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A platform for research: civil engineering, architecture and urbanism
Push-off test on concrete-concrete interface with different types of concrete after elevated temperatures
https://orcid.org/0000-0003-1287-1199
Highlights Concrete-concrete interface with RAC, NAC, HSC was tested after high temperature. RAC interface is not worse than NAC interface after elevated temperature. HSC interface deteriorates more serious after 400℃ than NAC interface. A preliminary shear strength degradation equations for concrete-concrete interface are fitted.
Abstract In this study, the post-fire shear strength of concrete-concrete interfaces after exposed to 20, 200, 400, and 600 °C was experimentally studied using Z-shape push-off tests. The influences of recycled aggregate concrete (RAC), high strength concrete (HSC), interface roughness, and cement mortar surface bonding agent were analyzed intensively. The test results indicated that the interfacial shear strength decreased significantly after exposed to elevated temperatures. The shear strength of the smooth interface decreased more rapidly than that of the rough interface. Under the condition of similar compressive strength, the interfacial shear strength of the specimen with RAC was not lower than that with natural aggregate concrete (NAC) and even demonstrated better fire performance. The employment of HSC contributes to the higher interfacial shear strength, but the deterioration is obvious after exposed to elevated temperatures. Based on the test results and variance analysis, this study also proposed preliminary interfacial shear strength degradation equations of the concrete-concrete interface after exposed to elevated temperatures, aiming to provide a reference for further numerical fire analysis.
Push-off test on concrete-concrete interface with different types of concrete after elevated temperatures
https://orcid.org/0000-0003-1287-1199
Highlights Concrete-concrete interface with RAC, NAC, HSC was tested after high temperature. RAC interface is not worse than NAC interface after elevated temperature. HSC interface deteriorates more serious after 400℃ than NAC interface. A preliminary shear strength degradation equations for concrete-concrete interface are fitted.
Abstract In this study, the post-fire shear strength of concrete-concrete interfaces after exposed to 20, 200, 400, and 600 °C was experimentally studied using Z-shape push-off tests. The influences of recycled aggregate concrete (RAC), high strength concrete (HSC), interface roughness, and cement mortar surface bonding agent were analyzed intensively. The test results indicated that the interfacial shear strength decreased significantly after exposed to elevated temperatures. The shear strength of the smooth interface decreased more rapidly than that of the rough interface. Under the condition of similar compressive strength, the interfacial shear strength of the specimen with RAC was not lower than that with natural aggregate concrete (NAC) and even demonstrated better fire performance. The employment of HSC contributes to the higher interfacial shear strength, but the deterioration is obvious after exposed to elevated temperatures. Based on the test results and variance analysis, this study also proposed preliminary interfacial shear strength degradation equations of the concrete-concrete interface after exposed to elevated temperatures, aiming to provide a reference for further numerical fire analysis.
Push-off test on concrete-concrete interface with different types of concrete after elevated temperatures
https://orcid.org/0000-0003-1287-1199
Highlights Concrete-concrete interface with RAC, NAC, HSC was tested after high temperature. RAC interface is not worse than NAC interface after elevated temperature. HSC interface deteriorates more serious after 400℃ than NAC interface. A preliminary shear strength degradation equations for concrete-concrete interface are fitted.
Abstract In this study, the post-fire shear strength of concrete-concrete interfaces after exposed to 20, 200, 400, and 600 °C was experimentally studied using Z-shape push-off tests. The influences of recycled aggregate concrete (RAC), high strength concrete (HSC), interface roughness, and cement mortar surface bonding agent were analyzed intensively. The test results indicated that the interfacial shear strength decreased significantly after exposed to elevated temperatures. The shear strength of the smooth interface decreased more rapidly than that of the rough interface. Under the condition of similar compressive strength, the interfacial shear strength of the specimen with RAC was not lower than that with natural aggregate concrete (NAC) and even demonstrated better fire performance. The employment of HSC contributes to the higher interfacial shear strength, but the deterioration is obvious after exposed to elevated temperatures. Based on the test results and variance analysis, this study also proposed preliminary interfacial shear strength degradation equations of the concrete-concrete interface after exposed to elevated temperatures, aiming to provide a reference for further numerical fire analysis.
Push-off test on concrete-concrete interface with different types of concrete after elevated temperatures
Chen, Zixuan (author) / Xiao, Jianzhuang (author) / Ding, Tao (author) / Liu, Baojia (author)
2023-03-20
Article (Journal)
Electronic Resource
English
Residual performance of concrete–adhesive interface at elevated temperatures
| British Library Online Contents | 2016
Residual performance of concrete–adhesive interface at elevated temperatures
| Online Contents | 2016