Nature of aluminates in C-A-S-H: A cryogenic stability insight, an extension of DNA-code rule, and a general structural-chemical formula - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Cement and Concrete Research Année : 2023

Nature of aluminates in C-A-S-H: A cryogenic stability insight, an extension of DNA-code rule, and a general structural-chemical formula

Matthieu Vandamme
Laurent Brochard
Zhenlei Zhang
  • Fonction : Auteur
Qiang Ren
  • Fonction : Auteur
Chen Li
  • Fonction : Auteur
Bei He
  • Fonction : Auteur
Hongen Zhang
  • Fonction : Auteur
Qing Chen
  • Fonction : Auteur
Zhengwu Jiang
  • Fonction : Auteur

Résumé

Herein, we report a cryogenic attack study on C-A-S-H with bulk Ca/(Al+Si) = 0.84~1.75, Al/(Al+Si) = 0.1, 0.2. The C-A-S-H nanostructure variations are quantitively analyzed using thermogravimetric analysis, single-pulse 29Si, and 27Al MAS NMR. Observing the conversion of tetrahedral aluminates to octahedral ones in the absence of depolymerization, we confirm the presence of bridging octahedral aluminates in C-A-S-H chains. The consistency between the slight polymerization and the decrease of pentahedral aluminate fraction in low-Al C-A-S-H reveals the existence of interlayer pentahedral aluminate. The depolymerization in high-Al C-A-S-H is accompanied by conversion of pentahedral aluminate to octahedral aluminate, which confirms the presence of bridging pentahedral and interlayer octahedral aluminates. We further identify the complexes for each structural unit. Then, a DNA-code rule is proposed to describe C-A-S-H atomistic structure considering both bridging and interlayer aluminates. Finally, we propose a general structural-chemical formula for C-A-S-H.
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Dates et versions

hal-04159290 , version 1 (11-07-2023)

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Citer

Xinping Zhu, Matthieu Vandamme, Laurent Brochard, Zhenlei Zhang, Qiang Ren, et al.. Nature of aluminates in C-A-S-H: A cryogenic stability insight, an extension of DNA-code rule, and a general structural-chemical formula. Cement and Concrete Research, 2023, 167, pp.107131. ⟨10.1016/j.cemconres.2023.107131⟩. ⟨hal-04159290⟩
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