Comprehensive Evaluation of the Sustainability of Waste Concrete towards Structural Concrete Application in Freeze-Thaw Environment
To promote the in-situ and structural application of waste concrete in cold regions, the sustainable application potential of waste concrete in a freeze-thaw (F-T) environment was comprehensively evaluated from three aspects of performance, environmental load, and economic benefit. The recycled aggr...
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MDPI AG
2022-09-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/17/6153 |
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| author | Da Wei Pinghua Zhu Shan Gao Xiancui Yan Hui Liu Haifeng Fan |
| author_facet | Da Wei Pinghua Zhu Shan Gao Xiancui Yan Hui Liu Haifeng Fan |
| author_sort | Da Wei |
| collection | DOAJ |
| description | To promote the in-situ and structural application of waste concrete in cold regions, the sustainable application potential of waste concrete in a freeze-thaw (F-T) environment was comprehensively evaluated from three aspects of performance, environmental load, and economic benefit. The recycled aggregate concrete (RAC) was produced by recycled coarse aggregate (RCA), which was obtained from the crushing of natural aggregate concrete (NAC) after every F-T 150 cycles until F-T failure. The effects of F-T damage of parent concrete on the physical properties of RCA and mechanical and frost resistance of RAC under 35% flexural stress were studied. Besides, the sustainability of NAC and RAC was compared and analyzed by emergy theory. The results suggested that the physical properties of RCA deteriorated gradually with the accumulation of F-T damage to parent concrete. The RCA obtained from parent concrete that suffered F-T damage could be used as coarse aggregate for structural concrete when F-T damage is smaller than 0.367. The F-T damage of parent concrete had an adverse effect on the mechanical properties and frost resistance of RAC. The frost resistance of RAC obtained from parent concrete with larger F-T damage was worse. The RAC prepared from parent concrete without F-T failure can serve 50 years in cold regions, while that with F-T failure can only serve 30 years. The F-T damage microelements were dispersed in the adhesive mortar of RCA and transferred to RAC, resulting in the reduction of the mechanical properties and frost resistance of RAC. Emergy analysis showed that the reuse of waste concrete after F-T failure required higher economic input, higher environment load, lower output efficiency, and sustainability. The performance, environmental load and economic benefit of RAC prepared by using waste concrete after F-T failure were inferior to that of waste concrete without F-T failure. Waste concrete after F-T failure is not recommended to be used as coarse aggregate for structural concrete. |
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| id | doaj.art-acc1ee9e0543432a8f5632f94f295875 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T01:33:48Z |
| publishDate | 2022-09-01 |
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| series | Materials |
| spelling | doaj.art-acc1ee9e0543432a8f5632f94f2958752023-11-23T13:36:30ZengMDPI AGMaterials1996-19442022-09-011517615310.3390/ma15176153Comprehensive Evaluation of the Sustainability of Waste Concrete towards Structural Concrete Application in Freeze-Thaw EnvironmentDa Wei0Pinghua Zhu1Shan Gao2Xiancui Yan3Hui Liu4Haifeng Fan5Department of Civil Engineering, Changzhou University, 21 Gehu Middle Road, Wujin District, Changzhou 213164, ChinaDepartment of Civil Engineering, Changzhou University, 21 Gehu Middle Road, Wujin District, Changzhou 213164, ChinaSchool of Civil Engineering, Harbin Institute of Technology, Harbin 150090, ChinaDepartment of Civil Engineering, Changzhou University, 21 Gehu Middle Road, Wujin District, Changzhou 213164, ChinaDepartment of Civil Engineering, Changzhou University, 21 Gehu Middle Road, Wujin District, Changzhou 213164, ChinaDepartment of Civil Engineering, Changzhou University, 21 Gehu Middle Road, Wujin District, Changzhou 213164, ChinaTo promote the in-situ and structural application of waste concrete in cold regions, the sustainable application potential of waste concrete in a freeze-thaw (F-T) environment was comprehensively evaluated from three aspects of performance, environmental load, and economic benefit. The recycled aggregate concrete (RAC) was produced by recycled coarse aggregate (RCA), which was obtained from the crushing of natural aggregate concrete (NAC) after every F-T 150 cycles until F-T failure. The effects of F-T damage of parent concrete on the physical properties of RCA and mechanical and frost resistance of RAC under 35% flexural stress were studied. Besides, the sustainability of NAC and RAC was compared and analyzed by emergy theory. The results suggested that the physical properties of RCA deteriorated gradually with the accumulation of F-T damage to parent concrete. The RCA obtained from parent concrete that suffered F-T damage could be used as coarse aggregate for structural concrete when F-T damage is smaller than 0.367. The F-T damage of parent concrete had an adverse effect on the mechanical properties and frost resistance of RAC. The frost resistance of RAC obtained from parent concrete with larger F-T damage was worse. The RAC prepared from parent concrete without F-T failure can serve 50 years in cold regions, while that with F-T failure can only serve 30 years. The F-T damage microelements were dispersed in the adhesive mortar of RCA and transferred to RAC, resulting in the reduction of the mechanical properties and frost resistance of RAC. Emergy analysis showed that the reuse of waste concrete after F-T failure required higher economic input, higher environment load, lower output efficiency, and sustainability. The performance, environmental load and economic benefit of RAC prepared by using waste concrete after F-T failure were inferior to that of waste concrete without F-T failure. Waste concrete after F-T failure is not recommended to be used as coarse aggregate for structural concrete.https://www.mdpi.com/1996-1944/15/17/6153freeze-thaw damageparent concretestructural concreterecycled aggregate concreteperformancesustainability |
| spellingShingle | Da Wei Pinghua Zhu Shan Gao Xiancui Yan Hui Liu Haifeng Fan Comprehensive Evaluation of the Sustainability of Waste Concrete towards Structural Concrete Application in Freeze-Thaw Environment Materials freeze-thaw damage parent concrete structural concrete recycled aggregate concrete performance sustainability |
| title | Comprehensive Evaluation of the Sustainability of Waste Concrete towards Structural Concrete Application in Freeze-Thaw Environment |
| title_full | Comprehensive Evaluation of the Sustainability of Waste Concrete towards Structural Concrete Application in Freeze-Thaw Environment |
| title_fullStr | Comprehensive Evaluation of the Sustainability of Waste Concrete towards Structural Concrete Application in Freeze-Thaw Environment |
| title_full_unstemmed | Comprehensive Evaluation of the Sustainability of Waste Concrete towards Structural Concrete Application in Freeze-Thaw Environment |
| title_short | Comprehensive Evaluation of the Sustainability of Waste Concrete towards Structural Concrete Application in Freeze-Thaw Environment |
| title_sort | comprehensive evaluation of the sustainability of waste concrete towards structural concrete application in freeze thaw environment |
| topic | freeze-thaw damage parent concrete structural concrete recycled aggregate concrete performance sustainability |
| url | https://www.mdpi.com/1996-1944/15/17/6153 |
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