• Title/Summary/Keyword: waterproof

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Improvement of Waterproof Effect for Speaker Enclosure (스피커 인클로저 방수효과 개선)

  • Kim, Han-Kil;Kim, Yong-Pil;Wujing, Wujing;Kim, Chang-Su;Jung, Hoe-Kyung
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2012.10a
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    • pp.594-596
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    • 2012
  • Currently, demands for outdoor broadcasts and concerts are increasing. Due to severe circumstance of outdoor places like rain, wet-damage in moved loudspeaker may occur. Experimental approaches to improve waterproof-effect for movable loud speaker have been investigated in this studies. For performance test of loud speaker, enclosures were made by MDF(Medium Density Fiberboard). Three types of finishing material, general paint, sheet paper and FRP(Fiber Reinforced Plastics) are proposed for comparing waterproof-effects.

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A Study on the Joint Performance Change of Self-Admixed Waterproofing Sheet by Induced Bonding of Asphalt Compound (아스팔트 컴파운드 간 접합을 유도한 자착식 방수 시트의 시트 간 접합부 성능 변화 연구)

  • Kim, Dong-Bum;Kim, Sun-Do;Park, Jin-Sang;Ko, Sam Seog;Kim, Byoung-Il;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.234-235
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    • 2017
  • The bonding of the asphalt-based waterproof sheet is carried out in such a manner that the sheet and the sheet are adhered together and the lower adhesive layer of one sheet is adhered to the upper film layer of the other sheet, and the asphalt layer and the PE or HDPE film layer are bonded. When the joints are formed in the form of junctions between heterogeneous materials and exposed to the concrete joint movements and other deteriorating factors, the integrity of the joints can deteriorate and problems such as lifting and peeling off of the joints can occur. Therefore, this study was carried out to prevent unstable joint adhesion of the asphalt compound and film layer and to prevent defects in the adhesion between self - adhesive waterproof sheets. The self-adhesive waterproof sheet of this study can maximize bond stability by inducing bond between asphalt compounds during sheet-to-sheet bonding, thereby improving bonding strength.

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A numerical study on the waterproofing effect of Fan Grouting under tunnel excavation (터널 굴착 중 Fan Grouting의 차수 효과에 관한 수치해석적 연구)

  • Moon, Hoon-Ki;Park, Gyung-Wook;Lee, Hyeyoon;Kwon, Seok-Hun
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.21 no.2
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    • pp.257-266
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    • 2019
  • Ground water generated under tunnel excavation has a major impact on tunnel construction and stability. Thus, effective waterproof grouting is needed to reduce the inflow of groundwater. Most tunnel designs are applying the Pre Grouting. However there are no propriety analysis for grouting material and waterproof effect. In this study, numerical analysis was performed in order to investigate the effect of waterproof with decrease of coefficient of permeability of the grouting area based on the case of grouting construction.

Evaluation of Thermal Insulation Properties of Covering Materials to Protect Peach Trunks against Freezing Injury (복숭아 주간부 동해 예방을 위한 피복재의 보온성 평가)

  • Shin, Hyunsuk;Yun, Seok Kyu;Choi, In Myung;Kim, Sung Jong;Yun, Ik Koo;Nam, Eun Young;Kwon, Jung Hyun
    • Journal of Bio-Environment Control
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    • v.25 no.4
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    • pp.288-293
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    • 2016
  • The study was performed to evaluate thermal insulation covering materials (TICMs) to protect peach trunks against freezing temperatures in winter season by investigating thermo-physical properties and practical thermal insulation effect of the TICMs which was made of white non-woven fabrics, yellow paper sheets, and waterproof fabric pads. Among the three TICMs, Waterproof fabric pad (double layer) possessed the best performance about thermal insulation rate and thermal resistance among three kinds of TICMs. Day thermal insulation effects of waterproof fabric pad, which prevent from temperature rise on the bark tissues of trunks during the day time, were $14.09^{\circ}C$. Night thermal insulation effects of them, which prevent from temperature decline on the bark tissues of trunks at night time, were $7.23^{\circ}C$. Waterproof fabric pad showed the highest day and night thermal insulation effects. Thus our results suggest that development of TICMs using waterproof fabric pad might be helpful to protect the bark tissues of trunks from freezing injury.

