Calcium Carbonate and Ettringite Induced Efflorescence in CAC- Anhydrite Binary Systems

We focused on the efflorescence induced microstructural evolution of ettringite-rich systems prepared with calcium aluminate cement (CAC) and anhydrite. The effects of anhydrite on the visible efflorescence, and the corresponding capillary absorption of CAC-anhydrite mortars were revealed. The compo...

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Published in:Journal of Wuhan University of Technology. Materials science edition Vol. 39; no. 5; pp. 1129 - 1137
Main Authors: Sun, Zixuan, Chen, Yuting, Xu, Linglin, Liu, Siyu, Yu, Long, Pan, Feng, Wang, Chaoqiang, Wu, Kai, Yang, Zhenghong
Format: Journal Article
Language:English
Published: Wuhan Wuhan University of Technology 01.10.2024
Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,School of Materials Science and Engineering,Tongji University,Shanghai 201804,China%Shanghai Construction No.5(Group)Co.,Ltd.,Shanghai 200063,China%School of Material Sci-ence and Engineering,Chongqing Jiaotong University,Chongqing 400074,China
Subjects:
Cementitious Materials
Chemistry and Materials Science
Materials Science
ettringite
pore structure
efflorescence
phase assemblage
anhydrite
calcium aluminate cement
ISSN:1000-2413, 1993-0437
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Summary:We focused on the efflorescence induced microstructural evolution of ettringite-rich systems prepared with calcium aluminate cement (CAC) and anhydrite. The effects of anhydrite on the visible efflorescence, and the corresponding capillary absorption of CAC-anhydrite mortars were revealed. The composition and microstructure of efflorescence-causing substances were investigated by optical microscope, in-situ Raman spectroscopy, scanning electron microscope, energy dispersive spectrometer, thermogravimetric analysis, and differential scanning calorimetry, at multi-scales. Results indicate that, besides the calcium carbonate, ettringite is another main component of efflorescence-causing substances. Compared with the neat CAC mortars, the addition of anhydrite has a significant effect on the degree of efflorescence by acting on the composition of hydration products and pore structure. In addition, methods are proposed for the prevention of efflorescence of CAC-anhydrite binary system.
ISSN:1000-2413
1993-0437
DOI:10.1007/s11595-024-2980-9