• Title/Summary/Keyword: Waterproofing Admixture

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A Trend on Quality Transformation of Waterproof Agent and Admixture of Cement for Concrete Surface Treatment (콘크리트 표면처리용 시멘트 액체방수제의 품질동향)

  • 최은수;김영근;박헌일;정순자
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.11a
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    • pp.557-560
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    • 2003
  • This study deals with the method of test for waterproof agent and admixture of cement, and especially, the effect on bond strength between waterproofing layer and mortar or concrete substrate in building construction. Quality of that has been managed according to it of construction standard manual, housing construction manual, 건, and Q until performance of that is specified by law as KS F 4923. Therefore this study focus on the quality and trend for a fatty system and PCM(Polymer Cement Mortar)

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A Study on the Guide Line of Quality of Waterproofing Admixture of Powder Type for Concrete (콘크리트 혼입용 분말형 구체방수재의 품질기준에 관한 연구)

  • 우영제;배기선;오상근;김형무
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10b
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    • pp.967-974
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    • 2000
  • By testing compressive strength, water absorption and water premeablity, to establish the standard of quality of waterproofing admixture of power type for concrete, we propose guide line as following ; $.$Setting time: more than 1 hour, within 10 hours $.$Slump: To be satisfied with request of user $.$Air content: To be satisfied with request of user $.$Safety: Without crack or deformation $.$Ratio of compressive strength: $\circled1$ At 3 days : more than plain specimen by 0.9 (An inorganic material) more than plain specimen by 0.4 (An inorganic material mixed organic) $\circled2$ At 7, 28 days : more than plain specimen by 1.0 $.$Ratio of water absorption Coefficient: $\circled1$An inorganic material: less than plain specimen by 1.0 $\circled2$ An inorganic material mixed organic : under than plain specimen by 0.8 $.$Ratio of water premeablity : $\circled1$ An inorganic material : less than plain specimen by 1.0 $\circled2$ An inorganic material mixed organic : under than plain specimen by 0.8

A Study on Influences of Waterproofing Admixtures for Concrete on Self-Healing Properties of Hardened Cement Paste (시멘트페이스트 경화체의 Self-Healing 특성에 미치는 구체방수재의 영향)

  • Kim, Jae-Young;Byun, Seung-Ho;Ma, Sang-Jun
    • Journal of the Korea Concrete Institute
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    • v.20 no.1
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    • pp.109-116
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    • 2008
  • This study was performed to get information of self-healing mechanism in cement system and the influence of waterproofing admixtures for concrete on self-healing property. For testing, cement paste specimens cured for 7, 14 and 28 days were prepared and crushed into plate-shape pieces. Screened specimens with thickness not more than 1mm were covered with wet rags and cured in a plastic container for 7 and 28 days. After stopping hydration process of the specimens by treatment with acetone, the surfaces of specimens have been contacted with wet rags were analyzed by XRD, DSC, SEM and EDX. The analysis results showed that cement paste has self-healing property and this property is mainly affected by water. Self-healing in cement system is more effective and faster at an early stage of hydration as there is enough content of unreacted cement to make an additional hydration in this period. The results of this study also showed that waterproofing admixtures for concrete have a considerable effect on self-healing of cement pastes; i.e., they improved self-healing effect of cement and, especially, the specimen using admixture C has shown a lot of needle-like or fibrous hydration products which are estimated as ettringite. It is supposed that these ettringite products are effective to enhance self-healing in cement system.

The Leakage Reduction of Natural Inorganic Powder Compound Applying Subsurface Structural Weak Part (지하구조물 취약부에 적용한 천연 무기질계 분말형 혼화제의 누수저감효과)

  • Yoon, Sung-Hwan;Seo, Hyun-Jae;Lee, Hye-Ryung;Park, Jin-Sang;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.05a
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    • pp.19-22
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    • 2011
  • For underground structures that are exposed to environmental conditions, the declination of the durability of concrete occurs easily because of leakages from high hydraulic pressure and the frequent contact of water due to environmental factors. Therefore this study is to confirm that the leakage reduction of natural inorgnic powder compound applying subsurface structural weak part and make the performance improvement of concrete as an objective. The test was done by making the rebar, flat tie, nail and film infiltration and each of its water tank and cylindrical test body then after pouring water to each of the test body, the test observe the change of the water tank surface absorbed condition and leakage of each specimen with respect to time. As a conclusion, the test was observed that this water proofing admixture has better watertightness from the beginning of the setting time(when it hardens), the ettringite and the thaumasite generates a large quantity of hydration products that controls the formation in a large opening and the CSH produced by pozzolan reaction makes a dent at this opening.

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Study on the Waterproofing Performance of FGD Gypsum Building Products from Inorganic-Organic Composite Additives

  • Ding, Yi;Fang, Youchun;Ren, Qifang;Fang, Hui;Zhang, Qicai;Oh, Won-Chun
    • Korean Journal of Materials Research
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    • v.25 no.11
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    • pp.590-597
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    • 2015
  • In this article, poly methyl triethoxy silane was compounded with an inorganic waterproof admixture at a certain ratio to improve the performance of gypsum products; a new type of high-efficiency compound water-proofing additive was also investigated. Furthermore, the waterproof mechanism and the various properties on the hardened gypsum plaster were investigated in detail by XRD and SEM. The results show that the intenerate coefficient of gypsum plaster increased to more than 0.9; the water absorbing rate decreased to less than 10 %. Both the bending strength and the compressive strength of gypsum plaster increased by various degrees. The intenerate coefficient reached a maximum value of 0.73 and the strength of the samples showed almost no change when 5% cement alone was added. In this new type of the high-efficiency compound with waterproof additive, the optimal technological parameters for formulas were obtained to be: 5% cement, 18 % mineral powder, and 0.8% poly methyl triethoxy silane, to compound gypsum plaster. Meanwhile, the production of high performance gypsum as a building material has become possible.