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Preparation and Corrosive Anion-curing Capability of Layered Double Hydroxide (LDH)/Montmorillonite Composites

Published online by Cambridge University Press:  01 January 2024

Limei Wu*
Affiliation:
School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Mingxi Sun
Affiliation:
School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Xiaolong Wang
Affiliation:
School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Yushen Lu
Affiliation:
Key Laboratory of Clay Mineral Applied Research of Gansu Province, Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
Ning Tang*
Affiliation:
School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Lili Gao
Affiliation:
School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Qing Wang
Affiliation:
School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Ling Hu
Affiliation:
Planning and Finance Division, Shenyang Jianzhu University, Shenyang 110168, China

Abstract

The passive film of reinforcing steel in marine concrete is damaged by the infiltration of chloride and sulfate ions. Layered double hydroxide (LDH) can adsorb anions and release interlayer ions to form passive films due to its ion exchange property. A Mg-Al-NO3 layered double hydroxide/montmorillonite (LDH/Mnt) composite inhibitor was prepared by layer-by-layer self-assembly (LBL) of LDH and Mnt. The structure and morphology of the LDH/Mnt composites were characterized by X-ray diffraction (XRD), laser Raman spectroscopy, N2-adsorption/desorption measurements, and transmission electron microscopy (TEM). The LDH/Mnt composites, as inhibitors of chloride ions and sulfate ions, exhibited high slow-release efficiency. The mass ratio of LDH and Mnt affected the curing capacity of the synthesized composites, and the optimum mass ratio was LDH/Mnt = 1:1 for which slow-release efficiency reached 94.16%.

Information

Type
Original Paper
Copyright
Copyright © Clay Minerals Society 2023

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