• Magazine of korean Tunnelling and Underground Space Association
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• v.3 no.1
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• pp.46-54
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• 2001

• Magazine of korean Tunnelling and Underground Space Association
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• v.9 no.3
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• pp.6-31
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• 2007

• Journal of the Korea Construction Safety Engineering Association
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• s.31
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• pp.60-72
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• 2005

• Journal of the Korean Society for Railway
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• v.8 no.1
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• pp.25-32
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• 2005

• Magazine of korean Tunnelling and Underground Space Association
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• v.1 no.2
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• pp.72-80
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• 1999

• Magazine of korean Tunnelling and Underground Space Association
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• v.1 no.1
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• pp.59-66
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• 1999

• Magazine of korean Tunnelling and Underground Space Association
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• v.9 no.4
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• pp.8-32
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• 2007

• Magazine of korean Tunnelling and Underground Space Association
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• v.2 no.3
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• pp.100-110
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• 2000

• Journal of the Korean Recycled Construction Resources Institute
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• v.12 no.2
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• pp.111-120
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• 2024

This paper presents a study aimed at developing repair materials for emergency slope stabilization after disasters such as floods. The research assessed how different mix ratios of fly ash and reinforcement with basalt fibers affect the basic quality properties of mortars. Optimal amounts of fly ash were selected based on these properties, and appropriate amounts of chemical admixtures and thickeners were determined to enhance the quality attributed to the basalt fiber mixture. Notably, high-volume fly ash reduced the need for high-performance water reducers and improved workability, known benefits that also helped mitigate fiber ball issues in conjunction with the effects of thickeners. The experimental results indicated that the developed repair materials could potentially be used for emergency repairs, with a focus on initial age strength. This research aims to provide foundational data for repair materials used in future emergency slope stabilizations.

• Journal of the Korea Concrete Institute
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• v.29 no.2
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• pp.131-139
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• 2017

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.