• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2011.11a
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• pp.25-25
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• 2011

폴리올레핀 섬유인 폴리프로필렌과 초고분자량 폴리에틸렌 섬유는 경량성, 속건성, 보온성, 고강도와 같은 여러 장점에도 불구하고 융점(폴리프로필렌: 약 $160^{\circ}C$, 초고분자량 폴리에틸렌: 약 $150^{\circ}C$)이 다른 섬유에 비해 낮아 내열성이 약하여 제품으로서의 가공공정이나 사용 시에 고온을 피해야 하는 주의를 필요로 하고, 곁가지가 거의 없어 섬유분자의 구조가 매우 조밀하며 탄소와 수소로만 이루어진 분자구조에 의한 극단적인 소수성성질은 현재 상용화되어 있는 염료와 염색방법으로의 후염 염색이 거의 불가능한 것으로 알려져 왔다. 이에 본 연구팀에서는 폴리프로필렌과 초고분자량 폴리에틸렌 섬유에 염색 가능한 청색염료를 합성하였다. 염료의 합성에는 leucoquinizarine과 alkylamine(hexyl, heptyl, octyl)의 1:2mole 반응을 이용하여 안트라퀴노이드 구조의 알킬기가 치환된 소수성 염료를 합성하였다. 합성된 염료를 섬유에 염색해본 결과 폴리프로필렌의 경우 농색의 색상강도를 나타냈으며 초고분자량 폴리에틸렌에서는 중색의 색상 강도를 보이는 것으로 확인되었다. 견뢰도 측면에서는 폴리프로필렌의 경우 세탁, 마찰 및 일광견뢰도에서 모두 4~5등급 우수한 결과를 보였다. 초고분자량 폴리에틸렌의 경우 4~5등급의 세탁, 마찰 견뢰도를 가지는 것으로 나타났고, 일광견뢰도는 3~4등급으로 비교적 낮게 나타났지만 공업적으로 널리 이용되는 분산염료에 의해 염색된 제품의 일광견뢰도와 비슷한 수준임을 알 수 있었다.

• Magazine of the Korea Concrete Institute
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• v.8 no.6
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• pp.151-161
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• 1996

Recently, polypropylene fiber reinforced mortar and concrete as civil and architectural materials have been used in major countries in the world. Polypropylene fiber reinforced concrete has many advantages in terms of economical aspect, chemical stability and durability. It has been reported that polypropylene fiber can control restrained tensile stresses and cracks and increase toughness, resistance to impact, corrosion, fatigue and durability. The purpose of the present study is, therefore, to investigate the strength as well as many mechanical characteristics including toughness and shrinkage control properties. A specially devjsed shrinkage test has been applied to measure the crack control characteristics of polypropylene fiber reinforced concrete. The present study indicates that the polypropylene fiber reinforced concrete curbs greatly the crack occurrence due to shrinkage and enhances toughness resistance. The present study provides a firm base for the efficient use of polypropylene fiber reinforced concrete in actual construction such as pavements and slab structures.

• Journal of Adhesion and Interface
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• v.8 no.3
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• pp.9-15
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• 2007

The interfacial evaluation of surface modified Jute fiber/polypropylene (PP) composites before and after hydration was investigated using micromechanical test and dynamic contact angle measurement. The IFSS of alkaline and silane-treated Jute fiber/PP composites increased, whereas after hydration, the IFSS of the untreated, alkaline- and silane-treated Jute fibers/PP composites decreased due to swelled fibrils by water infiltration. The interfacial adhesion of silane treated fiber/PP composites was higher than alkaline-treated or the untreated cases. The surface energies of Jute fiber treated under various conditions were obtained using dynamic contact angle measurement. Especially after hydration, the thermodynamic work of adhesion was calculated by considering water interlayer, which indicated the stability of IFSS between silane treated Jute fiber and PP matrix showing better than others.

