• Title/Summary/Keyword: Composite Waterproofing System

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Joint Displacement Resistance Evaluation of Waterproofing Material in Railroad Bridge Deck (철도교량상판 방수재료 선정을 위한 균열거동저항 성능평가)

  • Bae, Young-Min;Oh, Dong-Cheon;Park, Yong-Gul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.11
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    • pp.683-692
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    • 2020
  • A joint displacement resistance evaluation method for selecting waterproofing materials in railway bridge decks is proposed. The displacement range for an evaluation is determined by finite element method (FEM) analysis of a load case based on an existing high-speed PSC Girder Box railroad bridge structure. The FEM analysis results were used to calculate the minimum joint displacement range to be applied during testing (approximately 1.5 mm). For the evaluation, four commonly used waterproofing membrane types, cementitious slurry coating (CSC), polyurethane coating system (PCS), self-adhesive asphalt sheet (SAS), and composite asphalt sheet (CAS), were tested, with five specimens of each membrane type. The joint displacement width range conditions, including the minimum displacement range obtained from FEM analysis, were set to be the incrementing interval, from 1.5, 3.0, 4.5, and 6.0 mm. The proposal for the evaluation criteria and the specimen test results demonstrated how the evaluation method is important for the sustainability of high-speed railway bridges.

A Fundamental Study on Induction Technology of Separation Behavior Using Two-sided Adhesion of Joint of Composites Waterproofing System (시트-도막 복합방수공법의 접합부 2면 접착을 통한 분리거동 유도 기술에 관한 기초적 연구)

  • Park, Jin-Sang;Lee, Tae-Yang;Kim, Dong-Bum;Park, Wan-Goo;Heo, Neung-Hoe;Oh, Sang-Keun
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.3 no.3
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    • pp.212-219
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    • 2015
  • This study focuses evaluating the efficiency and performance evaluation of composite type sheet-membrane waterproofing method that utilizes a separation behavior inducement system designed to resolve the chronic problems of disintegration and damage of overlap areas of waterproofing layers. As the result of the test, the tensile strength value was at 13.8N/mm and elongation rate at 587% for the separation behavior inducement type specimen, and the compared specimens had 14.2N/mm for tensile strength and 335% for elongation rate. For the separation behavior adhesion method specimen, when tensile stress or displacement occurred, the Zero-Span tension occurrence did not follow, which resulted in that the bottom sheet layer and the top membrane layer did not simultaneously becoming damaged. When undergoing the top and bottom layers were separated through separation behavior due to lack of flexibility, the bottom layer began to damage at the primary stage, and with the allowed boundary the upper membrane layer began to display flexibility and showed continuous displaced resulting in secondary phase damaging.

The Structural Analysis of Corrugated Polyethylene-Plastic Form Panel and Concrete of Composite System (요철형 PE-PANEL과 콘크리트 합성구조물의 구조해석)

  • 김두환;박태인;박우영;한석규
    • Journal of the Korean Society of Safety
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    • v.16 no.2
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    • pp.91-96
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    • 2001
  • Theoretical definitions of mixed behavior of PE panel and connote should have preceded to cause a mixed behavior of connote and polyethylene which have different elastic module, one-line expansion coefficients, poison ratios, compressive strengths and tensile strengths. Consequently, changes are analyzed through experiment process to identify the effects on interpretation of mixed behavior on the basis of temperature change of structures, temperature rise of concrete other than PE panel due to hydration heat temperature rise of concrete other than PE panel due to drying and contraction, working of hydrostatic pressure by storage and temperature gradient From the results of interpretation of the analysis, it is concluded that PE panel have slight influences on the change of guess of structures and maintains structural stability compared with concrete structures without PE panel.

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Constructional Verification Evaluation for Securing the Field Quality of Composite Membrane Waterproofing Material (멤브레인 복합 방수재의 현장품질 안정성 확보를 위한 시공성 실증 평가 연구)

  • Kim, Meong-Ji;Lee, Sang-Wook;Kim, Soo-Yeon;Oh, Sang-Keun
    • Journal of the Korea Institute of Building Construction
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    • v.21 no.1
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    • pp.87-95
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    • 2021
  • In this study, seven companies(A~G) designated as new construction technology selected and evaluated KS F 2622: Method of test for performance evaluation of membrane roofing systems that are similar to field application conditions. As a result of the test, it was confirmed that although all test specimens exceeded KS standards in the basic physical, it was difficult to obtain field quality performance in weak areas such as joints and vertical parts of the adhesive coating method in water-tightness, sagging resistance, swelling resistance tests except for fatigue(crack behavior) tests.