Influence of Old Concrete Age, Interface Roughness and Freeze-Thawing Attack on New-to-Old Concrete Structure
The bonding surface structure generated by the repair of concrete structures has been paid more attention as a weak point. The effects of old concrete age, interface roughness, and freeze-thawing (F-T) attack on adhesive interface are comprehensively investigated. In this study, six kinds of interfa...
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MDPI AG
2021-02-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/5/1057 |
| _version_ | 1797395352143265792 |
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| author | Jingchong Fan Lili Wu Bo Zhang |
| author_facet | Jingchong Fan Lili Wu Bo Zhang |
| author_sort | Jingchong Fan |
| collection | DOAJ |
| description | The bonding surface structure generated by the repair of concrete structures has been paid more attention as a weak point. The effects of old concrete age, interface roughness, and freeze-thawing (F-T) attack on adhesive interface are comprehensively investigated. In this study, six kinds of interface roughness and five different old concrete age are designed. The interfacial bonding property is mainly evaluated by splitting tensile strength (<i>f</i><sub>ts</sub>). Fractal analysis was used to characterize the interface roughness using laser scanning data. In general, the <i>f</i><sub>ts</sub> increased with the increasing value of interface fractal dimension. The relationship between <i>f</i><sub>ts</sub> and fractal dimension value was further analyzed, considering the old concrete ages and the F-T cycles. The results show that the effect of roughness on the bonding property of new-to-old concrete is more significant than the age of old concrete, and the influence of the F-T cycles on the bonding surface is mainly reflected in the initial stage of the F-T deterioration process. The relative dynamic elasticity modulus decreased obviously under F-T cycles, especially for the specimens with low interface roughness. In combination with the results of two non-destructive methods (ultrasonic non-destructive test and relative dynamic elastic modulus test), the larger roughness and the smaller age of old concrete can improve the bond performance. |
| first_indexed | 2024-03-09T00:34:19Z |
| format | Article |
| id | doaj.art-29e80f16bcf94dc2a2dbb2631585a4a0 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T00:34:19Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-29e80f16bcf94dc2a2dbb2631585a4a02023-12-11T18:16:39ZengMDPI AGMaterials1996-19442021-02-01145105710.3390/ma14051057Influence of Old Concrete Age, Interface Roughness and Freeze-Thawing Attack on New-to-Old Concrete StructureJingchong Fan0Lili Wu1Bo Zhang2School of Mechanics & Civil Engineering, China University of Mining and Technology, Beijing 100083, ChinaSchool of Mechanics & Civil Engineering, China University of Mining and Technology, Beijing 100083, ChinaState Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, ChinaThe bonding surface structure generated by the repair of concrete structures has been paid more attention as a weak point. The effects of old concrete age, interface roughness, and freeze-thawing (F-T) attack on adhesive interface are comprehensively investigated. In this study, six kinds of interface roughness and five different old concrete age are designed. The interfacial bonding property is mainly evaluated by splitting tensile strength (<i>f</i><sub>ts</sub>). Fractal analysis was used to characterize the interface roughness using laser scanning data. In general, the <i>f</i><sub>ts</sub> increased with the increasing value of interface fractal dimension. The relationship between <i>f</i><sub>ts</sub> and fractal dimension value was further analyzed, considering the old concrete ages and the F-T cycles. The results show that the effect of roughness on the bonding property of new-to-old concrete is more significant than the age of old concrete, and the influence of the F-T cycles on the bonding surface is mainly reflected in the initial stage of the F-T deterioration process. The relative dynamic elasticity modulus decreased obviously under F-T cycles, especially for the specimens with low interface roughness. In combination with the results of two non-destructive methods (ultrasonic non-destructive test and relative dynamic elastic modulus test), the larger roughness and the smaller age of old concrete can improve the bond performance.https://www.mdpi.com/1996-1944/14/5/1057new-to-old concreteinterface roughnesssplitting tensile strengthfreeze-thawfractal dimension |
| spellingShingle | Jingchong Fan Lili Wu Bo Zhang Influence of Old Concrete Age, Interface Roughness and Freeze-Thawing Attack on New-to-Old Concrete Structure Materials new-to-old concrete interface roughness splitting tensile strength freeze-thaw fractal dimension |
| title | Influence of Old Concrete Age, Interface Roughness and Freeze-Thawing Attack on New-to-Old Concrete Structure |
| title_full | Influence of Old Concrete Age, Interface Roughness and Freeze-Thawing Attack on New-to-Old Concrete Structure |
| title_fullStr | Influence of Old Concrete Age, Interface Roughness and Freeze-Thawing Attack on New-to-Old Concrete Structure |
| title_full_unstemmed | Influence of Old Concrete Age, Interface Roughness and Freeze-Thawing Attack on New-to-Old Concrete Structure |
| title_short | Influence of Old Concrete Age, Interface Roughness and Freeze-Thawing Attack on New-to-Old Concrete Structure |
| title_sort | influence of old concrete age interface roughness and freeze thawing attack on new to old concrete structure |
| topic | new-to-old concrete interface roughness splitting tensile strength freeze-thaw fractal dimension |
| url | https://www.mdpi.com/1996-1944/14/5/1057 |
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