Experimental of interface shear behavior between selfcompactingconcrete and carbonation concrete(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年02期
- Page:
- 65-72
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Experimental of interface shear behavior between selfcompactingconcrete and carbonation concrete
- Author(s):
- LUO Yuming1; 2; ZHANG Jianren1; ZHANG Xuhui1; 3; PENG Jianxin
- 1. School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China；2. School of Road and Bridge Engineering, Hunan Communication Polytechnic, Changsha 410132, Hunan, China;〖JP〗3. College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, Hunan, China
- Keywords:
- bridge engineering; selfcompacting concrete; direct shear test; concrete carbonation; shear behavior
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to investigate the effects of carbonation on the interface shear behavior between selfcompacting concrete and carbonation concrete, when the concrete structures exposed to air for a long period of time will become carbonized， and help determine the reinforcement applied to carbonized concrete structures. A series of Ztype specimens with different carbonation depths were designed and tested under a direct shear force. The influence of the concrete carbonation depth, concrete strength, and interfacial treatment modes on the failure mode and ultimate shear strength of the tested specimens were clarified. Further, an analytical model was developed to predict the shear strength between the selfcompacting concrete and the carbonation concrete based on the experimental. The results show that concrete carbonation leads to the change of shear crack distribution at bond interface. A local reinforced region is formed within the interface owing to the increase in the ultimate strength and elastic modulus of concrete caused by carbonization. The shear crack gradually transfers from the original interface crack to the old concrete, and extends to the interface between the carbonization strengthening area and the noncarbonization area. The carbonation also leads to an increase in the shear strength. The increase in shear strength within the interface occurs extremely quickly for the specimens during the early stage of carbonization，and then shows a slightly increase as the carbonation depth exceeds a critical value. The shear strength within the interface is also affected by the concrete strength and the interfacial treatment modes etc. For specimens with typeⅠ and typeⅡ interface modes, the increase in new concrete strength within a certain range can effectively improve the shear strength. The further increase in the new concrete strength has little influence on the increase in shear strength as it exceeds a critical value. Moreover, the typeⅢ interface mode with a plated reinforcement bar significantly increases the shear strength, and it is dependent on the concrete with an ultimate low strength. 3 tabs, 9 figs, 23 refs.
Last Update: 2019-04-01