• Title, Summary, Keyword: waterproof test

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A durability feature of concrete using inorganic waterproof agent (무기계 방수 혼화제 사용 콘크리트의 내구특성)

  • 문수동;이상호;문한영
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.343-348
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    • 2003
  • Generally, waterproof agent has been used only for the waterproof effect. But in this paper, through the durability test of concrete using inorganic waterproof agent, we recognized that the concrete using this agent is more excellent in some peculiar properties of durability than general concrete. In this paper, we did compressive strength test, permeability test, pore volume test, etc. And the conclusion is as followings. The concrete of using this agent is more excellent in economy, waterproof, durability, strength.

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Centrifuge Model Experiments on Behavior of Waterproof Dike in Progress of Construction (원심모형실험을 이용한 방수제 안정성 검토)

  • Yoo, Nam-Jae;Kim, Dong-Gun;Lee, Dong-Won
    • Journal of Industrial Technology
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    • v.31 no.A
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    • pp.79-86
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    • 2011
  • This paper is results of centrifuge model experiment of investigating geotechnical engineering behavior of waterproof dike, located in soft grounds, in Saemankem in progress of construction. Centrifuge test with artificially increased gravitational level of 50g were performed to find ground settlements and excess pore-pressures developed during construction of waterproof dike by simulating the construction stages being predicted to occur in field so that the stability of waterproof dike could be assessed.

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Development of Waterproof Acoustic Sensor for Shockwave Measurement (탄환 충격파 측정용 방수 음향센서 개발)

  • Hur, Shin;Lee, Duck-Gyu
    • Journal of Sensor Science and Technology
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    • v.28 no.5
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    • pp.318-322
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    • 2019
  • In shooting training, an impact point identification system that uses the impact wave of the bullet to check the impact point in the target plate has been recently used. Acoustic sensors used in these systems must be able to detect shock waves of high sound pressure levels and be both waterproof and dustproof for rainy weather and dusty environments, respectively. In this study, membranes with excellent waterproof, dustproof, and sound transmitting characteristics were selected through a characteristics test; a protection cap was installed to install the selected materials. After coupling the produced protection cap to the acoustic sensor housing, the sensitivity and phase characteristics of the acoustic sensor were checked. Through the waterproof and dustproof test, the performances of its sensitivity and phase characteristics were confirmed. Finally, the normal shockwave of a 5.56 mm diameter bullet was measured using a shockwave detection signal collecting plate equipped with a prototype of the acoustic sensor at a 100 m firing range.

A Study on Improvement of the low temperature flex resistance test method about high waterproof materials (고기능성 투습방수 소재의 저온굴곡 시험방법 개선 연구)

  • Lee, Minhee;Moon, Sunjeong;Ko, Hyeji;Hong, Seongdon
    • Journal of the Korean Society for Quality Management
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    • v.46 no.3
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    • pp.425-440
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    • 2018
  • Purpose: This study is aimed at developing of the flex resistance testing process at low temperature with the waterproof fabric to suit the military environment, and is designed to fit for the purpose of the waterproof materials in order to optimize the test method by finding out matters to improve from existing the test method and through previous studies. Methods: The test method, which has been applied to flex resistance of existing water-repellent materials, was improved and consequently, differentiated test results could be obtained according to the test temperature, sample size, and flexing method. Results: The testing of the total of 8 samples revealed that performance of the military requirement could hardly be met just by presenting the materials or 2~3 layers when the quality criteria for high functional water repellent fabrics were applied. PTFE(Polytetrafluoroethylene) is preferred to PU(Polyurethane) to be used in the extremely low-temperature environment, but durability under the low-temperature environment may be varied depending on film thickness or laminating technique even if the materials of waterproof films are identical. Therefore, in addition to the material or texture, the test method capable of reflecting durability under the low-temperature environment shall be suggested, and the newly designed test method proposed in this study was shown to suggest differentiated quality criteria by the material. Conclusion: The water resistance measurement and the test method following flex resistance with expanded range of flex will enable the differentiable test of the samples according to the number of repetition. This study is meaningful in that it suggests a differentiable test method capable of establishing a basis of deciding suitable material when selecting military goods made of water repellent material by properly improving the test method.

Characteristics of Reservoir Behavior According to Establishment Range of Waterproof Mat During Overflow (차수매트 포설 범위에 따른 저수지 월류시 거동 특성)

  • Kim, Young-Ik;Lee, Ik-Sang;Choi, Don-Hwan;Im, Eun-Sang;Kim, Yong-Seong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.52 no.2
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    • pp.59-66
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    • 2010
  • This study was performed to develop the embankment protection method that can reduce demage by prevention of embankment loss and collapse from overflow due to heavy rain and flood. For overflow test, model dam was prepared and embankment behaviors were monitored with the established piezometer and strain meter during overflow. As a result of overflow test for model dam, in case of embankment without waterproof mat, the lower end of embankment was collapsed within 40 seconds after beginning of overflow. On the other hand, in case of embankment with waterproof mat, embankment collapse didn't occurred during overflow. Accordingly, establishment of waterproof mat for embankment showed that be absolutely effective for the embankment protection during overflow in reservoir. Also, it showed that the minimum establishment range of waterproof mat to prevent embankment collapse in reservoir is from maximum storage level to the lower end of embankment.

