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Compositional-structural Gradient Change of C(N)-A-S-H(I) Gel in Alkali-activated Slag after Magnesium Sulphate Attack
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Xiaohong ZHU1, 2, Qing LI1, 3, Deyi XIONG3, Kai YANG3, Changhui YANG3, Rongjin LIU1
Journal of the Chinese Ceramic Society | 2021, 49(10) : 2276 - 2285
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Journal of the Chinese Ceramic Society | 2021, 49(10): 2276-2285
Compositional-structural Gradient Change of C(N)-A-S-H(I) Gel in Alkali-activated Slag after Magnesium Sulphate Attack
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Xiaohong ZHU1, 2, Qing LI1, 3, Deyi XIONG3, Kai YANG3, Changhui YANG3, Rongjin LIU1
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

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

About Author:

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

Published: 2021-10-20 doi: 10.14062/j.issn.0454-5648.20200918
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This paper presented the gradient changes of the characteristics of C(N)-A-S-H (Calcium(Sodium)-Aluminium-Silicate Hydrates) gel in alkali-activated slag (AAS) mortars subjected to sulphate attack in 10% (in mass fraction) MgSO4 solution by 29Si solid-state magic-angle Spinning nuclear magnetic resonance (SS MAS-NMR), and high-resolution transmission electron microscopy-energy dispersive X-ray spectroscopy (HR TEM-EDX). The results show that the outer layer with the thickness of 0.5-3 mm after attack is mainly composed of Si-Al gel, the middle-level layer with the thickness of 3-6 mm is M/C(N)-A-S-H gel, and the internal layer with the thickness of 6-9 mm is mainly composed of C(N)-A-S-H gel (which was almost not attacked. The stable crystal tobermorite (Ca/Si ratio=0.98) and hydrotalcite-like phase (Mg/Al ratio=2.39) could not be destroyed by sulphate attack. However, the main chain of C(N)-A-S-H gel is readily attacked by sulphate at [AlO4] bridging tetrahedra (BT). Meanwhile, the magnesium sulphate initially results in de-calcium phenomenon (Mg will replace Ca), and then generates the de-aluminium phenomenon, finally forming the Si-Al gel (main product in the out layer) when removing Ca and partial Al from the gel and charge-balancing the gel by abundant Mg ions.

magnesium sulphate  /  C(N)-A-S-H gel  /  silicon oxide tetrahedron  /  structural change  /  gradient
朱效宏, 李青, 熊德意, 杨凯, 杨长辉, 刘荣进. 硫酸镁侵蚀后碱矿渣水泥中C(N)-A-S-H(I)组成-结构梯度变化. 硅酸盐学报, 2021 , 49 (10) : 2276 -2285 . DOI: 10.14062/j.issn.0454-5648.20200918
Xiaohong ZHU, Qing LI, Deyi XIONG, Kai YANG, Changhui YANG, Rongjin LIU. Compositional-structural Gradient Change of C(N)-A-S-H(I) Gel in Alkali-activated Slag after Magnesium Sulphate Attack[J]. Journal of the Chinese Ceramic Society, 2021 , 49 (10) : 2276 -2285 . DOI: 10.14062/j.issn.0454-5648.20200918
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Year 2021 volume 49 Issue 10
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Article Info
doi: 10.14062/j.issn.0454-5648.20200918
  • Receive Date：2020-12-11
  • Online Date：2026-10-30
  • Published：2021-10-20
Article Data
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History
  • Received：2020-12-11
  • Revised：2021-01-04
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

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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