Sulfate Ions Immobilization of Calcined Layered Double Hydroxides in Hardened Cement Paste and Concrete

The sulfate ions immobilization behavior of calcined layered double hydroxides (CLDHs) in the hardened cement paste was investigated. The experimental results show that the sulfate ions in cement paste are immobilized by CLDHs to reconstruct the layered structure and aggregate around CLDHs. The immo...

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Bibliographic Details
Published in:Journal of Wuhan University of Technology. Materials science edition 2019-12, Vol.34 (6), p.1400-1407
Main Authors: Ma, Juntao, Wang, Daguang, Duan, Ping, Shi, Yanke
Format: Article
Language:English
Subjects:
Cement
Cement paste
Cementitious Material
Chemistry and Materials Science
Ettringite
Hydroxides
Immobilization
Materials Science
Roasting
Sulfate resistance
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Summary:The sulfate ions immobilization behavior of calcined layered double hydroxides (CLDHs) in the hardened cement paste was investigated. The experimental results show that the sulfate ions in cement paste are immobilized by CLDHs to reconstruct the layered structure and aggregate around CLDHs. The immobilization amount of sulfate ions by CLDHs reaches 4.74×10 -3 mol/g, while the increasing amount indicates non-linear relation with the addition of CLDHs. The incorporation of CLDHs decreases the amount of ettringite formed to limit the expansion of cement paste, which decays the sulfate reaction to enhance the sulfate resistance of concrete.
ISSN:1000-2413
1993-0437
DOI:10.1007/s11595-019-2205-9