ORCID
- Long yuan Li: 0000-0002-5982-0965
Document Type
Article
Abstract
This paper presents an analytical approach to calculate the effective diffusion coefficient of chlorides in concrete with both natural and recycled concrete aggregates. In the approach the concrete is treated as a composite consisting of three phases, namely mortar, natural aggregate plus interfacial transition zone, and recycled concrete aggregate plus interfacial transition zone. The effective diffusion coefficient of chlorides in the composite is calculated through two steps. The first step is to calculate the effective diffusion coefficients of chlorides in the natural aggregate plus interfacial transition zone and in the recycled concrete aggregate plus interfacial transition zone by using multilayer spherical approximation, the results of which provide the information about the quality of recycled concrete aggregate in terms of chloride penetration resistance. The second step is to calculate the effective diffusion coefficient of chlorides in the three-phase concrete composite by using effective medium approximation, the results of which provide the information about the influence of recycled concrete aggregate on the diffusivity of recycled aggregate concrete. The analytical expression of the effective diffusion coefficient is derived and carefully compared with the results obtained from both the experiments and numerical simulations, which demonstrates that the present analytical model is rational and reliable. The analytical expression presented can be used to predict the service life of recycled aggregate concrete exposed to chloride environment.
DOI Link
Publication Date
2023-01-15
Publication Title
Science of the Total Environment
Volume
856
Issue
2
ISSN
0048-9697
Acceptance Date
2022-09-29
Deposit Date
2022-03-11
Embargo Period
2022-11-04
Funding
The authors would like to acknowledge the financial support received from the European Commission Research Executive Agency via a Marie Skłodowska-Curie Research and Innovation Staff Exchange project (H2020-MSCA-RISE-2017, TRAC-777823).
Keywords
Chloride, Diffusion coefficient, Recycled concrete aggregate, Modelling, Concrete
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Recommended Citation
Yuan, W., Mao, L., & Li, L. (2023) 'A two-step approach for calculating chloride diffusion coefficient in concrete with both natural and recycled concrete aggregates', Science of the Total Environment, 856(2). Available at: 10.1016/j.scitotenv.2022.159197
