首页|The shear strength of the interface between artificial rock and printed concrete at super-early ages

The shear strength of the interface between artificial rock and printed concrete at super-early ages

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3D concrete printing has the potential to replace shotcrete for construction of linings of tunnels in hard rock.The shear strength of the interface between rock and printed concrete is vital,especially at super-early ages.However,traditional methods for testing the shear strength of the interface,e.g.,the direct shear test,are time-consuming and result in a high variability for fast-hardening printed concrete.In this paper,a new fast bond shear test is proposed.Each test can be completed in 1 min,with another 2 min for preparing the next test.The influence of the matrix composition,the age of the printed matrices,and the interface roughness of the artificial rock substrate on the shear strength of the interface was experimentally studied.The tests were conducted at the age of the matrices at the 1st,the 4th,the 8th,the 16th,the 32nd,and the 64th min after its final setting.A dimensionless formula was established to calculate the shear strength,accounting for the age of the printed matrices,the interface roughness,and the shear failure modes.It was validated by comparing the calculated results and the experimental results of one group of samples.

rock tunnelprinted concreteinterfacefast bond shear testshear strength

Yong Yuan、Xiaoyun Wang、Jiao-Long Zhang、Yaxin Tao、Kim Van Tittelboom、Luc Taerwe、Geert De Schutter

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College of Civil Engineering,Tongji University Shanghai 200092,China

State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China

Belgium-China Joint Laboratory for Industrialized Construction,Tongji University,Shanghai 200092,China

Magnel-Vandepitte Laboratory for Structural Engineering and Building Materials,Ghent University,Ghent 9052,Belgium

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Ministry of Science and Technology of ChinaFederal Ministry of Education,Science and Research(BMBWF)of AustriaIntense Upgrades of the New Austrian Tunnelling Method(NATM)Demonstration of its Applicability to High-Quality Urban Development上海市科委项目国家自然科学基金国家自然科学基金Shanghai Rising-Star ProgramJiangxi Province Department of Transportation Key Engineering Project国家留学基金委项目

2021YFE0114100CN11/202121DZ120350551908424U193421022QB14050002021C0008202006260198

2024

10.1007/s11709-024-1012-3

结构与土木工程前沿
高等教育出版社

结构与土木工程前沿

CSTPCDEI
影响因子：0.082
ISSN：2095-2430
年,卷(期)：2024.18(1)
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