• Journal of the Korea institute for structural maintenance and inspection
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• v.14 no.1
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• pp.102-108
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• 2010

The main objective of this study was to evaluate the effect of recycled PET (RPET) fiber made from waste PET bottles to examine application on concrete member. To evaluate the reinforcement effect of RPET fiber in concrete member, experimental tests were performed, such as mechanical property tests (compressive strength, modulus of elasticity and splitting tensile strength) and drying shrinkage test. In mechanical property tests, compressive strength and modulus of elasticity in concrete mixed with RPET fiber gradually decreased, but splitting tensile strength gradually increased as volume fraction of fiber increased. In drying shrinkage test, free drying shrinkage increased. In restrained case, in contrast, crack occurrence was delayed because of tensile resistance increase by RPET fiber. The comparison of RPET and PP fiber added concrete specimen's properties showed that two materials had similar properties. In conclusion, RPET fiber is an alternative material of PP fiber, even finer for its excellence in eco-friendliness due to the recycling of waste PET bottles and its possible contribution to the pollution declination.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.177-180
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• 2008

SHCC shows the high energy tolerance capacity due to the interfacial bonding of the fibers to the cement matrix. For effective material design and application of SHCC, it is needed to investigate the damage process and micro-fracture mechanism of cement matrix reinforced with different types of fibers. The objective of this paper is to investigate the direct tensile response of cement composites reinforced with single and hybrid fibers using acoustic emission(AE) technique. In this study, the correlations between AE signal and result of the direct tensile response of SHCC. For these purposes, three kinds of fibers were used: PET1.5%, PET1.0+PE0.5%, PET1.0%+PVA0.5%. The result of the direct tensile response of SHCC, for the same volume fraction of fibers, ultimate strength of PET-PE specimen was 2.7 times higher than specimens with PET fibers. And from AE signal value, AE event numbers and cumulative energy were different according to kind of fiber because of the different material properties of reinforced fiber.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.797-800
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• 2008

To decrease the usage of cement, the pozzolan reaction materials are used as a mineral admixture. Hwang Toh which is broadly deposited in Korea is well known as a environment friendly material and the activated Hwang Toh which has the property of pozzolan reaction is practically used as a mineral admixture of concrete. PET fiber which is made by recycled PET bottle controls micro crack in concrete. But the study about concrete mixed with reinforcing fiber is not enough and the property of Hwang Toh concrete mixed with PET fiber is more complicated case. So this study performed drying shrinkage experiment to analyse mechanical property of Hwang Toh concrete mixed with PET fiber.

• Proceedings of the Korean Fiber Society Conference
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• 1998.04a
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• pp.320-324
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• 1998

PET 섬유는 현재 가장 중요한 합성섬유의 하나로 널리 사용되고 있다. PET 섬유의 방염가공용 가공제로는 그 동안 tris(2,3-dibromopropyl) phosphate(TBPP)가 가공효과의 탁월성과 가공의 용이성 때문에 독점적으로 사용되어져 왔으나 발암물질로 밝혀져 그의 사용이 금지됨에 따라 기존 방염제의 이용에 관한 새로운 검토와 함께 새로운 방염제의 합성이 진행되었다.$^{1,2}$ 그러나 TBPP의 성능에 대등할만한 방염제의 개발은 아직도 미진한 것으로 평가되고 있다.(중략)

• Proceedings of the Korean Fiber Society Conference
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• 2001.10a
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• pp.351-354
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• 2001

Poly(ethylene terephthalate) (PET)는 물리적, 기계적 성질이 우수한 엔지니어링 플라스틱의 하나로 섬유, 필름, 및 여러 가지 용도로 다양하게 사용되고 있다. PET는 DMT(dimethyl terephthalate) 또는 TPA(terephthalic acid)와 EG(ethylene glycol)를 축합 중합하여 제조한다. (중략)

• Proceedings of the Korean Fiber Society Conference
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• 2003.04a
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• pp.331-332
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• 2003

