Study on the Strength Performance of Recycled Aggregate Concrete with Different Ages under Direct Shearing
In order to study the mechanical properties of recycled aggregate concrete (RAC) at different ages, 264 standard cubes were designed to test its direct shear strength and cube compressive strength while considering the parameters of age and recycled aggregate replacement ratio. The failure pattern a...
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MDPI AG
2021-04-01
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| author | Xin Liang Fang Yan Yuliang Chen Huiqin Wu Peihuan Ye Yuhuan Mo |
| author_facet | Xin Liang Fang Yan Yuliang Chen Huiqin Wu Peihuan Ye Yuhuan Mo |
| author_sort | Xin Liang |
| collection | DOAJ |
| description | In order to study the mechanical properties of recycled aggregate concrete (RAC) at different ages, 264 standard cubes were designed to test its direct shear strength and cube compressive strength while considering the parameters of age and recycled aggregate replacement ratio. The failure pattern and load–displacement curve of specimens at direct shearing were obtained; the direct shear strength and residual shear strength were extracted from the load–displacement curves. Experimental results indicate that the influence of the replacement ratio for the front and side cracks of RAC is insignificant, with the former being straight and the latter relatively convoluted. At the age of three days, the damaged interface between aggregate and mortar is almost completely responsible for concrete failure; in addition to the damage of coarse aggregates, aggregate failure is also an important factor in concrete failure at other ages. The load–displacement curve of RAC at direct shearing can be divided into elasticity, elastoplasticity, plasticity, and stabilization stages. The brittleness of concrete decreases with its age, which is reflected in the gradual shortening of the elastoplastic stage. At 28 days of age, the peak direct shear force increases with the replacement ratio, while the trend is opposite at ages of 3 days, 7 days, and 14 days, respectively. The residual strength of RAC decreases inversely to the replacement ratio, with the rate of decline growing over time. A two-parameter RAC direct shear strength calculation formula was established based on the analysis of age and replacement rate to peak shear force of RAC. The relationship between cube compressive strength and direct shear strength of recycled concrete at various ages was investigated. |
| first_indexed | 2024-03-09T04:56:34Z |
| format | Article |
| id | doaj.art-cbee44e7ae9241199210c7506c55dced |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T04:56:34Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-cbee44e7ae9241199210c7506c55dced2023-12-03T13:04:51ZengMDPI AGMaterials1996-19442021-04-01149231210.3390/ma14092312Study on the Strength Performance of Recycled Aggregate Concrete with Different Ages under Direct ShearingXin Liang0Fang Yan1Yuliang Chen2Huiqin Wu3Peihuan Ye4Yuhuan Mo5Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611731, ChinaSchool of Civil and Architectural Engineering, Guangxi University of Science and Technology, Liuzhou 545006, ChinaSchool of Civil and Architectural Engineering, Guangxi University of Science and Technology, Liuzhou 545006, ChinaSchool of Civil and Architectural Engineering, Guangxi University of Science and Technology, Liuzhou 545006, ChinaSchool of Civil and Architectural Engineering, Guangxi University of Science and Technology, Liuzhou 545006, ChinaSchool of Civil and Architectural Engineering, Guangxi University of Science and Technology, Liuzhou 545006, ChinaIn order to study the mechanical properties of recycled aggregate concrete (RAC) at different ages, 264 standard cubes were designed to test its direct shear strength and cube compressive strength while considering the parameters of age and recycled aggregate replacement ratio. The failure pattern and load–displacement curve of specimens at direct shearing were obtained; the direct shear strength and residual shear strength were extracted from the load–displacement curves. Experimental results indicate that the influence of the replacement ratio for the front and side cracks of RAC is insignificant, with the former being straight and the latter relatively convoluted. At the age of three days, the damaged interface between aggregate and mortar is almost completely responsible for concrete failure; in addition to the damage of coarse aggregates, aggregate failure is also an important factor in concrete failure at other ages. The load–displacement curve of RAC at direct shearing can be divided into elasticity, elastoplasticity, plasticity, and stabilization stages. The brittleness of concrete decreases with its age, which is reflected in the gradual shortening of the elastoplastic stage. At 28 days of age, the peak direct shear force increases with the replacement ratio, while the trend is opposite at ages of 3 days, 7 days, and 14 days, respectively. The residual strength of RAC decreases inversely to the replacement ratio, with the rate of decline growing over time. A two-parameter RAC direct shear strength calculation formula was established based on the analysis of age and replacement rate to peak shear force of RAC. The relationship between cube compressive strength and direct shear strength of recycled concrete at various ages was investigated.https://www.mdpi.com/1996-1944/14/9/2312recycled coarse concretedirect shear testearly agedirect shear strengthresidual strength |
| spellingShingle | Xin Liang Fang Yan Yuliang Chen Huiqin Wu Peihuan Ye Yuhuan Mo Study on the Strength Performance of Recycled Aggregate Concrete with Different Ages under Direct Shearing Materials recycled coarse concrete direct shear test early age direct shear strength residual strength |
| title | Study on the Strength Performance of Recycled Aggregate Concrete with Different Ages under Direct Shearing |
| title_full | Study on the Strength Performance of Recycled Aggregate Concrete with Different Ages under Direct Shearing |
| title_fullStr | Study on the Strength Performance of Recycled Aggregate Concrete with Different Ages under Direct Shearing |
| title_full_unstemmed | Study on the Strength Performance of Recycled Aggregate Concrete with Different Ages under Direct Shearing |
| title_short | Study on the Strength Performance of Recycled Aggregate Concrete with Different Ages under Direct Shearing |
| title_sort | study on the strength performance of recycled aggregate concrete with different ages under direct shearing |
| topic | recycled coarse concrete direct shear test early age direct shear strength residual strength |
| url | https://www.mdpi.com/1996-1944/14/9/2312 |
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