Fatigue Bond Behavior of Steel Rebars in Recycled Aggregate Concrete Containing Recycled Rubber
Recycled aggregate concrete (RAC) containing recycled rubber gains increasing attention for reinforced concrete structures, owing to its benefits in resource-saving and environmental protection. Bonding between rebars and concrete is critical to ensure the composite action in reinforced concrete mem...
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MDPI AG
2025-06-01
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| author | Wei Wei Shanming Cai Yufu Li |
| author_facet | Wei Wei Shanming Cai Yufu Li |
| author_sort | Wei Wei |
| collection | DOAJ |
| description | Recycled aggregate concrete (RAC) containing recycled rubber gains increasing attention for reinforced concrete structures, owing to its benefits in resource-saving and environmental protection. Bonding between rebars and concrete is critical to ensure the composite action in reinforced concrete members. Nevertheless, previous studies on such concrete mainly focused on material aspects. Bonding behavior for rubber RAC is not clear and needs further research. This study aims to clarify the effects of recycled aggregate and rubber on the monotonic and fatigue bond behavior of deformed steel rebar in concrete and to propose predictive models. Pullout tests under monotonic, fatigue, and post-fatigue monotonic loadings are conducted on a total of 21 monotonic and 30 fatigue specimens, including normal concrete, RAC, and rubber RAC. Four types of failure modes are identified for the tested specimens. Effects of the replacement rate of recycled aggregate, rubber, and load level on the fatigue behavior, such as fatigue life, slip-loading cycle curves, slip development, and residual bond strength, are investigated. With the addition of recycled aggregate and rubber, the monotonic bond strength is increased by 60%. Based on the experimental results, theoretical formulas are proposed to predict the monotonic bond strength, fatigue life, and the slip under fatigue loading. The predictive models are verified by the experimental results, for example, the average and COV of the predicted-to-experimental bond strength ratio are 1.0 and 0.11, which proves the reasonability of the proposed models. |
| format | Article |
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| language | English |
| publishDate | 2025-06-01 |
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| series | Buildings |
| spelling | doaj-art-d8f6ea28efb44c8db5dc45cffeb0d37a2025-06-25T13:36:10ZengMDPI AGBuildings2075-53092025-06-011512210210.3390/buildings15122102Fatigue Bond Behavior of Steel Rebars in Recycled Aggregate Concrete Containing Recycled RubberWei Wei0Shanming Cai1Yufu Li2Guangdong Construction Polytechnic, Guangzhou 510440, ChinaSchool of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, ChinaGuangdong Construction Polytechnic, Guangzhou 510440, ChinaRecycled aggregate concrete (RAC) containing recycled rubber gains increasing attention for reinforced concrete structures, owing to its benefits in resource-saving and environmental protection. Bonding between rebars and concrete is critical to ensure the composite action in reinforced concrete members. Nevertheless, previous studies on such concrete mainly focused on material aspects. Bonding behavior for rubber RAC is not clear and needs further research. This study aims to clarify the effects of recycled aggregate and rubber on the monotonic and fatigue bond behavior of deformed steel rebar in concrete and to propose predictive models. Pullout tests under monotonic, fatigue, and post-fatigue monotonic loadings are conducted on a total of 21 monotonic and 30 fatigue specimens, including normal concrete, RAC, and rubber RAC. Four types of failure modes are identified for the tested specimens. Effects of the replacement rate of recycled aggregate, rubber, and load level on the fatigue behavior, such as fatigue life, slip-loading cycle curves, slip development, and residual bond strength, are investigated. With the addition of recycled aggregate and rubber, the monotonic bond strength is increased by 60%. Based on the experimental results, theoretical formulas are proposed to predict the monotonic bond strength, fatigue life, and the slip under fatigue loading. The predictive models are verified by the experimental results, for example, the average and COV of the predicted-to-experimental bond strength ratio are 1.0 and 0.11, which proves the reasonability of the proposed models.https://www.mdpi.com/2075-5309/15/12/2102recycled aggregate concrete (RAC)recycled rubberpullout testbond strengthfatigue bond slipfatigue life |
| spellingShingle | Wei Wei Shanming Cai Yufu Li Fatigue Bond Behavior of Steel Rebars in Recycled Aggregate Concrete Containing Recycled Rubber Buildings recycled aggregate concrete (RAC) recycled rubber pullout test bond strength fatigue bond slip fatigue life |
| title | Fatigue Bond Behavior of Steel Rebars in Recycled Aggregate Concrete Containing Recycled Rubber |
| title_full | Fatigue Bond Behavior of Steel Rebars in Recycled Aggregate Concrete Containing Recycled Rubber |
| title_fullStr | Fatigue Bond Behavior of Steel Rebars in Recycled Aggregate Concrete Containing Recycled Rubber |
| title_full_unstemmed | Fatigue Bond Behavior of Steel Rebars in Recycled Aggregate Concrete Containing Recycled Rubber |
| title_short | Fatigue Bond Behavior of Steel Rebars in Recycled Aggregate Concrete Containing Recycled Rubber |
| title_sort | fatigue bond behavior of steel rebars in recycled aggregate concrete containing recycled rubber |
| topic | recycled aggregate concrete (RAC) recycled rubber pullout test bond strength fatigue bond slip fatigue life |
| url | https://www.mdpi.com/2075-5309/15/12/2102 |
| work_keys_str_mv | AT weiwei fatiguebondbehaviorofsteelrebarsinrecycledaggregateconcretecontainingrecycledrubber AT shanmingcai fatiguebondbehaviorofsteelrebarsinrecycledaggregateconcretecontainingrecycledrubber AT yufuli fatiguebondbehaviorofsteelrebarsinrecycledaggregateconcretecontainingrecycledrubber |