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http://dx.doi.org/10.4334/JKCI.2017.29.2.131

Material Performance Evaluation of PolyUrea for Structural Seismic Retrofitting  

Cho, Chul-Min (School of Civil and Environmental Engineering, Yonsei University)
Choi, Ji-Hun (School of Civil and Environmental Engineering, Yonsei University)
Rhee, Seung-Hoon (ECO Industry)
Kim, Tae-Kyun (Hong-G Technical Research Institute)
Kim, Jang-Ho Jay (School of Civil and Environmental Engineering, Yonsei University)
Publication Information
Journal of the Korea Concrete Institute / v.29, no.2, 2017 , pp. 131-139 More about this Journal
Abstract
Recently, earthquakes have frequently occurred near Korean peninsula. An experimental study is needed for developing a reinforcing method for seismic strengthening to apply to RC structures. Recently, PolyUrea (PU) as structural reinforcement materials has been receiving great interest from construction industry. The reinforcing effect of PU appeared to be excellent under blast and impact as well as earthquakes. In this study, Flexible Type PolyUrea (FTPU) developed in preceding studies was modified to develop Stiff Type PolyUrea (STPU) by varying the ratio of the components of prepolymer and hardener of FTPU. The material performance evaluation has been performed through hardening time, tensile strength and percent elongation test, pull-off test, and shore hardness test. The experimental results showed that STPU has higher tensile strength and lower elongation than FTPU. Therefore, STPU coating agent can be used for semi-permanent products. By using STPU with Fiber-Reinforced Polymer (FRP) on concrete columns, confinement effect can be enhanced to maximize seismic strength and ductility.
Keywords
seismic; strengthen; reinforcement; PolyUrea; material performance evaluation;
Citations & Related Records
Times Cited By KSCI : 10  (Citation Analysis)
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