• Proceedings of the Korean Institute of Building Construction Conference
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• 2017.05a
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• pp.250-251
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• 2017

In study, the lightweight insulation mortar is produced with more than 50,000tons of waste each year, but it is difficult to treat with the degradable composite material and the recycling ratio is still 50%. the lightweight insulation mortar is manufactured by using the ratio of expanded polystyrene and pulverized expanded polystyrene.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2016.05a
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• pp.221-222
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• 2016

The replacement ratio of waste EPS was varied, and its effect on compressive strength and absorption capacity was investigated. According to the experimental results, The 28th day compressive strengths for the W/C 50% specimens were 17.5~21.2MPa, which was relatively low compared to the 13.6~22.2MPa of the W/C 70%.

• Fire Science and Engineering
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• v.25 no.6
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• pp.8-13
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• 2011

High Strength Concrete (HSC) has a disadvantage of the brittle failure under fire due to the spalling. The studies on spalling control method of new constructed HSC buildings were performed enough, but the studies on existing buildings are insufficient. The new inorganic refractory mortar is developed in this study. The insulating capacity is enhanced by using light weight fine aggregate and polypropylene (PP) fiber. In results of material test, the thermal conductivity of light weight fine aggregate get lower than general fine aggregate. And in results of column test, the fire resisting time is delayed 20 minutes by using light weight fine aggregate, 10 minutes by increasing finishing depth from 10 mm to 20 mm and 4 minutes by using 0.6 % PP fiber.

• KIEAE Journal
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• v.10 no.3
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• pp.89-96
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• 2010

In comparison with ordinary or heavy-weight concrete, light-weight air void concrete has the good aspects in optimizing super tall structure systems for the process of design considering wind load and seismic load by lightening total dead load of buildings and reducing natural resources used. Light-weight air void concrete has excellent properties of heat and sound insulating due to its high amount porosity of air voids. So, it has been used as partition walls and the floor of Ondol which is the traditional Korean floor heating system. Under the condition of which the supply of light-weight aggregates are limited, the development of light-weight concrete using air voids is highly required in the aspects of reduced manufacturing prices and mass production. In this study, we investigated the physical properties and thermal behaviors of specimens that applied different mixing ratios of foaming agent to evaluate the possibility of use in the structural elements. We proposed the estimating equation for compressive strength of each mix having different ratio of foaming agent. We also confirmed that the density of cement matrix is decreased as the mixing amount of foaming agent increase up to 0.6% of foaming agent mixing ratio which was observed by SEM. Based on porosity and compressive strength of control mortar without foaming agent, we built the estimating equations of compressive strength for mortars with foaming agent. The upper limit of use in foaming agent is about 0.6% of the binder amount. Each air void is independent, and size of voids range from 50 to $100{\mu}m$.

• Journal of the Korea institute for structural maintenance and inspection
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• v.24 no.4
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• pp.81-90
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• 2020

A textile and capillary tube composite panel(TCP) was developed to simultaneously retrofit the seismic performance and the energy efficiency (e.g. heating or insulation performance) of existing unreinforced masonry (URM) buildings. TCP is a light-weight mortar panel in which carbon textile reinforcements and capillary tubes are embedded. Textile reinforcements plays a role of seismic retrofit and capillary tubes that hot water circulates contribute to the energy retrofit. In this paper, the static cyclic loading tests were performed on the masonry walls with/without TCP to understand the seismic retrofit effect of TCP retrofit and the results were summarized. The results of the test showed that the TCP contributed to increase the capacity of the Shear strength and ductility of the URM walls. In addition, the deformation of the wall after cracking was substantially controlled by the carbon textile.