Numerical Simulation of Water Transport in Unsaturated Recycled Aggregate Concrete
The old mortar attached to recycled aggregate (RA) is the main reason for the difference in water movement between RA concrete (RAC) and natural aggregate concrete. In this study, considering the old and new interfacial transition zones, a five-phase composite model for describing the water transpor...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2020-09-01
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| Series: | Frontiers in Materials |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fmats.2020.560621/full |
| _version_ | 1818031885688766464 |
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| author | Zhaolin Liu Zhaolin Liu Peng Zhang Jiuwen Bao Yu Hu |
| author_facet | Zhaolin Liu Zhaolin Liu Peng Zhang Jiuwen Bao Yu Hu |
| author_sort | Zhaolin Liu |
| collection | DOAJ |
| description | The old mortar attached to recycled aggregate (RA) is the main reason for the difference in water movement between RA concrete (RAC) and natural aggregate concrete. In this study, considering the old and new interfacial transition zones, a five-phase composite model for describing the water transport and distribution in RAC is established at the mesoscale. The key parameters describing water unsaturated transport in two types of mortar, saturated hydraulic conductivity (Ks) and van Genuchten model parameters (α, n), are obtained through the constant-head permeability test and isothermal adsorption test. By using the finite element method, the numerical simulations of unsaturated moisture movement in the homogeneous mortar, natural aggregate concrete, and five-phase RAC are systematically carried out. The proposed water transport model in the matrix is validated by comparison with the available experimental findings from the literature. The results show that the model can well predict unsaturated water transport in cement-based materials, including RAC. A parameter sensitivity analysis is undertaken to ascertain the main influencing factors of water transport in RAC. It is concluded that the RA replacement rate (Rra), the thickness of the old mortar (dm), and the aggregate volume fraction (Fa) are the primary parameters affecting moisture movement in RAC. |
| first_indexed | 2024-12-10T05:58:35Z |
| format | Article |
| id | doaj.art-007d6045f6744ba19c33a3cffacba151 |
| institution | Directory Open Access Journal |
| issn | 2296-8016 |
| language | English |
| last_indexed | 2024-12-10T05:58:35Z |
| publishDate | 2020-09-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Materials |
| spelling | doaj.art-007d6045f6744ba19c33a3cffacba1512022-12-22T01:59:51ZengFrontiers Media S.A.Frontiers in Materials2296-80162020-09-01710.3389/fmats.2020.560621560621Numerical Simulation of Water Transport in Unsaturated Recycled Aggregate ConcreteZhaolin Liu0Zhaolin Liu1Peng Zhang2Jiuwen Bao3Yu Hu4Center for Durability & Sustainability Studies of Shandong Province, Qingdao University of Technology, Qingdao, ChinaState Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, ChinaCenter for Durability & Sustainability Studies of Shandong Province, Qingdao University of Technology, Qingdao, ChinaCenter for Durability & Sustainability Studies of Shandong Province, Qingdao University of Technology, Qingdao, ChinaState Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, ChinaThe old mortar attached to recycled aggregate (RA) is the main reason for the difference in water movement between RA concrete (RAC) and natural aggregate concrete. In this study, considering the old and new interfacial transition zones, a five-phase composite model for describing the water transport and distribution in RAC is established at the mesoscale. The key parameters describing water unsaturated transport in two types of mortar, saturated hydraulic conductivity (Ks) and van Genuchten model parameters (α, n), are obtained through the constant-head permeability test and isothermal adsorption test. By using the finite element method, the numerical simulations of unsaturated moisture movement in the homogeneous mortar, natural aggregate concrete, and five-phase RAC are systematically carried out. The proposed water transport model in the matrix is validated by comparison with the available experimental findings from the literature. The results show that the model can well predict unsaturated water transport in cement-based materials, including RAC. A parameter sensitivity analysis is undertaken to ascertain the main influencing factors of water transport in RAC. It is concluded that the RA replacement rate (Rra), the thickness of the old mortar (dm), and the aggregate volume fraction (Fa) are the primary parameters affecting moisture movement in RAC.https://www.frontiersin.org/article/10.3389/fmats.2020.560621/fullmesoscale modelrecycled aggregate concreteRichards’ equationinterfacial transition zonewater unsaturated transport |
| spellingShingle | Zhaolin Liu Zhaolin Liu Peng Zhang Jiuwen Bao Yu Hu Numerical Simulation of Water Transport in Unsaturated Recycled Aggregate Concrete Frontiers in Materials mesoscale model recycled aggregate concrete Richards’ equation interfacial transition zone water unsaturated transport |
| title | Numerical Simulation of Water Transport in Unsaturated Recycled Aggregate Concrete |
| title_full | Numerical Simulation of Water Transport in Unsaturated Recycled Aggregate Concrete |
| title_fullStr | Numerical Simulation of Water Transport in Unsaturated Recycled Aggregate Concrete |
| title_full_unstemmed | Numerical Simulation of Water Transport in Unsaturated Recycled Aggregate Concrete |
| title_short | Numerical Simulation of Water Transport in Unsaturated Recycled Aggregate Concrete |
| title_sort | numerical simulation of water transport in unsaturated recycled aggregate concrete |
| topic | mesoscale model recycled aggregate concrete Richards’ equation interfacial transition zone water unsaturated transport |
| url | https://www.frontiersin.org/article/10.3389/fmats.2020.560621/full |
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