Performance analysis of waterproofing corrosion as effecting oil (유류성분이 지하구조물의 방수층 침식에 미치는 영향평가)

  • 김영찬;이정윤;권시원;오상근
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2004.05a
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    • pp.91-95
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    • 2004
  • Utilization of underground construction if increased by the large size & skycraperlization of building recently. Therefore. waterproof dependence of underground construction is risen. However, water leakage was happened by rupture by concrete conduct, drying shrinkage. form tie. In underground environment soil class, degradation of waterproofing is showing to corrode by oil. An odious smell by oil, promotion evil of reinforcing rod corrosion, declination of durability can happen. Then, practical un degree of underground spare becomes low, Because oil or water permeates by construction by degradation to waterproof class corrode by oil, is considered to affect evil durability of construction.

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Evaluation of Performance of Adhesion and Waterproof Using Polymer-portland-cement Concrete (PPCC(Polymer-portland-cement concrete)를 이용한 방수 및 부착 성능 평가)

  • Kim, Kyung-Hwan;Park, Mi-Yun;Chung, Won-Yong;Moon, Jae-Woo;Jang, Seung-Yup
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.3172-3179
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    • 2011
  • Several materials using polymer-portland-cement concrete have developed to have not only strength of attachment with body, but also waterproof function and strong anti-sodium chloride properties. Especially, in case of railway, unlike other public transportation, it is very difficult to doing the repair and reinforcement work of structure during service time. Therefore, the development and study of materials having characteristics of structural strength, unification behavior with body, and resistance of crack are very important. Accordingly, the characteristic of material of polymer based concrete is indicated compared with the experiment and analysis through this study, and suggested application to railway tunnel, bridge, and concrete track structure.

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Crack obeying ability of coating material and Increasing in fatigue life of coated marine concrete (콘크리트용 코팅재의 구열추종성과 그 적용에 의한 해양콘크리트 구조의 피로수명 증가)

  • 사림신장;정상정일;권혁문;송하행의;태야지사
    • Proceedings of the Korea Concrete Institute Conference
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    • 1992.10a
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    • pp.131-134
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    • 1992
  • This paper deals with the obeying ability to the crack of waterproof membrane (produced from polybutadiene- or epoxy type resine) under static and repetitive loading, and an increase in fatigue life of marine concrete structure by applying the waterproof membrane. From experimental results, it is cleared that the obeying ability for crack under repetitive loading is smaller than that under static loading. With regard to fatigue life, the use of membrane possessed large obeying performance under repetitive loading results in significantly increase in fatigue life of marine concrete structure

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A study on a performance the appliable rubber asphalt of monolithic waterproofing material of construction quality and the cement polymer modified waterproof coating membrane material of surface treatment. (무기질계 탄성 도막재와 고무 아스팔트를 적층한 일체형 방수재의 시공특성에 관한 실험적 연구)

  • Park Jin-Sang;Choi Sung-Min;Park Young-Tea;Oh Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2005.05a
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    • pp.223-226
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    • 2005
  • In this study on the appliable Asphalt sheet of monolithic and inorganic matter waterproofing ,Fing material using of field because of problem of complex waterproofing sheet. Before this cement polymer modified waterproof coating and appliable asphalt sheet of monolithic whether have stability by method of construction about all style waterproofing that evaluate to new method of construction development naturally big emphasis put and try to approach. Did performance test item first at, as a result, drew by suitable thing in all KS items. This is considered to have more effective spot construction work because if means that have stability by material as well as method of construction.

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A Study on the Waterproof Properties of Cement Mortar with the Addition Rate of the Inorganic Admixture and Zinc Stearate (무기질 혼화재 및 금속비누의 혼입률 변화에 따른 시멘트 모르터의 방수 특성에 관한 연구)

  • Choi, Hoon;Jiang, Yi-Long;Han, Min-Cheol;Ryu, Hyun-Ki;Han, Cheon-Goo
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.10c
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    • pp.139-144
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    • 1998
  • This study is intended to devolop the self waterproof agents for high performance concrete by analyzing the properties of fresh and hardened mortar with various addition ratios of the inorganic admixture and zinc stearate. As the results of the test, the flow and air content increase with the addition of expansive additives. When the replacement rate of silica fume increases, the flow decreases for the increased viscidity. And the flow and sir content decrease with the addition of zinc stearate. At hardened state, the compressive strength, tensile strength and flexual strength decrease with the addition of expansive additives and zinc stearate. With the increase of silica fume's replacement, they show a little decrease at early age and then increase gradually. Also, absorption and permeability show a steep decrease when zinc stearate is added, and a slack decrease with the replacement of silica fume.

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