• Proceedings of the Korea Concrete Institute Conference
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• 2010.05a
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• pp.197-198
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• 2010

The purpose of this study is to compare chloride attack resistibility of light weight aggregate concrete to chloride attack resistibility of normal concrete and confirm the utility. As a result, light weight aggregate concrete's chloride attack resistibility is lower than normal concrete's chloride attack resistibility.

• Journal of the Korea Institute of Building Construction
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• v.15 no.2
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• pp.201-207
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• 2015

In this paper, a series of experiments was conducted to evaluate the resistibility of carbonation and freeze-thawing damage of the high-volume blast furnace slag concrete using expancel, the expandable microsphere, and ERCO, emulsified refine cooking oil. The concrete mixture of 0.45 water-to-binder ratio with 60% of blast furnace slag was evaluated for carbonation, freeze-thawing resistibility, SEM, and porosity. According to the previous research, replacing ERCO contributes on improving carbonation resistibility with capillary pore filling effect by soap foaming reaction of ERCO while significantly decreased freeze-thawing resistibility. To improve this decreased freeze-thawing resistibility, expancel was used, and thus freeze-thawing resistibility was improved as the replacement ratio of expancel was increased. It is considered that the selective volume shrunken effect of expancel due to the external pressure and decreased air void spacing factor due to expancel.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.11a
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• pp.52-53
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• 2018

As a result of exposing the concrete at 1 and 6 atm in order to evaluate the salt resistance of the pressurized marine concrete, the pressure resulted in promoting the chloride ion penetration of the concrete. Particularly, the amount of water soluble chloride in the surface area tends to increase rapidly, and this cause is considered to be highly correlated with the size of the capillary pores of the concrete. On the other hand, the blending of blast furnace slag was effective to increse chloride attack resistibility even under the pressure.

• Journal of the Korea institute for structural maintenance and inspection
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• v.17 no.4
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• pp.119-127
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• 2013

In cases of wooden structure and wooden house installed on the outside, metal goods used for basic connection are usually screw bolts, strainless nails and general iron nails. As metal connections on wood are directly exposed to exterior environment, friction resistibility of nails on metal connections declines and continual defects on this are generated and maintenance for it is required. However, experiments and analyses for preparing basic data for improvement of the problems have been not conducted so far and wooden structures with defects are abandoned. Accordingly, by analyzing friction resistibility of connections by each kind of woods and metal goods, the study aims to suggest to use metal goods appropriately by kinds of woods and manufacture conditions with analysis on characteristics of resistibility of extracting nails for solving such problems and to secure basic data for establishing maintenance, repair and reinforcement plans.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.2
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• pp.1188-1194
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• 2014

The purpose of this study is to estimate Chloride Attack Resistibility and mechanical properties of quaternary concrete adding fly ash, blast-furnace slag, and silica fume. Compressive strength, modulus of elasticity, chloride migration coefficient, charge passed from Rapid chloride penetration test(RCPT), and immersion testing in 3% NaCl are tested. Chloride migration coefficient and charge passed of quaternary concrete measured $0.032{\times}10^{-12}m^2/sec$ and 650 coulomb at 17 weeks, which are in a permitted limit. Also in immersion test, depth of chloride penetration and maximum chloride ion of quaternary concrete measured 3.7 mm and $10.211kg/m^3$ respectively. From the results, quaternary concrete adding fly ash, blast-furnace slag, and silica fume denotes improvement of mechanical properties and chloride attack resistibility.

• Proceedings of the Korea Concrete Institute Conference
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• 2000.10a
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• pp.661-664
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• 2000

It is known that high flowing concrete performs much higher fluidity, segregation resistibility and better placeability than normal concrete. However, it is hard to apply high fluidity concrete in field because of high manufacturing cost. Therefore, we intend to investigate the validity of segregation reducing type superplasticizer which is made by combining 0.61 of viscosity agent and 0.022 of AE agent for 1 of superplasticizer. Test are conducted on high flowing concrete using fly ash by applying segregation reducing type superplasticizer. According to experimental results, As contents of fly ash increase, fluidity, segregation resistibility and placeability shows favorable results. And also compressive strength at early age shows to be retarded, while it gains high strength at later age.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1999.08a
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• pp.252-261
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• 1999

The troubles such as slipping, pinching and other behaviors in the service of cold rolling mills often induce thermal shock crack on the surface of work roll, and considerably reduce their service lives. In order to evaluate thermal shock resistibility we use thermal shock tester generating frictional heat caused by a rotating disc contacting with test specimens. Thermal shock produces two heat affected layers below the roll surface, one is rehardened layer and the other is succeeding tempered layer. The maximum depth of crack occurred in a thermal shocked area is a criterion for the thermal shock resistibility. This paper describes on the investigation to the influence of hardness and residual stress.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.05a
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• pp.25-26
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• 2018

In this study, the device was developed for evaluating the effect of pressure on chloride ion penetration of concrete. And chloride-ion penetration depth and water soluble chloride contents was evaluated concrete using ordinary portland cement and blast-furnace slag cement using developed device. As a result, chloride ion penetration of concrete was promoted according to the action of pressure and the exposure period. and the incorporation of blast-furnace slag was effective for chloride attack resistibility under pressure.

• Journal of the Korea Fashion and Costume Design Association
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• v.16 no.1
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• pp.27-39
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• 2014

The purpose of this study is to investigate the formative characteristics and the aesthetic values of denim dresses from the 19th century until the $20^{th}$ century and analyze those changes shown in Paris Milan London New York collections from 2001 S/S to 2013/14 F/W. The results of this study are as follows; 1) In the mid-$19^{th}$ century, the denim pants were working suits. In the 1920's, they started to be recognized as ordinary clothing and they were supplied to women in World War II. In the 1950's, denim pants stood for youth and resistance, and they became popular among teenagers. In the 1960's, hippies who protested against the Vietnamese War would wear worn-out denim pants symbolizing peace and freedom. As they became more common in the 1970's, people all around the world wore the clothes. In the 1980's~90's, the waves of high class brand fashions brought in sensualism, extravagance, reactionary tendency, and so forth. Consequently, the aesthetic values of denim dresses have connotations of practicality, resistibility, ornamentation and femininity. 2) Practicality in recent collections is represented in classic fashion which features typical details and raw denim and modern fashion which is made with glossy denim and minimized details. Resistibility is represented in avant-garde fashion which features deformed or over-layered jackets and pants with damaged denim and vintage fashion which is made with wash-out and wild stone denim. Ornamentation is represented in ethnic fashion which is made with wash-out denim and ethnic prints and romantic fashion which features details such as ruffle, frill and shirring as well as lace and flowery decorations. Femininity is represented in sexy fashion which designs to expose or to focus in women's body and elegant fashion which is made with soft and glossy denim and hourglass silhouette.

• 한국도로학회:학술대회논문집
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• 2011.03a
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• pp.23-28
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• 2011