Poly(ethylene terephthalate) (PET)는 물리적, 기계적 성질이 우수한 엔지니어링 플라스틱의 하나로 섬유, 필름 및 각종 산업용 소재로 가장 널리 이용되고 있는 고분자 중의 하나이다. 그러나 PET 자체의 성질만으로 고기능성 소재로의 다양한 요구를 충족시키기에는 한계가 있어 PET의 벤젠고리 대신에 나프탈렌 고리로 치환하거나 제 3성분의 2가 알코올을 첨가하여 PET보다 유리전이 온도와 용융 온도가 높고 형태안정성 및 기계적 물성이 우수한 고분자의 개발에 관한 연구가 다수 이루어져 왔다.$^{1.2}$ (중략)

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2008.10a
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• pp.85-86
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• 2008

신규섬유의 하나인 super-soft형 PET직물 및 이의 교직물을 염색한 결과, 100% 직물의 경우 기존의 PET 섬유에 비해 약 $10^{\circ}C$ 낮은 온도에서 염착이 시작되며 최종 염착률은 $90{\sim}99%$로 PET와 유사하였다. 교직물의 경우 2단2욕법의 염색방법을 통해 염색하였으며 side간 색상차를 보였다. super-soft형 PET섬유의 경우 첨가된 무기물의 영향으로 색상이 다소 dull 해 지는 경향을 보인다.

• Journal of Korean Tunnelling and Underground Space Association
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• v.16 no.3
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• pp.311-320
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• 2014

High strength concrete is not only vulnerable to the occurrence of spalling which generates the loss of cross-section in concrete structures but produces faster degradation in its mechanical properties than normal strength concrete in the event of fire. This study aims to evaluate fire resistance of high strength segment concrete with PET fibers mixed to prevent spalling under ISO834 (2hr) and RABT fire curve. As results, the samples without PET fibers show the concrete loss up to the depth of about 8 cm and 9.5 cm from the surface exposed to fire under ISO834 and RABT fire curve respectively. The samples mixed with PET fiber of 0.1% show no spalling under ISO834 fire curve and the spalled thickness of 6.5 cm under RABT fire curve after the fire tests. Finally, the sample mixed with PET fiber of 0.2% shows no spalling under RABT fire curve. The results indicate that the suitable amounts of PET fiber for securing fire resistance performance of this high strength segment concrete are 0.1% under ISO834 fire curve and 0.2% under RABT fire curve. However, even though spalling does not occur, it is necessary to repair the deterioration of concrete up to 4 cm from the surface exposed to fire after fire.

• Journal of the Korea institute for structural maintenance and inspection
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• v.17 no.1
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• pp.114-123
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• 2013

This study was performed to verify the structural reinforcing effect of recycled polyethylene terephthalate (PET) fiber. In order to verify the structural reinforcing capacity of RPET fiber, recycled PET fiber added RC slab specimens were prepared to examine the flexural capacity while those of plain concrete and those of added with PP fiber, and the behavior of the specimens were also evaluated. The result shows that the compressive strength reduces as the fiber volume fraction increases, and the rate of reduction varies from 2% to 7%. The result of the flexural capacity shows that the ultimate capacity of plain specimens is the highest compare to those fiber reinforced specimens, but it has shown that specimens reinforced by 5% PET fiber has the highest energy absorption and the ductility index. In the application of PET fiber in slab specimens has shown that ductility capacity have increased where the ultimate capacity decreasing. That is the different tendency of beam specimens, which the ultimate capacity and the ductility of those have both shown the improvement compare to plain concrete specimens, which means the reinforcing effect of PET fiber in slab is less strong than in beam. Therefore, the application of PET fiber in slab structures as reinforcement needs the proper mix proportion of concrete and volume fraction of PET fiber with deep consideration of the structures.

• Proceedings of the Korean Fiber Society Conference
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• 1998.10a
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• pp.70-74
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• 1998

최근 PET filament를 5,000m/min 이상의 고속방사법으로 생산하는 것이 기업체에서 점차 일반화되어 가는 추세를 보이고 있는데, 고속방사법의 장점으로는 공정이 단순해지고 생산성을 올릴 수 있기 때문에 에너지와 인력비용을 절감할 수 있을 뿐 만 아니라, 고속방사법으로 제조된 PET 섬유는 기존의 방식으로 제조된 PET 섬유에 비하여 염색성이 우수하고, 알칼리감량 속도가 빠르며 부드러운 태를 보이기 때문에 새로운 용도를 창출할 수 있는 점을 들 수 있다. (중략)