基于残余砂浆附着特征的再生混凝土硫酸盐传输模型

doi:10.11896/cldb.23040046

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Abstract The existing model of recycled concrete did not fully consider the characteristics of attached mortar, resulting in the lack of the new mortar-aggregate interface transition zone in the model, and the sulfate transfer model was inconsistent with the actual situation. In this work, the volume of the three-dimensional aggregate was converted into a two-dimensional plane circle according to the Valerian formula, and the aggregates are divided into two parts, the attached mortar and the aggregate according to the characteristics of the attached mortar measured by the image analysis method. Using Monte Carlo equations, the divided recycled aggregates were randomly put into the concrete system, and a six-phase digital model of recycled concrete was established. Through the process of determining the cross-sectional area of recycled aggregate and establishing the recycled aggregate database, a method for expressing the adhesion characteristics of the attached mortar of recycled aggregate in the six-phase concrete digital model was proposed. Based on Fick’s second law, combined with the analysis of the influence of porosity on the diffusion coefficient of each phase in recycled concrete, the diffusion coefficient equation of each phase in recycled concrete was proposed. The two-dimensional visualization of six-phase recycled concrete was realized by finite element software, and the sulfate ion transport model of six-phase recycled concrete was established. Comparing the experimental test value with the model calculation value, it is concluded that the test result is in good agreement with the calculation result. The theoretical calculation result is consistent with the change of the ion transmission depth measured in the experiment. The sulfate transport model of recycled concrete based on the adhesion characteristics of attached mortar is reasonable.

Key words： highway engineering recycled concrete attached mortar coverage rate sulfate ion model

Published: 10 August 2024 Online: 2024-08-29

CLC number:

U414

Fund:Natural Science Foundation of Qinghai Province (2021-ZJ-765).

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	Articles by authors
	GUAN Bowen
	ZHANG Shuowen
	WU Jiayu
	WANG Faping
	CHEN Xiaokun

Cite this article:

GUAN Bowen,ZHANG Shuowen,WU Jiayu, et al. Sulfate Ion Transfer Model of Recycled Concrete Based on the Characterization of Attached Mortar[J]. Materials Reports, 2024, 38(15): 23040046-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23040046 OR http://www.mater-rep.com/EN/Y2024/V38/I15/23040046

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