Prediction of effective chloride diffusion coefficient of recycled aggregate concrete based on multiscale analysis

被引：0
|
作者：
Mou X. [1 ]
Wang Y. [1 ]
Lu S. [1 ]
Bao J. [1 ]
Zhang P. [1 ]
Zhang J. [1 ]
机构：
[1] Department of Civil Engineering, Qingdao University of Technology, Qingdao
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2023年 / 40卷 / 05期
基金：
中国国家自然科学基金;
关键词：
chloride ingress; diffusion coefficient; multiscale analysis; N-layered spherical inclusion theory; recycled aggregate concrete;
D O I：
10.13801/j.cnki.fhclxb.20220726.001
中图分类号：
学科分类号：
摘要：
Recycled aggregate concrete is regarded as a kind of heterogeneous composite material composed of mortar matrix phase, recycled aggregate phase and the interfacial transition zone (ITZ-2) phase between new and old mortars. Among them, mortar matrix phase is composed of fine aggregate, hardened cement pastes and the interfacial transition zone (ITZ-1) between them, while the recycled aggregate phase is composed of old aggregate, attached old mortar, old interfacial transition zone (ITZ-3) between them. Based on the N-layer spherical inclusion theory with considering the influence of microscale phase, a five-phase multiscale model of effective chloride diffusion coefficient of recycled aggregate concrete was established. The accuracy and validity of the proposed model were verified by comparing between the experimental and predicted results of steady-state chloride diffusion coefficient of hardened cement paste, mortar and recycled aggregate concrete, respectively. Finally, the influence of the key parameters including the chloride ingress time, the volume fraction of recycled coarse aggregate and the attached mortar content on effective chloride diffusion coefficient was further discussed. The results show that the predicted effective diffusion coefficient agrees well with the experimental results obtained in the literature. It indicates that the proposed model can be universally used to predict the effective chloride diffusion coefficient of recycled aggregate concrete, which provides a theoretical basis for durability evaluation and service life prediction of recycled aggregate concrete exposed to chloride salt environment. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
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页码：2876 / 2884
页数：8
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