期刊
JOURNAL OF BUILDING ENGINEERING
卷 51, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jobe.2022.104301
关键词
Layered double hydroxides; Cement paste coatings; Chlorides; Corrosion resistance
资金
- National Natural Science Foundation of China [51708060, 52002410]
- Fundamental Research Funds for the Central Universities [2020CDJQY-A004]
- Technology Innovation and application demonstration program of Chongqing [cstc2019jscx-msxmX0114]
- National Natural Science Foundation of China (NSFC) [51879292, 51525903]
- Guangdong International Science and Technology Cooperation Programme [2019A050510020]
This paper investigates the corrosion inhibition performance of Ca-Al-NO3 layered double hydroxides (Ca-LDH) modified cementitious coatings on steel bars. The results show that the incorporation of CaLDH increases the chloride consolidation ability of cement paste, effectively inhibiting corrosion of steel bars.
Layer double hydroxides (LDHs) are potential candidates for the application in reinforced concrete. The main perspective of this paper is to prepare cementitious coatings modified with Ca-Al-NO3 layered double hydroxides (Ca-LDH) and investigate its corrosion inhibition performance on steel bars by means of the isothermal adsorption experiment, open-circuit potential (OCP) and linear polarization resistance (LPR). The effect of Ca-LDH dosage on pore structure and chloride binding ability of cement pastes were studied. The primary aim was to design a novel composite coating applied to reinforced concrete. The results show that the incorporation of CaLDH increased the chloride consolidation ability of cement paste. Compared with the uncoated steel bars, the chloride concentration threshold (CCT) of the cement paste coatings with 2% and 4% Ca-LDH increased by 0.07 M and 0.06 M respectively, which effectively inhibited corrosion of steel bars in the simulated concrete pore (SCP) solution with chloride. The incorporation of CaLDH into cement paste reduced its porosity and strengthened the physical barrier effect. Moreover, Ca-LDH had the dual ability of consolidating chlorides and releasing corrosion-inhibiting anions.
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