键槽构造UHPC-NC界面黏结性能试验研究

doi:10.11896/cldb.20070033

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Abstract Ultra-high performance concrete (UHPC) is used to reinforce the bridge. The bonding performance between UHPC and the existing ordinary concrete (NC) structure interface is the key to ensuring the reinforcement effect. In order to study the influence of the interface structure on the bonding performance of the UHPC-NC interface, the keyway layout and shape are used as variables to carry out a single-sided direct shear test of the keyway structure UHPC-NC, and compare with the interface paste treatment specimen. The test results show that the failure modes of the UHPC-NC bonding interface can be mainly divided into four types, of which types c and d failure (the failure of the bonding interface and NC) accounts for 80% of the total failure modes; the interface bonding performance of the keyway structure group is better than the paste group, the shear strength of the interface bond is about 2 times higher than that of the paste group; when the width of the key notch is small (10—20 mm), that is, when the volume loss rate is less than 0.09, the shear strength of the UHPC-NC interface bond increases with the increase of the width of the key notch; the interface bonding shear strength of the normal trapezoidal keyway specimen is about 25% higher than that of the right angle keyway specimen, and the interface bonding shear strength of the inverted trapezoidal keyway specimen is 13%—15% higher than that of the right angle keyway specimen; the keyway structure UHPC-NC interface bond-slip curve includes an elastic rising phase, a yielding phase, and a failure falling phase. Some curves have no yielding phase, and their ultimate slip values are all below 0.8 mm. The keyway structure UHPC-NC interface bond-slip model is proposed, and the recommended value of bond stiffness is given.

Key words： bridge engineering ultra-high performance concrete bridge strengthening interface bonding behavior load sliding curve keyway structure

Published: Online: 2021-09-07

CLC number:

U444

Fund:Consulting Research Project of Chinese Academy of Engineering(2019-CQ-ZD-4), National Natural Science Foundation of China(51908093), Science Fund for Innovation Groups of Chongqing Natural Science Foundation(cstc2019jcyj-cxttX0004), Science and Technology Project of Guizhou Provincial Department of Transportation(2018-123-001).

About author: Jianting Zhou, doctor, postdoctoral, doctoral supervisor, National Outstanding Youth, Yangtze River Scho-lar, is now vice president of Chongqing Jiaotong University, director of the National Key Laboratory of Bridge and Tunnel Engineering in mountainous areas, director of the Chongqing Key Laboratory of Intelligent Perception and Control of Bridge Structures, and carries out scientific research around the direction of structural safety monitoring, evaluation and reinforcement. He presided over and mainly studied 20 national, provincial and ministerial level projects such as national science and technology research projects and National Natural Science Foundation projects, and 25 horizontal projects.
Jun Yang, doctor of engineering, master tutor, teacher of the School of Civil Engineering, Chongqing Jiaotong University, is currently a researcher of the State Key Laboratory of Bridge and Tunnel Engineering in the Mountainous Areas, and is mainly engaged in bridge engineering related teaching and research work, research direction including:strengthening old bridges and improving the performance of engineering structures;new bridge structures and ultra-high performance concrete (UHPC) materials. Published 14 papers, including 5 papers by the first author SCI/EI, presided over 1 project of the National Natural Science Foundation of China, 1 science and technology project of the Chongqing Municipal Education Commission, and 1 project of the Chongqing Science and Technology Association.

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	ZHOU Jianting
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Cite this article:

ZHOU Jianting,HU Tianxiang,YANG Jun, et al. Experimental Investigation on Bonding Behavior of UHPC-NC Interface in Keyway Structure[J]. Materials Reports, 2021, 35(16): 16050-16057.

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http://www.mater-rep.com/EN/10.11896/cldb.20070033 OR http://www.mater-rep.com/EN/Y2021/V35/I16/16050

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