The Evaluation of Water Vapor Transport and Waterproofness Properties of the Waterproof and Breathable Fabrics (국내 시판 의류용 투습방수소재의 투습방수 성능평가)

  • Shim, Huen Sup
    • The Korean Journal of Community Living Science
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    • v.27 no.2
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    • pp.295-304
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    • 2016
  • This study was conducted to evaluate and compare the waterproofness and water vapor transport properties of 30 waterproof and breathable textiles in the market. MVTR upright cup test with water, MVTR inverted cup test with potassium acetate, and sweating hot plate test method were used for measuring the breathability of fabric samples. The waterproofness of all fabric samples and evaporative resistance of garment ensembles made with 5 selected waterproof and breathable textiles out of 30 samples were tested. The results of this study were as follows. The base fabrics of the most samples were basic weave structure with either polyester or nylon fiber. The waterproofness was over $5000mmH_2O$ for all the samples except densely woven fabrics. The evaporative resistance of garments that were made out of 5 fabric samples with a range of low to high breathability ranged $39.9{\sim}56.7m^2{\cdot}P{\cdot}W^{-1}$. The data of the water vapor transport properties of fabric samples varied with different test methods. Overall the bicomponent film fabrics showed better breathability and less standard deviation regardless of test methods. It is expected the breathability data without the information of test conditions used for marketing would confuse the consumers and the apparel manufacturers.

Effects of inorganic fluosilicate agent on the properties of concrete (규불화염계 혼화제가 콘크리트의 물성에 미치는 영향)

  • Lee, Sang-Ho;Moon, Han-Young
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.9 no.3
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    • pp.187-194
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    • 2005
  • This paper deals with a waterproof and mechanical feature of concrete using an inorganic self waterproof agent. The waterproof agents having been used in our country were a membrane agent, penetration agent and an organic waterproof agent. However, these agents have a lot of problems such as losing the effect of waterproof in the environment of lots of water, the difficulty of dispersion. For the clear of problems of these water -proof agents, we used the inorganic waterproof agent. This agent was made from inorganic fluosilicate. Generally, a waterproof agent has been used only for the waterproof effect. In this paper, however through the some tests of concrete using the inorganic self waterproof agent, we recognized that the concrete using the agent is more excellent in some peculiar properties than general concrete's properties. In this paper, we performed compressive strength, permeability, pore volume test, etc. As a result, the concrete of using the agent is more excellent in economy, waterproof, compressive strength.

A Study on the Performance Evaluation Method of Waterproofing-Seal as Leakage Cracks Repairing Material using on the Underground Structure (지붕용 톱코팅재의 내구성 향상에 관한 성능 및 평가방법에 관한 기초적 연구)

  • Park, Jin-Sang;Kang, Hyo-Jin;Oh, Sang-Keun
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.517-520
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    • 2006
  • The waterproofing of Building on the roof has been exposed more underground or the other part of waterproofing than environmental factor(solar heat, UV, salt, acid rain, wind, temperature, snow, rain, etc.) or physical factor. So it must be have a waterproofing performance and it has a special technique for the maintaining of concrete durability. Therefore, exposed waterproof layer has to protected from UV, solar heat, rain and the outside environment also, to endurance durability methods spread face plate topcoat material on the waterproof layer. But, actuality faceplate waterproof layer of topcoat materials are unbearable to UV, solar heat and moisture etc. and it doesn't have adhesion with waterproof layer in the middle. So it happens to crack, separating and heaving etc. Therefore, in the study, we will suggest that using of the exposed roof waterproof layer topcoat materials test method manage rooftop waterproof layer for the durability and the stability.

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A Study on the Properties of Concrete Mixed with Pozzolan Inorganic Polymer(PIP) Waterproof Admixture (인공 무기계 구체방수재를 혼입한 콘크리트의 물성에 관한 연구)

  • Chung, Jee-Seung;Shin, Hwa-Cheol;Kim, Jin-Gu
    • Journal of the Korean Society of Safety
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    • v.31 no.4
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    • pp.82-89
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    • 2016
  • In this paper, various of experiments were performed for checking the usefulness of Pozzolan Inorganic Polymer(PIP) Waterproof Admixture. The results of the experiment enabled to set the optimum mixture ratio of PIP waterproof admixture as 3.5%. Then, the test specimen mixed with PIP waterproof admixture was produced and consider whether meeting the quality standard of waterproofing admixture for concrete (KS F 4926) From the results, all the items such as mechanical properties and durability were meet the quality standard of KS. The PIP waterproof admixture concrete shows the high resistance of absorption, permeability and chloride ion penetration thanks to its internal components such as siliceous powder, zinc stearate and dispersive polymer.

Development of Waterproof Jacket Materials for Power Cables

  • Han, Yong-Huei;Jung, Jong-Wook;Kwon, Tae-Ho;Song, Hyun-Seok;Koo, Kyo-Sun;Han, Byung-Sung
    • KIEE International Transactions on Electrophysics and Applications
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    • v.3C no.4
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    • pp.146-154
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    • 2003
  • This paper describes various characteristics of the new compounds for cable jackets and model cables advanced in waterproof performance in order to essentially solve the problems of underground (URD) distribution class power cable failures. Several compounds were manufactured by the inclusion of additives to base resins available in Korea and tested for basic property, mechanical and electrical characteristics. Two model cables were created by using the compounds determined in the test as being the most appropriate for new structured model cable jacket material. The waterproof performance and mechanical strength of the new cable jackets were verified by applicable tests. As a result, MDPE and LLDPE compounds were superior as cable jackets in both mechanical and electrical characteristic aspects when compared with conventional PVC. In addition, the model cables composed of the new compounds based on MDPE showed good quality results in the water permeability test.