• Title/Summary/Keyword: repair material and method

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A Study on the Change of Mass in Flow Velocity Using Loss Resistane Test Method - Using Synthetic rubber system Repair material - (유실저항성 시험방법을 이용한 유속조건에서의 질량변화 추이 연구 합성고무계 보수재료를 중심으로-)

  • Park, So-Young;Jang, Bo;Kim, Soo-Yeon;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.127-128
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    • 2017
  • Tests are conducted according to the ISO TS 16774, Part 3 standard for quality management of leakage repair materials used in cracks in underground concrete structures. These test methods are performed indirectly using a nonwoven fabric on a chalet containing leak repair materials. However, it is considered that it is appropriate to verify the resistance of the repair material, which is required to be applied directly to the cracks in the actual field and to exhibit the resistance of the flow velocity. In this study, mass change was measured by using nonwoven fabric and nonwoven fabric. As a result, both methods showed an increase in mass, which indicated that the maintenance material itself contained a large amount of water, and that the mass change occurred depending on the drying state. Also, depending on the use of nonwoven fabric, the error due to the indirect test could not be ruled out. Therefore, further verification is needed, and it is considered that the test for change of mass reduction measurement is necessary according to the drying time of other types of the same series.

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A Study on the Review of Repair Methods and Repair Materials for the Prevention of Fire spread of Building Exterior Materials (건축물 외장재의 화재확대방지를 위한 보수구법 및 보수재료 검토에 관한 연구)

  • Lee, Byeong-Heun;Jin, Seung-Hyeon;Park, Sung-Ha;Kwon, Young-Jin
    • Fire Science and Engineering
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    • v.33 no.3
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    • pp.105-111
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    • 2019
  • In Korea, the results of a field survey on the construction of flammable exterior materials implemented in 2018 revealed that 147,559 buildings belong to this category. It was found that the fire spreading cases in upper and adjacent constructions are about 3,500 per year, the fires of starting in flammable exterior material are about 1,500 per year. In this study, we investigated the repair method of buildings constructed by flammable exterior material and conducted performance verification of each repair materials for prevention of similar fire. In the case of the repair method, a method of reinforcing with a repair material after removing the existing building finishing material and a method of attaching the repair material after performing the face finishing are proposed. In addition, we conducted cone calorimeter tests of 6 materials such as fireproof gypsum board, mineral wool, hard urethane foam, ceramic board and ALC panel as dryvit and repairing materials, and investigated basic combustion performance of that materials.

Evaluation of Steel Corrosion and Flexural Strength Coated with Cementitious Repair Material (시멘트계 보수재료로 코팅된 강재의 부식 및 휨강성 평가)

  • Yoon, Yong-Sik;Kim, Tae-Sang;Kim, Ho-Ryong;Kwon, Seung-Jun
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.4 no.3
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    • pp.243-249
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    • 2016
  • The present work is for an evaluation of resistance to corrosion in steel coated with cementitious repair material, so that 3 cases of steel plate(Normal, Welding, Welding & coating case) are subjected to ICM(Impressed Current Method) for acceleration of corrosion for 7days. Tested and estimated corrosion ratio through Faraday's Law are compared, and the related flexural strength are evaluated. In Normal and Welding cases, similar level of corrosion ratio(70%) is evaluated, however only 17% level of corrosion ratio is evaluated in the Welding & coating case, which indicates that cementitious repair material is effective to anti-corrosion due to a block of chloride penetration. The flexural test results are consistent with those in accelerated corrosion test, which shows a significant flexural strength in Welding & coating case by 3.4times greater than the others. The cementitious material repair coating is evaluated to be effective to anti-corrosion in welding of steel plate.

A Study for Selection and Field Applicability of Asphalt Precast Pothole Repair Materials (아스팔트 프리캐스트 포트홀 보수재료의 선정과 현장 적용성에 관한 연구)

  • Kim, Jincheol;Bae, Sungho;Lee, Jinho;Yang, Jaebong;Kim, Jiwon
    • International Journal of Highway Engineering
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    • v.16 no.4
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    • pp.21-33
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    • 2014
  • PURPOSES: The purpose of this study was to break away from the workforce method using cold-mix asphalt mixtures and has a constant quality and has develop repair materials of pre-production asphalt-precast types. METHODS: The selection of the repair material was determined as the results obtained through physical properties of materials and the field applicability. In case of repair materials, values obtained through Marshall stability test & the dynamic stability test & retained stability test as well as the site conditions was considered. In case of adhesive, test results were obtained through examination of the bond strength(tensile, shear) and the field applicability of the adhesive was examined through combined specimens to simulate field applications. RESULTS : According to the results of laboratory tests, in the case of repair materials, Marshall stability and dynamic stability, retained stability of cold-mix reaction type asphalt mixture is the highest. In the case of adhesive, two-component epoxy-urea has a very high bonding strength(tensile, shear) was most excellent. According to the results of field tests, when epoxy-urea was excellent workability. Also, the repair body through actual mock-up test did not occur large deformation and fracture after 12 months. CONCLUSIONS : A suitable repair material is cold-mix reaction type mixture of asphalt-precast, a suitable adhesive is a two-component epoxy-urea.

A Study on the Performance Evaluation of Repair Material and Method for Reinforced Concrete Structure by tong Term Exposure Experiment (장기폭로실험에 의한 철근콘크리트 구조물 보수재료 · 공법의 성능평가에 관한 연구)

  • Kim Moo-Han;Kim Yong-Ro;Kim Jae-Hwan;Ho Jang-Jong;Cho Bong-Suk
    • Journal of the Korea Concrete Institute
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    • v.16 no.5 s.83
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    • pp.659-666
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    • 2004
  • In this study, for the establishment of the performance evaluation methods and the quality control standard of durability recovery method, the quantitative exposure data by long term exposure test under the coast and air environment is accumulated and analyzed. Investigating and evaluating the result of exposure test during 18 months of exposure age under the coastal and normal atmosphere environment, micro crack, swelling and spatting of surface coating material crack of repair standards of repair material and method through continuous exposure test in the future.

