三维混凝土细观模型构建与骨料形态对氯离子扩散影响的数值研究

doi:10.11896/cldb.22070243

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Abstract The corrosion of steel bars caused by chloride ion erosion is the primary factor affecting the durability of concrete structures, and the characteristics of aggregate have an important influence on the chloride ion transport behavior in concrete. In this study, an efficient method for constructing meso-scalethree-dimensional geometric model of concrete was proposed, which can realize the generation and packing of gravel, pebbles and flake aggregate commonly used in engineering. The generated geometric model was further applied to the prediction of chloride transport behavior, and validated against the third-party experimental data. The three-dimensional concrete mesoscopic model proposed in this work is able to quantify the effect of aggregate morphological characteristics such as aggregate shape, volume fraction, particle size and conti-nuous gradation on chloride ion transport in a comprehensive way. In addition, the influence of uneven aggregate distribution caused by vibration on chloride ion transport was also investigated. The results show that the increase of tortuous degree and volume fraction of aggregate decreases the diffusion rate of chloride ions. Concrete with continuous aggregate gradation, in which aggregate with small particle size can be filled in the gap of aggregate with large particle size, has higher chlorine resistance than concrete with single aggregate gradation. The uneven aggregate distribution caused by vibration has a significant influence on the durability of concrete.

Key words： concrete chloride aggregate shape meso-scale 3D model

Published: Online: 2023-12-19

CLC number:

TU528.041

Fund:Natural Science Foundation of China (52222805), the Natural Science Foundation of Shanghai, China (22ZR1431400), and the Oceanic Interdisciplinary Program of Shanghai Jiao Tong University, China (SL2021MS016).

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	ZHOU Yu
	LIU Qingfeng

Cite this article:

ZHOU Yu,LIU Qingfeng. 3D Concrete Mesoscopic Modelling and Numerical Study on the Influence of Aggregate Morphology on Chloride Diffusion[J]. Materials Reports, 2023, 37(24): 22070243-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22070243 OR http://www.mater-rep.com/EN/Y2023/V37/I24/22070243

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