Out-of-plane strengthening of unreinforced masonry walls using textile reinforced mortar added short polyvinyl alcohol fibers. (10th November 2020)

• Record Type: Journal Article
• Authors: Dong, Zhifang; Deng, Mingke; Zhang, Yangxi; Zhang, Cong; Ma, Ping
• Is Part Of: Construction & building materials. Volume 260(2020)
• Publication Date: 2020-11-10
• Subjects: Textile reinforced mortar (TRM) -- Unreinforced masonry (URM) -- Short PVA fibers -- Out-of-plane strengthening -- Tensile strength -- Bearing capacity; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2020.119910
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: This paper presented the uniaxial tensile behavior of TRM with short PVA fibers. The URM walls strengthened with the TRM were tested to research the out-of-plane behaviors. The composite can significantly improve the bearing capacity and deformation of URM walls. An analytical model related the failure mode of specimens is proposed to predict the capacity. Abstract: Textile reinforced mortar (TRM) is a promising composite that exhibites typical multiple cracking behaviors. Short polyvinyl alcohol (PVA) fibers were added to a TRM matrix to increase its tensile strength and toughness and prevent the external matrix from detaching from the composite overlay in the experiments. Six groups of uniaxial tensile specimens were fabricated to investigate the tensile behaviors of the improved TRM composite. A group of unreinforced masonry (URM) walls and five groups of URM walls strengthened with the optimized composite were tested to study the out-of-plane behaviors. The results indicate that the ultimate strength of the composite significantly increased with the reinforcing ratio of carbon textiles. Detachment of the external matrix was not observed during all the tests. The deformation ability, bearing capacity and energy dissipation capacity of the strengthened specimens improved significantly. Finally, analytical models related to the failure modes of strengthened walls were proposed to predict the bearing capacity of strengthened walls.