• Title/Summary/Keyword: waterproof capacity

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An Experimental Study on the Waterproof Effect of Powder Self Waterproof Admixture according to the Water-Cement Ratio (물시멘트비에 따른 분말형 구체방수재의 방수효과에 대한 실험적 연구)

  • 박선규;김용로;신홍철;배기선;오상근;김무한
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.04a
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    • pp.108-113
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    • 1999
  • In structures, it is important to improve the capacity of waterproof in aspect of the durability and management of maintenance. Among the method of waterproof, self waterproof method is to improve the capacity of waterproof of structure itself. Thereby, we can expect the effect of durability and economics. In this study, we investigated the adding effect of waterproof admixture according to the water-cement ratio when used powder self waterproof admixture and analyzed the change of microstructure. Also, we were made to clear the mechanism of self waterproof admixture and intended to suggest the basic data on developing self waterproof admixture.

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Design Study on Waterproof 4-axis Manipulator (방수형 경량 로봇팔의 설계 연구)

  • Choi, Hyeung-Sik;Jo, Jong-Rae;Woo, Myoung-Man;Seo, Jung-Min;Ju, Young-Do;Kang, Jung-Suk
    • Journal of Ocean Engineering and Technology
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    • v.27 no.2
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    • pp.100-106
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    • 2013
  • This paper deals with the design method for a small waterproof 4-axis robot arm. An extensive analysis was performed on the torque applied to the robot joint as a result of the payload, as well as the design of the joint actuator capacity. In addition, a study was undertaken on the design of a waterproof joint actuator that works at depths greater than 10 m and the wiring design for a small waterproof connector to avoid obstructing the robot motion. Finally, a finite element method simulation was carried out to analyze the strength of the designed robot arm link, and its stability was verified through a simulation test.

Evaluation of waterproof and durability of hydrophilic waterstop (수팽창 지수재의 방수 성능 및 내구성 평가)

  • Choi, Woo-Yong;Lee, Hyeun-Pil;Jun, Gy-Chan;Lee, Seok-Won
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.16 no.2
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    • pp.117-124
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    • 2014
  • The interest in the use of shield TBM (Tunnel Boring Machine) on the tunnel excavation has been increased rapidly in Korea. The shield TBM tunnel is generally designed as non-drainage tunnel. Consequently, if water leakage through the segment joints happens, big problems on the usage and stability of tunnel can be occurred. In this study, the variation of waterproof capacity of hydrophilic waterstop by the construction error and excessive displacement of segment was studied firstly. Secondly, the decrease of durability of hydrophilic waterstop by the sulphate and chloride contained in the groundwater and seawater was investigated. The results showed that if the angle discordance at the segment joints is beyond the 2 degree, the proper waterproof capacity of hydrophilic waterstop can not be guaranteed. In addition, if the hydrophilic rubber waterstop is exposed to the sulphate for a while, the proper durability of hydrophilic waterstop can not be expected.

The Efficiency Analysis of Tracking-Type Floating PV System (추적식 수상 태양광 발전 시스템 성능 분석)

  • Yang, Yoen Won;Jeong, Seon Ok;Shin, Hyun Woo;Lee, Kil Song
    • Current Photovoltaic Research
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    • v.1 no.2
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    • pp.122-125
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    • 2013
  • The Floating Photovoltaic System was installed on the surface of water. There were some researches in this subject. But there was not many studies with experiment on a high waterproof Floating Photovoltaic modules. The aim of this study was to analyze the performance of the Floating Photovoltaic System. For this experiment, a high waterproof Floating Photovoltaic modules were designed and applied to the module capacity of 10 kW Tracking-Type structure. The experiment results indicated the performance of the daily production is 51.6 kW; the production capacity of Floating Photovoltaic System is expected to be 23% higher than that of the ground-mounted photovoltaic system.

A study on the choice of the best method of construction for building insulation and waterproof (건축물의 단열방수의 최적 공법및 구법 선정 방법론에 관한 연구)

  • Lee, Sung-Goo;Park, Tae-Keun
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • 2006.11a
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    • pp.654-658
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    • 2006
  • To solve some problems that reveals in the exiting stickiness problem of the housetop, the housetop finishing impact layer can be displaced by the existing concrete block. By doing in this way, this need is rising that the excess cost should be reduced and the materials should be recycled in repairing. According to the above, this study is going to suggest the basic data on building and using of the dry process method by estimating and analyzing a overall determinate quantity through the experiment on the insulation performance among the capacity items on the outside insulation waterproof dry process suggested. In addition, choosing the building method according to the use, the peculiar property and the importance of the building can be possible by analyzing the defect causes happening in the rooftop insulation and waterproof, suggesting the better method and classifying the most proper choosing methods for the need of the building according to the importance of the main factors.

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Optimum design of injection mold heater for uniform curing of LSR seal for waterproof connector (방수 커넥터용 LSR Seal의 균일 경화를 위한 사출 금형 히터의 최적 설계)

  • Song, Min-Jae;Cha, Baeg-Soon;Hong, Seok-Kwan;Ko, Young-Bae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.7
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    • pp.310-315
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    • 2017
  • Automotive waterproof connectors are highly functional parts that must be air-tight in a complex environment. In the LSR multi-cavity injection molding process for manufacturing waterproof connectors, it is important to maintain a uniform curing temperature between the cavities in order to obtain a quality product. For this purpose, we designed the capacity of the cartridge heater differently for each position, and then linked the heat transfer analysis and optimization module to obtain the optimal cartridge heater capacity. As a result of the optimization analysis, the temperature deviation between cavities was decreased from $13.1^{\circ}C$ to $8.1^{\circ}C$ compared with the case in which constant heater capacity was applied, so that the design criterion could be satisfied within a temperature deviation of $10^{\circ}C$ for uniform curing. This study suggests that this method can be applied efficiently to the design of a large area multi-cavity LSR mold heater.

