Experimental investigation on the performance of flexural displacement recovery using crimped shape memory alloy fibers
- Authors
- Lee, Jong-Han; Choi, Eunsoo; Jeon, Jong-Su
- Issue Date
- 1-Nov-2021
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Flexural displacement; Displacement recovery; Crack closure; Shape memory alloy; Fiber-reinforced cementitious material
- Citation
- CONSTRUCTION AND BUILDING MATERIALS, v.306, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- CONSTRUCTION AND BUILDING MATERIALS
- Volume
- 306
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/140331
- 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.
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