Experimental investigation on the performance of flexural displacement recovery using crimped shape memory alloy fibers
- Authors
- Lee, J.-H.; Choi, E.; Jeon, J.-S.
- Issue Date
- 1-Nov-2021
- Publisher
- Elsevier Ltd
- Keywords
- Crack closure; Displacement recovery; Fiber-reinforced cementitious material; Flexural displacement; Shape memory alloy
- Citation
- Construction and Building Materials, v.306
- Journal Title
- Construction and Building Materials
- Volume
- 306
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/16250
- DOI
- 10.1016/j.conbuildmat.2021.124908
- ISSN
- 0950-0618
- Abstract
- Damage to a structure generally accompanies flexural deformation, which is mainly related to the safety of the structure. Displacement recovery should precede the repair and retrofitting of damaged concrete structures. In this study, a discrete shape memory alloy (SMA) wire was used to prepare a cementitious material with the capacity for flexural displacement recovery. The applicability of the SMA fiber-reinforced cementitious material is limited because of the geometry of the SMA wire. The proposed method for recovering the flexural displacement of concrete structures involves a new shape of the crimped SMA wire that increases the resistance between the wire and cementitious matrix. Cementitious slab specimens were designed according to the SMA content. A bending test was performed to determine the cracking and post-cracking flexural resistances. Heat was then applied to activate the shape memory effect of discontinuous SMA wire randomly mixed with cementitious materials. The results demonstrated that the crimped SMA fiber-reinforced cementitious slab with a content of 0.5–1.5% recovered the flexural displacement of the slab specimen, in addition to the closure of the crack. © 2021 Elsevier Ltd
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