Research on the Chloride Ion Diffusion Behavior and Modified Diffusion Model of Recycled Concrete with Varying Water-Cement Ratios and Recycled Coarse Aggregate Volume Fractions

YANG Ming; CHEN Yangli; WANG Yuanda; ZHANG Hongru; ZHANG Jingbo

doi:10.3724/j.gyjz.G23092618

Volume 55 Issue 3

Mar. 2025

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2025 > 55(3): 245-254

YANG Ming, CHEN Yangli, WANG Yuanda, ZHANG Hongru, ZHANG Jingbo. Research on the Chloride Ion Diffusion Behavior and Modified Diffusion Model of Recycled Concrete with Varying Water-Cement Ratios and Recycled Coarse Aggregate Volume Fractions[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(3): 245-254. doi: 10.3724/j.gyjz.G23092618

Citation:

YANG Ming, CHEN Yangli, WANG Yuanda, ZHANG Hongru, ZHANG Jingbo. Research on the Chloride Ion Diffusion Behavior and Modified Diffusion Model of Recycled Concrete with Varying Water-Cement Ratios and Recycled Coarse Aggregate Volume Fractions[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(3): 245-254. doi: 10.3724/j.gyjz.G23092618

Citation:

YANG Ming, CHEN Yangli, WANG Yuanda, ZHANG Hongru, ZHANG Jingbo. Research on the Chloride Ion Diffusion Behavior and Modified Diffusion Model of Recycled Concrete with Varying Water-Cement Ratios and Recycled Coarse Aggregate Volume Fractions[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(3): 245-254. doi: 10.3724/j.gyjz.G23092618

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Research on the Chloride Ion Diffusion Behavior and Modified Diffusion Model of Recycled Concrete with Varying Water-Cement Ratios and Recycled Coarse Aggregate Volume Fractions

doi: 10.3724/j.gyjz.G23092618

1. CCCC Second Highway Consultants Co., Ltd., Wuhan 430056, China;
2. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China;
3. China University of Geosciences (Wuhan), Wuhan 430070, China

Received Date: 2023-09-26
Available Online: 2025-06-07
Publish Date: 2025-03-20

Abstract

Abstract

The utilization of recycled aggregate （RA） in the production of recycled aggregate concrete （RAC） is a key method for reusing construction solid waste. However， compared to natural aggregate concrete （NAC）， RAC exhibits poorer resistance to chloride ion （Cl^-） ingress. This study aimed to investigate the distribution of Cl^- in RAC under one-dimensional chloride ion diffusion， considering the influence of different water-cement ratios （w/c） and recycled aggregate volume fractions （V_RCA）. Fick’s second law was used to determine the Cl^-diffusion coefficient of RAC.The time-varying models for the chloride ion diffusion coefficient considering the effects of w/c and V_RCAwere established， and the chloride ion concentration distribution models were modified accordingly. Microhardness testing was conducted to assess the effects of w/c and V_RCA on the micro-mechanical properties of each meso-scale material phase， the thickness of the interfacial transition zone （ITZ） in RAC， and volume fractions of multiple material phases in RAC. The results indicated that an increase in w/c led to an increase in the Cl^- diffusion coefficientof RAC， attributed to the thickening of the water film surrounding the aggregate， resulting in an increased thickness of ITZ₁ and ITZ₃. The enhancement effect of the interface transition zone on chloride ion transport was significant. Furthermore， as V_RCA increased， the volume fraction of old aggregate volume increased， and the dilution effect and tortuosity effect became more pronounced compared to the interface transition zone effect， leading to a decrease in the Cl^- diffusion coefficient with increasing V_RCA.
- recycled aggregate concrete,
- material phase on meso-scale,
- interfacial transition zone,
- chlorideion diffusion

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References(33)

References

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