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Article: Composition and Nano-structure of C-(A)-S-H Gels in Cement Pastes after Sulphate Attack

TitleComposition and Nano-structure of C-(A)-S-H Gels in Cement Pastes after Sulphate Attack
Authors
KeywordsCalcium silicate hydrate gels
Magnesium sulphate solution
Mortars
Silicon oxide tetrahedron
Structural change
Sulphate attack
Issue Date2021
Citation
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society, 2021, v. 49, n. 5, p. 901-909 How to Cite?
AbstractThe nano-structural change of hydrated calcium silicate gels (C-(A)-S-H) in Portland cement (PC) and high-sulphate resistance cement (HSR) mortars under wetting-drying cycling conditions in 5% (mass fraction) MgSO4 solution was investigated by Fourier-transform infrared spectroscopy (FTIR), thermogravimetry-tifferential scanning calorimetry (TG-DSC), 29Si magic-angle spinning nuclear magnetic resonance (MAS-NMR), and transmission electron microscopy-energy dispersive X-ray spectroscopy (TEM-EDX). The results show that Al-tetrahedra in C-(A)-S-Hphase is plausibly the weakness during sulphate attack, the Q1 (dimer or end-member in the chain) in the main aluminosilicate tetrahedral chain can be easily attacked by MgSO4 to form M/C-(A)-S-H, and sulphate ions are easily absorbed on the surface of C-(A)-S-H through -Si-O-M2+-1/2SO42-. The chemical compositions of C-(A)-S-H in all the samples before and after sulphate attack were simulated by the tobermorite/jennite (T/J) model. The difference between the nano-structural and the average compositional formulas of C-(A)-S-H gels in two cements after sulphate attack was derived from the (T/J) model. It is necessary for the improvement of the resistance of motors against MgSO4 attack to restrict the expansive corrosion products (i.e., gypsum and AFt) and Al-tetrahedra in the aluminosilicate chain of C-(A)-S-H phase.
Persistent Identifierhttp://hdl.handle.net/10722/341310
ISSN
2023 SCImago Journal Rankings: 0.250

 

DC FieldValueLanguage
dc.contributor.authorZhu, Xiaohong-
dc.contributor.authorLi, Qing-
dc.contributor.authorChen, Ping-
dc.contributor.authorKang, Xiaojuan-
dc.contributor.authorYang, Kai-
dc.contributor.authorYang, Changhui-
dc.date.accessioned2024-03-13T08:41:49Z-
dc.date.available2024-03-13T08:41:49Z-
dc.date.issued2021-
dc.identifier.citationKuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society, 2021, v. 49, n. 5, p. 901-909-
dc.identifier.issn0454-5648-
dc.identifier.urihttp://hdl.handle.net/10722/341310-
dc.description.abstractThe nano-structural change of hydrated calcium silicate gels (C-(A)-S-H) in Portland cement (PC) and high-sulphate resistance cement (HSR) mortars under wetting-drying cycling conditions in 5% (mass fraction) MgSO4 solution was investigated by Fourier-transform infrared spectroscopy (FTIR), thermogravimetry-tifferential scanning calorimetry (TG-DSC), 29Si magic-angle spinning nuclear magnetic resonance (MAS-NMR), and transmission electron microscopy-energy dispersive X-ray spectroscopy (TEM-EDX). The results show that Al-tetrahedra in C-(A)-S-Hphase is plausibly the weakness during sulphate attack, the Q1 (dimer or end-member in the chain) in the main aluminosilicate tetrahedral chain can be easily attacked by MgSO4 to form M/C-(A)-S-H, and sulphate ions are easily absorbed on the surface of C-(A)-S-H through -Si-O-M2+-1/2SO42-. The chemical compositions of C-(A)-S-H in all the samples before and after sulphate attack were simulated by the tobermorite/jennite (T/J) model. The difference between the nano-structural and the average compositional formulas of C-(A)-S-H gels in two cements after sulphate attack was derived from the (T/J) model. It is necessary for the improvement of the resistance of motors against MgSO4 attack to restrict the expansive corrosion products (i.e., gypsum and AFt) and Al-tetrahedra in the aluminosilicate chain of C-(A)-S-H phase.-
dc.languageeng-
dc.relation.ispartofKuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society-
dc.subjectCalcium silicate hydrate gels-
dc.subjectMagnesium sulphate solution-
dc.subjectMortars-
dc.subjectSilicon oxide tetrahedron-
dc.subjectStructural change-
dc.subjectSulphate attack-
dc.titleComposition and Nano-structure of C-(A)-S-H Gels in Cement Pastes after Sulphate Attack-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.14062/j.issn.0454-5648.20200677-
dc.identifier.scopuseid_2-s2.0-85106554720-
dc.identifier.volume49-
dc.identifier.issue5-
dc.identifier.spage901-
dc.identifier.epage909-

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