Chloride corrosion resistance of cement mortar with recycled concrete powder modified by nano-silica

Xiaoyan Liu; Ruidan Liu; Xian Xie; Junqing Zuo; Kai Lyu; Surendra P. Shah

doi:10.1016/j.conbuildmat.2022.129907

Chloride corrosion resistance of cement mortar with recycled concrete powder modified by nano-silica

Xiaoyan Liu^*, Ruidan Liu, Xian Xie, Junqing Zuo, Kai Lyu, Surendra P. Shah

^*Corresponding author for this work

Civil and Environmental Engineering

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

In the marine environment, the service life of coastal structures can be significantly reduced on account of chloride corrosion. This study employed nano-silica (NS) to improve the chloride corrosion resistance of mortar samples prepared with recycled concrete powder (RCP). The free chloride ion concentration and mechanical strength of mortar samples in 3.5% NaCl solution up to 12 months were measured. Rapid chloride migration (RCM) and electric flux experiments were carried out. Compared with the pure RCP mortar, the 2% NS incorporated RCP mortar experienced a significant decrease in the chloride ion diffusion coefficient, electric flux and corrosion rate of internal rebar. Moreover, the RCP mortar with 2% NS also had the slowest increase in the free chloride ion concentration and surface chloride ion concentration. The addition of RCP in cement mortar reduced the chloride corrosion resistance, while the inclusion of 2% NS compensated for the RCP induced degradation, resulting in an improvement in chloride corrosion resistance. The X-ray diffraction (XRD), mercury intrusion porosimetry (MIP), and scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDS) results showed that the addition of RCP and NS consumed Ca(OH)₂ to generate more C-S-H gels and C-A-S-H gels and thereby improved the physical chloride-binding ability of the sample. In addition, the formation of Friedel's salt via the combination of chloride ion with aluminosilicate further improved the chlorine ion corrosion resistance.

Original language	English (US)
Article number	129907
Journal	Construction and Building Materials
Volume	364
DOIs	https://doi.org/10.1016/j.conbuildmat.2022.129907
State	Published - Jan 18 2023

Funding

The authors gratefully acknowledge the financial support of Jiangsu Science and Technology Department of China (No. BE2022605), the National Natural Science Foundation of China (No. 51879093 and 52108206), the Fundamental Research Funds for the Central Universities (No. B220202010), and the National Key R&D Program of China (No. 2019YFC1906200). The authors also thank the Jiangsu Research Institute of Building Science Co., Ltd. and the state key laboratory of high-performance civil engineering materials for funding this research project. The authors gratefully acknowledge the financial support of Jiangsu Science and Technology Department of China (No. BE2022605), the National Natural Science Foundation of China (No. 51879093 and 52108206), the Fundamental Research Funds for the Central Universities (No. B220202010), and the National Key R&D Program of China (No. 2019YFC1906200). The authors also thank the Jiangsu Research Institute of Building Science Co. Ltd. and the state key laboratory of high-performance civil engineering materials for funding this research project.

Keywords

Chloride
Nano-silica
Natural immersion
RCM
Recycled concrete powder

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

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10.1016/j.conbuildmat.2022.129907

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title = "Chloride corrosion resistance of cement mortar with recycled concrete powder modified by nano-silica",

abstract = "In the marine environment, the service life of coastal structures can be significantly reduced on account of chloride corrosion. This study employed nano-silica (NS) to improve the chloride corrosion resistance of mortar samples prepared with recycled concrete powder (RCP). The free chloride ion concentration and mechanical strength of mortar samples in 3.5% NaCl solution up to 12 months were measured. Rapid chloride migration (RCM) and electric flux experiments were carried out. Compared with the pure RCP mortar, the 2% NS incorporated RCP mortar experienced a significant decrease in the chloride ion diffusion coefficient, electric flux and corrosion rate of internal rebar. Moreover, the RCP mortar with 2% NS also had the slowest increase in the free chloride ion concentration and surface chloride ion concentration. The addition of RCP in cement mortar reduced the chloride corrosion resistance, while the inclusion of 2% NS compensated for the RCP induced degradation, resulting in an improvement in chloride corrosion resistance. The X-ray diffraction (XRD), mercury intrusion porosimetry (MIP), and scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDS) results showed that the addition of RCP and NS consumed Ca(OH)2 to generate more C-S-H gels and C-A-S-H gels and thereby improved the physical chloride-binding ability of the sample. In addition, the formation of Friedel's salt via the combination of chloride ion with aluminosilicate further improved the chlorine ion corrosion resistance.",

keywords = "Chloride, Nano-silica, Natural immersion, RCM, Recycled concrete powder",

author = "Xiaoyan Liu and Ruidan Liu and Xian Xie and Junqing Zuo and Kai Lyu and Shah, {Surendra P.}",

note = "Funding Information: The authors gratefully acknowledge the financial support of Jiangsu Science and Technology Department of China (No. BE2022605), the National Natural Science Foundation of China (No. 51879093 and 52108206), the Fundamental Research Funds for the Central Universities (No. B220202010), and the National Key R&D Program of China (No. 2019YFC1906200). The authors also thank the Jiangsu Research Institute of Building Science Co., Ltd. and the state key laboratory of high-performance civil engineering materials for funding this research project. Funding Information: The authors gratefully acknowledge the financial support of Jiangsu Science and Technology Department of China (No. BE2022605), the National Natural Science Foundation of China (No. 51879093 and 52108206), the Fundamental Research Funds for the Central Universities (No. B220202010), and the National Key R&D Program of China (No. 2019YFC1906200). The authors also thank the Jiangsu Research Institute of Building Science Co. Ltd. and the state key laboratory of high-performance civil engineering materials for funding this research project. Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",

