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Article: Composition and Nano-structure of C-(A)-S-H Gels in Cement Pastes after Sulphate Attack
Title | Composition and Nano-structure of C-(A)-S-H Gels in Cement Pastes after Sulphate Attack |
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Authors | |
Keywords | Calcium silicate hydrate gels Magnesium sulphate solution Mortars Silicon oxide tetrahedron Structural change Sulphate attack |
Issue Date | 2021 |
Citation | Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society, 2021, v. 49, n. 5, p. 901-909 How to Cite? |
Abstract | The 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 Identifier | http://hdl.handle.net/10722/341310 |
ISSN | 2023 SCImago Journal Rankings: 0.250 |
DC Field | Value | Language |
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dc.contributor.author | Zhu, Xiaohong | - |
dc.contributor.author | Li, Qing | - |
dc.contributor.author | Chen, Ping | - |
dc.contributor.author | Kang, Xiaojuan | - |
dc.contributor.author | Yang, Kai | - |
dc.contributor.author | Yang, Changhui | - |
dc.date.accessioned | 2024-03-13T08:41:49Z | - |
dc.date.available | 2024-03-13T08:41:49Z | - |
dc.date.issued | 2021 | - |
dc.identifier.citation | Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society, 2021, v. 49, n. 5, p. 901-909 | - |
dc.identifier.issn | 0454-5648 | - |
dc.identifier.uri | http://hdl.handle.net/10722/341310 | - |
dc.description.abstract | The 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.language | eng | - |
dc.relation.ispartof | Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | - |
dc.subject | Calcium silicate hydrate gels | - |
dc.subject | Magnesium sulphate solution | - |
dc.subject | Mortars | - |
dc.subject | Silicon oxide tetrahedron | - |
dc.subject | Structural change | - |
dc.subject | Sulphate attack | - |
dc.title | Composition and Nano-structure of C-(A)-S-H Gels in Cement Pastes after Sulphate Attack | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.14062/j.issn.0454-5648.20200677 | - |
dc.identifier.scopus | eid_2-s2.0-85106554720 | - |
dc.identifier.volume | 49 | - |
dc.identifier.issue | 5 | - |
dc.identifier.spage | 901 | - |
dc.identifier.epage | 909 | - |