粗骨料形状对混凝土氯离子扩散性能影响的数值模拟研究

doi:10.11896/cldb.21030145

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Abstract Aggregates (such as pebbles and crushed stones) are irregular in practice, which significantly affects the diffusion of chloride ions in concrete. It is important to characterize the aggregate shape and study its influence on the chloride ion diffusion of concrete. By using computer simulation technology, a method is proposed to construct the numerical model of pebble and crushed stone. Taking real aggregate size distribution as input parameters, the structural characteristics of concrete at meso-scale are successfully represented so that the diffusion process of chloride ions in concrete and the quantitative relationship among aggregate volume fraction, shape, interface transition zone and chloride ion diffusion coefficient can be determined. It is found that the apparent chloride ion diffusion coefficient of concrete decreases with the coarse aggregates fraction and the degree of irregularity increasing, while the interfacial transition zone enhances the chloride diffusion ability. The size of aggregate has a certain effect on the diffusion of chloride ions in the interfacial transition zone of concrete. Considering the effect of aggregate size, it is verified that the thickness of the interfacial transition zone of the test concrete is between 30 μm and 50 μm. The calculated chloride diffusion coefficients are in good agreement with the experimental results, which validates the proposed simulation method.

Key words： chloride ion diffusion coarse aggregate irregular shape numerical simulation

Published: Online: 2022-05-24

CLC number:

TU528

Fund:National Key R & D Program of China (2018YFC0705400).

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	PAN Shiting
	LI Kai
	ZHANG Chaohui
	SHI Caijun

Cite this article:

PAN Shiting,LI Kai,ZHANG Chaohui, et al. Influence of Coarse Aggregate Shape on Chloride Diffusivity in Concrete by Numerical Modelling[J]. Materials Reports, 2022, 36(10): 21030145-9.

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http://www.mater-rep.com/EN/10.11896/cldb.21030145 OR http://www.mater-rep.com/EN/Y2022/V36/I10/21030145

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