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doi = "10.1016/j.conbuildmat.2022.129907",

language = "English (US)",

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T1 - Chloride corrosion resistance of cement mortar with recycled concrete powder modified by nano-silica

AU - Liu, Xiaoyan

AU - Liu, Ruidan

AU - Xie, Xian

AU - Zuo, Junqing

AU - Lyu, Kai

AU - Shah, Surendra P.

N1 - Funding Information: The authors gratefully acknowledge the financial support of Jiangsu Science and Technology Department of China (No. BE2022605), the National Natural Science Foundation of China (No. 51879093 and 52108206), the Fundamental Research Funds for the Central Universities (No. B220202010), and the National Key R&D Program of China (No. 2019YFC1906200). The authors also thank the Jiangsu Research Institute of Building Science Co., Ltd. and the state key laboratory of high-performance civil engineering materials for funding this research project. Funding Information: The authors gratefully acknowledge the financial support of Jiangsu Science and Technology Department of China (No. BE2022605), the National Natural Science Foundation of China (No. 51879093 and 52108206), the Fundamental Research Funds for the Central Universities (No. B220202010), and the National Key R&D Program of China (No. 2019YFC1906200). The authors also thank the Jiangsu Research Institute of Building Science Co. Ltd. and the state key laboratory of high-performance civil engineering materials for funding this research project. Publisher Copyright: © 2022 Elsevier Ltd

PY - 2023/1/18

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N2 - In the marine environment, the service life of coastal structures can be significantly reduced on account of chloride corrosion. This study employed nano-silica (NS) to improve the chloride corrosion resistance of mortar samples prepared with recycled concrete powder (RCP). The free chloride ion concentration and mechanical strength of mortar samples in 3.5% NaCl solution up to 12 months were measured. Rapid chloride migration (RCM) and electric flux experiments were carried out. Compared with the pure RCP mortar, the 2% NS incorporated RCP mortar experienced a significant decrease in the chloride ion diffusion coefficient, electric flux and corrosion rate of internal rebar. Moreover, the RCP mortar with 2% NS also had the slowest increase in the free chloride ion concentration and surface chloride ion concentration. The addition of RCP in cement mortar reduced the chloride corrosion resistance, while the inclusion of 2% NS compensated for the RCP induced degradation, resulting in an improvement in chloride corrosion resistance. The X-ray diffraction (XRD), mercury intrusion porosimetry (MIP), and scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDS) results showed that the addition of RCP and NS consumed Ca(OH)2 to generate more C-S-H gels and C-A-S-H gels and thereby improved the physical chloride-binding ability of the sample. In addition, the formation of Friedel's salt via the combination of chloride ion with aluminosilicate further improved the chlorine ion corrosion resistance.

AB - In the marine environment, the service life of coastal structures can be significantly reduced on account of chloride corrosion. This study employed nano-silica (NS) to improve the chloride corrosion resistance of mortar samples prepared with recycled concrete powder (RCP). The free chloride ion concentration and mechanical strength of mortar samples in 3.5% NaCl solution up to 12 months were measured. Rapid chloride migration (RCM) and electric flux experiments were carried out. Compared with the pure RCP mortar, the 2% NS incorporated RCP mortar experienced a significant decrease in the chloride ion diffusion coefficient, electric flux and corrosion rate of internal rebar. Moreover, the RCP mortar with 2% NS also had the slowest increase in the free chloride ion concentration and surface chloride ion concentration. The addition of RCP in cement mortar reduced the chloride corrosion resistance, while the inclusion of 2% NS compensated for the RCP induced degradation, resulting in an improvement in chloride corrosion resistance. The X-ray diffraction (XRD), mercury intrusion porosimetry (MIP), and scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDS) results showed that the addition of RCP and NS consumed Ca(OH)2 to generate more C-S-H gels and C-A-S-H gels and thereby improved the physical chloride-binding ability of the sample. In addition, the formation of Friedel's salt via the combination of chloride ion with aluminosilicate further improved the chlorine ion corrosion resistance.

KW - Chloride

KW - Nano-silica

KW - Natural immersion

KW - RCM

KW - Recycled concrete powder

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Chloride corrosion resistance of cement mortar with recycled concrete powder modified by nano-silica

Abstract

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Keywords

ASJC Scopus subject areas

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