A Study on the Evaluation Method of Water Leakage Repair in Polyacrylic Resin (폴리 아크릴 레진의 누수 보수 평가에 관한 연구)

  • Cho, Il-Kyu;Kim, Keun-Hur;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.11a
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    • pp.223-224
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    • 2017
  • In this study, various materials such as epoxy material, urethane material, cement material, and acrylic material are used to solve the water leakage occurring in underground structures. However, in the reality that the durability is insufficient and the effect is insufficient, it is aimed to improve the repairing effect by using cement and acrylics in combination. As a first study, we tried to verify the performance of improve the performance by checking the product properties according to the composition ratio of polyacrylic resin. Polyacrylic resin is evaluated in three different composition ratios. When the material is selected for polyacrylic resin, it is applied to the field to understand the maintenance effect and durability.

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Repair and Strengthening Methods for Concrete Structures using Sprayed Fiber Reinforced Polymers - Material Property of Sprayed FRP - (Sprayed FRP 공법에 의한 콘크리트 구조물의 보수.보강법 개발에 관한 연구 - Sprayed FRP를 구성하는 재료특성에 관한 연구 -)

  • Lee, Li-Hyung;Lee, Kang-Seok;Son, Young-Sun;Byeon, In-Hee;Lim, Byung-Ho;Na, Jung-Min
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.141-144
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    • 2006
  • The main purpose of this study is to develop a Sprayed FRP repair and strengthening method, which is a new technique for strengthening the existing concrete structures by mixing carbon or glass shot fibers and the epoxy or vinyl ester resins with high-speed compressed air in open air and randomly spraying the mixture onto the concrete surface. At present, the Sprayed FRP repair and strengthening method using the epoxy resin has not been fully discussed. In order to investigate the material property of Sprayed FRP, this study carried out tensile tests of the material specimens which are changed with the combinations of various variables such as the length of shot fiber and mixture ratio of shot fiber and resin. These variables are set to have the material strength equal to one layer of the FRP sheet. As a result, the optimal length of glass and carbon shot fibers were derived into 3.8cm, and the optimal mixture ratio was also deriver into 1:2 from each variable. And also, the thickness of Sprayed FRP to have the strength equal to one layer of FRP sheet was finally calculated.

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Evaluation of Chemical Resistance Performance of Synthetic Rubber and Cement Based Injection Repair Materials Used in Underground Concrete Structures (지하 콘크리트 구조물에 적용되는 합성고무계 및 시멘트계 주입형 보수재료의 화학 저항성능평가)

  • Kim, Soo-Yeon;Lee, Yeon-Sil;Song, Je-Young;Kim, Byoungil;Oh, Sang-Keun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.21 no.5
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    • pp.148-155
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    • 2017
  • In this study, by using the international standards ISO TS 16774, Part 2 Test method for chemical resistance as a quality control method of injection type repair material used for leakage crack of underground concrete structure, the performance requirement against of chemical environment of underground concrete structures for repair materials was tested. For this testing 3 types for each of the 2 classes of repair materials(synthetic rubber, cement), with a total of 9 types repair materials, were selected and examined. As a result, the test results showed that the smallest performance deterioration by the change in the mass was with the synthetic rubber(RG) type as opposed to the cement type system, showing that the synthetic rubber type had the strongest relative resistance to chemical exposure. Furthermore, it is necessary to investigate the material with high resistance to chemical substances and to examine the material which can increase resistance to sodium hydroxide and sodium chloride in cement system. These results can be used as a basic index for the selection of repair materials with the strongest resistance to chemical environment found in concrete structures. In addition, it is expected that the test results derived in this study can be used as reference data that can be reflected in the quality improvement of the maintenance material to be developed later.

Ashpalt 2 Component Adhesive Leakage Repair Sealant Evaluation (아스팔트 2액형 점착재의 누수보수 평가에 관한 연구)

  • Cho, Il-Kyu;Kim, Keun-Hur;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.140-141
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    • 2017
  • This study is based on the evaluation of a single component injection type adhesive repair material and a new 2 component type used in leakage of underground concrete structures. The studies showed that based on different mix ratio of the 2 component type adhesive sealant comprised of an asphalt main and latex mixture agent the viscosity of the material compound differed significantly. Based on a permeability testing, injection and economic efficiency, and performance, the appropriate ratio was determined to be 6:1 and was proceeded to the KS F 4935 evaluation method. The 2 component type adhesive sealant uses a static mixer and a cartridge type container for the injection procedure and was able to satisfy the evaluation criteria outlined in the KS F 4935 standard.

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Studies on Bond Properties of Repair Materials (보수.보강재료의 부착 특성에 관한연구)

  • 김진선;김경원;한만엽;정영수;홍영균
    • Proceedings of the Korea Concrete Institute Conference
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    • 1995.10a
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    • pp.293-298
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    • 1995
  • This study experimentally evaluate the bonding performance of repair and strengthening materials. It is very important problem to justify bonding properties between repair and strengthening materials and old concrete. Many previous research and investigation showed that bonding strength of reinforcing materials determines the strengthening effect and the durability of repair work. Therefore, menifestation of bonding properties and the improvement of bonding performance of repair and strengthening materials are very important. In order to improve the perforamnce of repair work, it needs to investigate the behavior of bonding materials, such as stress distribution along the bonding area and the long term performance of the material. The target repair methods are steel plate addition technique and repair mortar method, and the test parameters studied in this paper include epoxy thickness, bonding surface texture, and bonding area.

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