• Proceedings of the Korean Fiber Society Conference
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• 1994.04a
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• pp.84-84
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• 1994

• Journal of Korean Tunnelling and Underground Space Association
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• v.7 no.4
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• pp.323-333
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• 2005

Recently the fire is happening at the tunnel and underground - structure internationally. We are socially the economy the actual circumstances which serious loss is happening due to an fire occurrence when fire happened which is closed like tunnel and underground - structure, the collapse from the burglar degradation of strength of tunnel concrete lining and human life damage happen. It causes big problem while the long time disconnects a traffic network. While the fire happened in this research at the tunnel, the paper construct a basis data to deduce the specification regulation about stability of tunnel concrete lining. In this paper, the experiment was carried out for the prevention of explosive spalling of tunnel to use a reinforced Polypropylene concrete which mixes a Polypropylene which are known for the thing by being efficient at a protect of explosive spalling of the concrete. According to the firproof test result of reinforced Polypropylene admixture mortar, Polypropylene admixture of prevention of explosive spalling analyzed 0.2%-0.25%.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.457-460
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• 2008

This study evaluated fire resistance performance for polypropylene/steel fiber reinforced high strength concrete column. Full-size columns were constructed and tested with or without fibers using ISO-834 fire curve. As the result of test, non-fiber high strength concrete column specimen occurred serious spalling and indicated rapidly internal temperature increase. Specimen with polypropylene fiber occurred not spalling. Specimen with hybrid fiber occurred not spalling as well as does not propagated temperature propagation. Therefore, hybrid fiber reinforced column specimen indicated a good fire resistance performance than other cases.

• Journal of the Korean Recycled Construction Resources Institute
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• v.7 no.4
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• pp.438-444
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• 2019

In this study, the effect of polypropylene fiber on the freeze-thaw damage of mortar was evaluated experimentally. The effects of the reinforcing of polypropylene fiber on the compressive and bending performance of mortar after 300 cycles of freeze-thaw test were evaluated by comparing the normal mortar and the mortar with polyvinyl alcohol fiber. In addition, the mass loss, relative dynamic elastic modulus, and cumulated pore volume of mortar were measured by each cycle of freeze-thaw test. As a result, it was confirmed that the fiber reinforced mortar, regardless of the fiber type, was effective not only in maintaining the performance of the compressive strength and the bending strength but also suppressing the mass loss after the freeze-thaw test of 300 cycles. Meanwhile, it was confirmed that not only polyvinyl alcohol fibers but also polypropylene fibers can effectively act to suppress the damage of the mortar by freeze-thaw. However, in order to improve the freeze-thaw resistance of mortar mixed with polypropylene fiber, it is necessary to increase the bonding performance with the cement matrix which can be expected from polyvinyl alcohol fiber.

• The Korean Journal of Rheology
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• v.6 no.2
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• pp.147-156
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• 1994

폴리프로필렌 이산화티타늄 첨가 폴리프로필렌을 심초형 복합 방사하여 첨가제를 섬유의 중심부분, 또 표면부분에 차별분포시켰다. TiO2의 함량이 증가함에 따라 점도(η)와 저장탄성계수(G＇)는 증가하였다. 전자현미경으로 파단면의 모폴로지를 관찰한 결과 TiO2와 함량이 증가함에 따라 감소하는 경향을 보였다. TiO2의 함량 증가에 따라 강력, 절단신도, 그리고 탄성계수는 감소하였다. 복합방사한 섬유의 TiO2 함량이 2% 미만일 때는 homo PP 보다 강력이 좋아졌다. 복합 섬유의 탄성계수는 중심부에 homo PP가 분포한 경우가 더 컸 고 강력과절단 신도는 중심부에 filled PP가 분포한 경우가 더 컸다.

• Journal of the Korean Recycled Construction Resources Institute
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• v.8 no.2
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• pp.212-218
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• 2020

The purpose of this study is to investigate the fire resistance of ultra-high-performance concrete according to the amount of polypropylene fiber. Different mixtures according to the amount of polypropylene fiber were exposed to a maximum temperature of 900℃; and explosive spalling, residual compressive strength, and ultrasonic velocity of each specimen were evaluated. Test results showed that the fire resistance can be improved by including a small amount of polypropylene fiber in ultra-high performance concrete. It was not observed that explosive spalling occur at a temperature of 900℃ when the polypropylene fibers over 0.4% were included. Residual compressive strength and ultrasonic velocity decreased by 48% and 44%, respectively, compared to those at room temperature.

• Journal of the Korea Concrete Institute
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• v.20 no.6
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• pp.821-826
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• 2008

This study evaluated spalling and internal temperature distribution after elevated temperatures test for high strength concrete ($f_{ck}=60\;MPa$) column member with various polypropylene fiber volume fractions. The ISO-834 time-temperature curve was used for measurement of fire resistance properties. As the result of test, average internal temperature results indicated to low temperature in increased polypropylene fiber volume fraction. But, the highest internal temperature results show that does not difference in proportion of polypropylene fiber volume fractions.