EXPERIMENTAL RESEARCH ON BONDING PROPERTIES OF SHAPE-MEMORY ALLOY FIBERS IN HIGH DUCTILITY CEMENT-BASED COMPOSITES

YANG Zhao; DOU Nan; DONG Hao

doi:10.13204/j.gyjzG21022004

Volume 51 Issue 9

Jan. 2022

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Liu Hua, . TECHNICAL COMPARISON AND ECONOMIC ANALYSIS OF BUILDING STRENGTHENING[J]. INDUSTRIAL CONSTRUCTION, 2007, 37(4): 88-90. doi: 10.13204/j.gyjz200704024

Citation:

YANG Zhao, DOU Nan, DONG Hao. EXPERIMENTAL RESEARCH ON BONDING PROPERTIES OF SHAPE-MEMORY ALLOY FIBERS IN HIGH DUCTILITY CEMENT-BASED COMPOSITES[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(9): 188-196. doi: 10.13204/j.gyjzG21022004

Liu Hua, . TECHNICAL COMPARISON AND ECONOMIC ANALYSIS OF BUILDING STRENGTHENING[J]. INDUSTRIAL CONSTRUCTION, 2007, 37(4): 88-90. doi: 10.13204/j.gyjz200704024

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EXPERIMENTAL RESEARCH ON BONDING PROPERTIES OF SHAPE-MEMORY ALLOY FIBERS IN HIGH DUCTILITY CEMENT-BASED COMPOSITES

doi: 10.13204/j.gyjzG21022004

Institute of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China

Received Date: 2021-02-20
Available Online: 2022-01-11

Abstract

Abstract

The cooperative work of high ductility cement-based composites and hyperelastic shape-memory alloy (SMA) can improve the energy-dissipation capacity and self-repair capacity of structure. The use of shape-memory alloy fiber can effectively solve some problems of shape-memory alloy bars or cables, so it has a broader application prospect. Several groups of test specimens were fabricated by embedding superelastic shape-memory alloy fibers with different diameters and end shapes into high-ductility cement-based materials with up to 3% tensile strain, some of which had different embedded depths. The pull-out tests of specimens were conducted by displacement-controlled loading, the stress-strain curves of pull-out for specimens were obtained, and the effects of various factors on the bonding properties between shape-memory alloy fiber and high-ductility cement-based composites were analyzed. The results showed that the knotted end could greatly improve the bond strength of shape-memory alloy fibers in the high-ductility cement matrix and provide sufficient anchoring forces for shape-memory alloy fibers to exert its superelasticity. The maximum tensile stress of all types of knotted specimens was above 900 MPa, and the maximum could reach 1 142.52 MPa. Among them, the specimen with knotted SMAF with diameter of 1.2 mm and embedded depth of 40 mm had better mechanical properties and fiber utilization ratios.
- shape memory alloy fiber,
- high-ductility cement-based composite,
- bonding property,
- superelasticity

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References

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