Waterproofing performance evaluation according to the number of layer for shield TBM segment hydrophilic rubber waterstop (쉴드 TBM 세그먼트 지수재의 배열수 변화에 따른 방수성능 평가)

  • Ham, Soo-Kwon;Jung, Hoon;Kim, Beom-Ju;Jeong, Kyeong-han;Lee, Seok-Won
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.22 no.1
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    • pp.47-58
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    • 2020
  • The interest in the use of shield TBM (Tunnel Boring Machine) on the tunnel excavation has been increased rapidly in Korea. The shield TBM tunnel is generally designed as non-drainage tunnel. Consequently, if water leakage through the segment joints happens, big problems on the usage and stability of tunnel can be occurred. In this study, the variation of waterproof capacity of hydrophilic rubber waterstop by the construction error and excessive displacement of segment was studied. In particular, the waterproof capacity of each of single and double layer arrangements of hydrophilic rubber waterstop was examined to verify the efficiency of the double layer arrangement. The test results show that the single layer and double layer hydrophilic rubber waterstop showed the same waterproof performance. hydrophilic rubber waterstop has favorable on the offset, however unfavorable on the gap.

A Fundamental Research on the Microscopic Texture of Hardner Mixed with the Structure Compound Waterproof Agent (구체방수제를 혼입한 시멘트 경화체의 미세조직에 관한 기초적 연구)

  • Kim KwangKi;Park HeGon;Kim WooJae;Kim Sang Kyu;Song ByungChang;Jung SangJin
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.11a
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    • pp.497-500
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    • 2004
  • Recently, the use of structure compound waterproof agent (hereinafter referred to as 'SCWA') that is used when manufacturing concrete for concrete structures, increases in quantity. However, while it is expected that the SCWA that is mixed in the concrete inside can significantly affect the change of physical properties that lift the internal force of a structure. This study has been conducted through an experiment for the effects of cement hardener on the formation of microscopic texture, and newly generated hydrates from that result were not confirmed in the present experiment. It was found that at the hydrate reaction it has the property that can be hardened within the limit of pore diameterar a specific size rather than there is the internal gap filling capacity due to generating other hydrates.

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The Development of the Hydrophobic - Low Viscosity Filling Material for the Surface Treatment for Pavement Preventive Maintenance (예방적 유지보수를 위한 소수성 저점도 AP 표면처리재 개발)

  • Choi, Jun Seong;Kim, Jo Sun
    • International Journal of Highway Engineering
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    • v.16 no.2
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    • pp.35-41
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    • 2014
  • PURPOSES : Surface treatment is a favorable method in the pavement preventive maintenance. This study (Part I) aimed to develop the low viscosity filling material for waterproof characteristics and high penetrable and weather resistance, and a series of companion study (Part II) presents the coating characteristics and performance analysis using field and lab tests. METHODS : Hydrophobic characteristics of the advanced surface treatment material are observed and measured the filling depth and the permeability for sand and asphalt pavement specimen using the water absorption test and permeability test, X-RAY CT test. Color difference for the weather resistance using ultraviolet ray accelerated weathering test is compared with asphalt pavement specimens. RESULTS : The developed material shows the decreased water absorption and increased impermeable effect because of the hydrophobic characteristics. It is found that the filling depth is about 6mm and weather resistance is better than asphalt pavement specimen. CONCLUSIONS : The advanced hydrophobic - low viscosity filling treatment material is developed in this study (Part I) to improve the waterproof characteristics and high filling capacity and weather resistance for the pavement preventive maintenance.

Development and Applicability Evaluation of High Performance Poly-urea for RC Construction Reinforcement (RC 구조물 보강을 위한 고성능 폴리우레아의 개발 및 적용성 평가)

  • Kim, Sung Bae;Kim, Jang-Ho Jay;Choi, Hong-Shick;Heo, Gweon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.30 no.2A
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    • pp.169-176
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    • 2010
  • Generally, poly-urea is widely used as waterproof coating material due to its superior adhesiveness, elongation capacity, and permeability resistance. In addition, it can be quickly and easily applied on structure surfaces using spray application. Since it hardens in about 30 seconds after application, its construction efficiency is very high and its usage as a special functional material is also excellent. However, currently, poly-urea is mostly used as waterproof coating material and the researches on its usage as a retrofitting material is lacking at best. Therefore, basic studies on the use of poly-urea as a general structural retrofitting material are needed urgently. The objective of this study is to develop most optimum poly-urea composition for structure retrofitting purpose. Moreover, the structural strengthening capacity of the developed poly-urea is evaluated through flexural capacity experiments on RC beams and RC slabs. From the results of the flexural test of poly-urea strengthened RC beam and slab specimens, the poly-urea and concrete specimen showed monolithic behavior where ductility and ultimate strength of the poly-urea strengthened specimen showed slight increase. However, the doubly reinforced specimens with FRP sheet and poly-urea showed lower capacity than that of the specimen reinforced only with FRP sheet.