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Nano-Structural Change of C(N)-A-S-H Gel in Alkali-Activated Slag Pastes Subjected to Wetting-Drying Cyclic Sulphate Attack
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Xiaohong ZHU1, Qing LI2, Xiaojuan KANG3, Jiaxin DENG2, Kai YANG2
Journal of the Chinese Ceramic Society | 2021, 49(11) : 2529 - 2537
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Journal of the Chinese Ceramic Society | 2021, 49(11): 2529-2537
• Research Article •
Nano-Structural Change of C(N)-A-S-H Gel in Alkali-Activated Slag Pastes Subjected to Wetting-Drying Cyclic Sulphate Attack
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Xiaohong ZHU1, Qing LI2, Xiaojuan KANG3, Jiaxin DENG2, Kai YANG2
Affiliations
  • 1.School of Civil Engineering, University of Leeds, Leeds LS2 9JT, UK
  • 2.College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China
  • 3.Department of Civil Engineering, The University of Hong Kong, Hong Kong 999077, China

    • ZHU Xiaohong (1991-), male, Ph. D., Research Associate. E-mail:

About Author:

ZHU Xiaohong (1991-), male, Ph. D., Research Associate. E-mail:

Published: 2021-11-20 doi: 10.14062/j.issn.0454-5648.20210038
Outline
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Nano-structural change of calcium(sodium) aluminium silicate hydrates (C(N)-A-S-H) gel in alkali-activated slag (AAS) mortars after wetting-drying cyclic attack in 5 % (mass fraction, the same below) and 10% sulphate solutions was investigated. The structural and compositional changes of aluminosilicate chains in the main binding phases (C(N)-A-S-H) in AAS mortars were analyzed by Fourier-transform infrared spectroscopy, thermogravimetry-differential scanning calorimetry, 29Si magic angle spinning nuclear magnetic resonance, backscattered scanning electron microscopy and transmission electron microscopy-energy dispersive X-ray spectroscopy. The results show that the sulphate attack increases the degree of reaction of ground granulated blast-furnace slag regardless of sulphate salt type. The main corrosion products in MgSO4 solutions are gypsum, which is not detected in the samples subjected to Na2SO4 solutions. The C(N)-A-S-H with longer chains prefers to be attacked in MgSO4 solutions, whilst the end-members of the chains or short chains of C(N)-A-S-H are broken in Na2SO4 solutions. The C(N)-A-S-H after cyclic water attack is a mixture of tobermorite/jennite dimer to undecamer (T/J2-T/J11), while the Na2SO4 solutions attack results in the destroy of shorter chains and the increase of protonation (or Na-balanced ratio), thus forming a new C(N)-A-S-H gel.

alkali-activated slag cement  /  sulphate  /  wetting-drying cycle  /  gel  /  silicon oxide tetrahedron  /  structural change  /  attack
朱效宏, 李青, 康晓娟, 邓加鑫, 杨凯. 干湿循环硫酸盐环境下碱矿渣水泥C(N)-A-S-H凝胶结构演化规律. 硅酸盐学报, 2021 , 49 (11) : 2529 -2537 . DOI: 10.14062/j.issn.0454-5648.20210038
Xiaohong ZHU, Qing LI, Xiaojuan KANG, Jiaxin DENG, Kai YANG. Nano-Structural Change of C(N)-A-S-H Gel in Alkali-Activated Slag Pastes Subjected to Wetting-Drying Cyclic Sulphate Attack[J]. Journal of the Chinese Ceramic Society, 2021 , 49 (11) : 2529 -2537 . DOI: 10.14062/j.issn.0454-5648.20210038
Appendix
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Year 2021 volume 49 Issue 11
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Article Info
doi: 10.14062/j.issn.0454-5648.20210038
  • Receive Date：2020-12-11
  • Online Date：2026-10-30
  • Published：2021-11-20
Article Data
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History
  • Received：2020-12-11
  • Revised：2021-04-10
Funding
Affiliations
    1.School of Civil Engineering, University of Leeds, Leeds LS2 9JT, UK
    2.College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China
    3.Department of Civil Engineering, The University of Hong Kong, Hong Kong 999077, China

Corresponding:

YANG Kai (1982-), male, Ph. D., Associate Professor. 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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