Influence of coarse aggregate settlement induced by vibration on long-term chloride transport in concrete

a numerical study

Journal article (2022)

Authors

Yuxin Cai Shanghai Jiao Tong University, Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure
Qing feng Liu Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, Shanghai Jiao Tong University
Zhaozheng Meng Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, Shanghai Jiao Tong University
Mengzhu Chen Sun Yat-sen University
Weihua Li Sun Yat-sen University
B. Šavija Materials and Environment - CEG
Research Group
Materials and Environment (CEG) (TU Delft)
Copyright: © 2022 Yuxin Cai, Qing feng Liu, Zhaozheng Meng, Mengzhu Chen, Weihua Li, B. Šavija
DOI
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https://doi.org/10.1617/s11527-022-02038-z
Vibration Durability Numerical model CA settlement Chloride transport Corrosion initiation
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Published Date

2022

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

High-frequency vibration helps to improve the compactness of concrete, but also causes the settlement of coarse aggregates (CAs) and then affects the durability of hardened concrete. In this paper, a numerical study combining multi-phase CA settlement model and multi-component ionic transport model is performed to understand the influence of vibration-induced settlement on long-term chloride transport in concrete. Through parametric analysis, the influence mechanism of relevant factors on both chloride profile distribution and reinforcement corrosion initiation is discussed in detail. The results indicate that with the increase of vibration time, a decrease of chloride concentration appears in the bottom part of concrete specimen and a significant increase in the top part, because more CAs deposit in the bottom layer. Due to sedimentation, a more obvious fluctuation of chloride concentration along the height direction can be observed in the concrete mixed with a larger density and particle size of CAs. According to the model prediction, the corrosion of the top steel bar initiates 1.03–1.80 years earlier than that of the bottom steel bar under the same parameters. In practical engineering, special attention should be paid on the stability of fresh concrete and vibrating procedures to avoid obvious CA settlement.