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Composition and Nano-structure of C-(A)-S-H Gels in Cement Pastes after Sulphate Attack
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Xiaohong ZHU1, 2, Qing LI1, 3, Ping CHEN1, Xiaojuan KANG4, Kai YANG3, Changhui YANG3
Journal of the Chinese Ceramic Society | 2021, 49(5) : 901 - 909
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Journal of the Chinese Ceramic Society | 2021, 49(5): 901-909
• Research Article •
Composition and Nano-structure of C-(A)-S-H Gels in Cement Pastes after Sulphate Attack
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Xiaohong ZHU1, 2, Qing LI1, 3, Ping CHEN1, Xiaojuan KANG4, Kai YANG3, Changhui YANG3
Affiliations
  • 1.College of Civil and Architectural Engineering, Guilin University of Technology, Guilin 541004, Guangxi, China
  • 2.School of Civil Engineering, University of Leeds, Leeds LS2 9JT, UK
  • 3.College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China
  • 4.Department of Civil Engineering, The University of Hong Kong, Hong Kong 999077, China

    • ZHU Xiaohong(1991-), male, Doctoral candidate. E-mail:

About Author:

ZHU Xiaohong(1991-), male, Doctoral candidate. E-mail:

Published: 2021-05-20 doi: 10.14062/j.issn.0454-5648.20200677
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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-H phase 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.

magnesium sulphate solution  /  sulphate attack  /  calcium silicate hydrate gels  /  silicon oxide tetrahedron  /  structural change  /  mortars
朱效宏, 李青, 陈平, 康晓娟, 杨凯, 杨长辉. 硫酸盐侵蚀条件下C-(A)-S-H组成-结构演化的量化分析. 硅酸盐学报, 2021 , 49 (5) : 901 -909 . DOI: 10.14062/j.issn.0454-5648.20200677
Xiaohong ZHU, Qing LI, Ping CHEN, Xiaojuan KANG, Kai YANG, Changhui YANG. Composition and Nano-structure of C-(A)-S-H Gels in Cement Pastes after Sulphate Attack[J]. Journal of the Chinese Ceramic Society, 2021 , 49 (5) : 901 -909 . DOI: 10.14062/j.issn.0454-5648.20200677
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Year 2021 volume 49 Issue 5
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Article Info
doi: 10.14062/j.issn.0454-5648.20200677
  • Receive Date：2020-09-04
  • Online Date：2026-10-30
  • Published：2021-05-20
Article Data
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History
  • Received：2020-09-04
  • Revised：2020-10-15
Funding
Affiliations
    1.College of Civil and Architectural Engineering, Guilin University of Technology, Guilin 541004, Guangxi, China
    2.School of Civil Engineering, University of Leeds, Leeds LS2 9JT, UK
    3.College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China
    4.Department of Civil Engineering, The University of Hong Kong, Hong Kong 999077, China

Corresponding:

LI Qing(1986-), male, Ph.D., Lecturer. E-mail:
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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