期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 223, 期 -, 页码 12-27出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.06.188
关键词
Engineered cementitious composites (ECC); Interface; Shear strength; Interface bond; Shear strength model; Shear stress-slip model
资金
- Science Foundation of China [51808562, 51878156, 51578135]
- Program of National Natural Science of China [51739008, 51527811]
- Open Fund of Key Laboratory of Transport Industry of Bridge Detection Reinforcement Technology (Chang'an University) [300102219527, 300102219528]
- Start-up Funds of DGUT [GC300502-29, GC300502-32]
- Higher Education Research Project of DGUT [2018GJYB04, 2017GJYB06]
- Guangdong Natural Science Foundation [2018A030313864]
- [51809046]
This paper reveals an investigation of the influences of ECC mixture construction method (i.e., common casting and spraying ECC), ECC strength grade, interface roughness of concrete substrate, and polyvinyl alcohol (PVA) fiber type on shear properties of ECC-to-concrete interface. The test results show that two failure modes of interface shear failure and ECC failure were observed. The roughness degree of concrete substrate had a strong effect on the failure mode, while ECC strength grade, ECC mixture construction method, and PVA fiber type had almost no influence on the failure mode. The shear load-slip curves of all specimens were basically similar. Compared to the casting ECC, the spraying ECC had an obvious decreasing effect on interface shear strength. The ECC strength grade and roughness degree of concrete substrate had a significant influence on interface shear strength, and higher ECC compressive strength and coarser interface could cause higher interface shear strength. On the contrary, PVA fiber type had a slight influence on interface shear strength. Based on the micro-bonding mechanism and test results of shear load-slip curves, a shear strength mechanical model and a shear stress-slip model of ECC-to-concrete interface were proposed to predict interface shear strength and shear stress-slip curve, respectively. (C) 2019 Published by Elsevier Ltd.
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