si1.7 O4.4 . NaOH-activation led to the concomitant formation of a very ordered C-A-S-H gel and of hydrotalcite, giving rise to early mechanical strength. For Na2 Si1.7 O4.4 , a N-A-S-H gel formed first due to the high quantities of silicon in solution. This led to quick setting but no mechanical strength. Later, an amorphous C-A-S-H gel provided mechanical strength, while an aluminate phase precipitated. Finally, Na2 CO3 -activation also led to the formation of N-A-S-H, formation favored by the initial consumption of calcium to form calcite. This did not bring any real structuration and mechanical strength. Only after a few days of hydration did the mechanical strength improve with the precipitation of amorphous C-A-S-H, an ill-defined hydrated aluminate phase, and of gaylussite.
中文翻译:
碱活化渣浆后反应路径的实验综述
将 NMR、XRD、机械强度测量、结合水定量和等温量热法相结合,以对比在三种活化剂(NaOH、Na2CO3 和 Na2Si1.7O4.4)影响下炉渣的反应程度和路径。NaOH 激活导致非常有序的 C-A-S-H 凝胶和水滑石的形成,从而产生早期机械强度。对于 Na2Si1.7O4.4,由于溶液中含有大量硅,首先形成 N-A-S-H 凝胶。这导致快速凝固但没有机械强度。后来,无定形的 C-A-S-H 凝胶提供了机械强度,而铝酸盐相沉淀。最后,Na2CO3 活化也导致了 N-A-S-H 的形成,最初消耗钙形成方解石有利于形成这种形成。这并没有带来任何真正的结构和机械强度。仅在水化几天后,随着无定形 C-A-S-H(一种定义不清的水合铝酸盐相)和 Gaylussite 的沉淀,机械强度才得到提高。
更新日期:2024-12-17
中文翻译:
碱活化渣浆后反应路径的实验综述
将 NMR、XRD、机械强度测量、结合水定量和等温量热法相结合,以对比在三种活化剂(NaOH、Na2CO3 和 Na2Si1.7O4.4)影响下炉渣的反应程度和路径。NaOH 激活导致非常有序的 C-A-S-H 凝胶和水滑石的形成,从而产生早期机械强度。对于 Na2Si1.7O4.4,由于溶液中含有大量硅,首先形成 N-A-S-H 凝胶。这导致快速凝固但没有机械强度。后来,无定形的 C-A-S-H 凝胶提供了机械强度,而铝酸盐相沉淀。最后,Na2CO3 活化也导致了 N-A-S-H 的形成,最初消耗钙形成方解石有利于形成这种形成。这并没有带来任何真正的结构和机械强度。仅在水化几天后,随着无定形 C-A-S-H(一种定义不清的水合铝酸盐相)和 Gaylussite 的沉淀,机械强度才得到提高。