Effect of Carbonation on Chloride Maximum Phenomena of Concrete Subjected to Cyclic Wetting–Drying Conditions: A Numerical and Experimental Study

Xu, Lina; Zhang, Yan; Zhang, Shuyuan; Fan, Shuyuan; Chang, Honglei

doi:10.3390/ma15082874

Cited by 4 publications

(2 citation statements)

References 66 publications

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“…Lu et al [26] studied the effect of the concrete mix ratio, dry-to-wet ratio, and exposure time on chloride ion penetration into concrete under the action of dry and wet cycles; the depth of chloride ion penetration increased with the increase in dry-and-wet-cycle air-drying time and exposure time. Xu et al [27] and Marcos-Meson et al [28] concluded that carbonation will accelerate the chloride ions transport in concrete under dry and wet cycles. Dong et al [29] investigated the chloride ion transport and service life of aeolian sand concrete under dry-wet cycles.…”

Section: Introductionmentioning

confidence: 99%

Multidimensional Transport Experiment and Simulation of Chloride Ions in Concrete Subject to Simulated Dry and Wet Cycles in a Marine Environment

Xu,

He,

et al. 2023

Materials

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Chloride ion erosion is an important factor affecting the durability of marine engineering concrete. In particular, concrete structures in wave splash and tidal zones are subjected to dry and wet cycles and multidimensional diffusion of chloride ions. To investigate the intricate diffusion of chloride ions within concrete under these dynamic conditions, we devised a comprehensive experiment. This experiment encompasses multiple dimensions, involving dry and wet cycles, as well as static immersion. The experiment intends to reveal how chloride ions are distributed in the concrete and clarify the changes that occur in its microstructure. Based on Fick’s second law, the multidimensional diffusion model of chloride ions in concrete under the dry and wet cycles and static immersion was established by comprehensively considering the effects of chloride ion exposure time, environment temperature, relative humidity, and the action of dry and wet cycles. The results show that, under the same conditions, the chloride content in concrete decreases with the increase in penetration depth but increases with the increase in the chloride diffusion dimension and exposure time. Dry and wet cycles and multidimensional diffusion of chloride ions increase the development of cracks and pores in the concrete structure and generate large quantities of C3A·CaCl2·10H2O, which will exacerbate the chloride ion transport rate and penetration depth of concrete. Under the same exposure time and penetration depth, the chloride ion content in concrete under two-dimensional (2D) and three-dimensional (3D) diffusion under dry and wet cycles was 1.09~4.08 times higher than that under one-dimensional (1D) diffusion. The correlation coefficients between the simulation results of the multidimensional transport model of chloride ions in concrete under multi-factor coupling and the experimental results were all greater than 0.95, and the model can be utilized to predict the distribution of chloride ion concentration in concrete.

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Section: Introductionmentioning

confidence: 99%

Multidimensional Transport Experiment and Simulation of Chloride Ions in Concrete Subject to Simulated Dry and Wet Cycles in a Marine Environment

Xu,

He,

et al. 2023

Materials

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“…It is of great significance to investigate the diffusion behavior of chloride ion in concrete. In recent decades, much theoretical [2,3], experimental [4][5][6], and numerical [7][8][9] research on chloride ion diffusion in concrete have been done, and remarkable research findings also have been achieved. For example, CollePardi et al [10] established the theoretical basis model of chloride ion diffusion in concrete by introducing Fick's Second Law.…”

Section: Introductionmentioning

confidence: 99%

Effect of Interface Transition Zone and Coarse Aggregate on Microscopic Diffusion Behavior of Chloride Ion

et al. 2022

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Concrete is a multiphase composite material composed of coarse aggregate, cement mortar, and interface transition zone (ITZ). It is of great significance to study the effect of ITZ and coarse aggregate on chloride microscopic diffusion behavior for predicting the service life of reinforced concrete (RC) structures. By introducing the random distribution function, a random coarse aggregate model considering the randomness of the thickness of the ITZ was established. Furthermore, a two-dimensional (2D) chloride ion diffusion mesoscopic model was developed by specifying different diffusion properties for different phase materials of concrete. Moreover, the effects of coarse aggregate rate, ITZ thickness, and ITZ diffusion property on chloride ion diffusion behavior were investigated in this paper. The research showed that the aggregate has hindrance and agglomeration action on chloride ion diffusion. Although the volume content of the ITZ was very small, less than 0.2% of the total volume of concrete, the effect of the ITZ on the chloride diffusion in concrete cannot be ignored. More importantly, the mechanism of promoting chloride diffusion in the ITZ was revealed through the chloride diffusion trajectory. The research revealed the transmission mechanism of chloride ions in the meso-structure of concrete and provides theoretical support for the design of RC structures in coastal areas.

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Multi-scale peridynamic investigation of chloride penetration in concrete under drying-wetting cycles

Liu

Zhou

et al. 2023

Engineering Analysis with Boundary Elements

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Effect of Carbonation on Chloride Maximum Phenomena of Concrete Subjected to Cyclic Wetting–Drying Conditions: A Numerical and Experimental Study

Cited by 4 publications

References 66 publications

Multidimensional Transport Experiment and Simulation of Chloride Ions in Concrete Subject to Simulated Dry and Wet Cycles in a Marine Environment

Multidimensional Transport Experiment and Simulation of Chloride Ions in Concrete Subject to Simulated Dry and Wet Cycles in a Marine Environment

Effect of Interface Transition Zone and Coarse Aggregate on Microscopic Diffusion Behavior of Chloride Ion

Multi-scale peridynamic investigation of chloride penetration in concrete under drying-wetting cycles

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