• Title/Summary/Keyword: Surface Construction

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Development of Water-repellent Cement Mortar by using Silane Enriched with Nanomaterials

  • lee, Han seung;Park, Dong-jin;Lee, Yunsu;Karthick, Subbiah
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.05a
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    • pp.193-194
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    • 2018
  • Tn this present study, the superhydrophobic surface was developed on the cement mortar surface by using water repellent materials. For better superhydropohicity, it was developed by using silane as binder and which was enriched with filler materials of SiO2 and TiO2 nanomaterials. Those nanomaterials enriched with silanes were admixed in cement mortar during casting time and another was coated on the cement mortar surface. The water repellent properties of spray coated and admixed cement mortars were evaluated by measuring the contact angle which was compared with normal cement mortar.

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Effect of the Kind of Surface-Covered Curing Materials on the Temperature of Concrete in Hot Weather (서중환경에서 표면피복 양생재 종류가 콘크리트의 온도에 미치는 영향)

  • Lee, Je-Hyun;Kim, Min-Sang;Moon, Byeong-Yong;Lee, Sang-Un;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.11a
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    • pp.173-174
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    • 2017
  • Although the application period of hot weather concrete in our country is two months of July~August which is relatively short, many problems in various aspects such as generation of plastic/dry contraction cracks and cold joints can be caused unless proper quality control measures are established at this time. Therefore, this study compared the temperature history of the placed concrete by applying a mono white and aluminum-deposited bubble sheet developed with surface coating curing materials for surface exposure and summer to an actually constructed apartment slab. The analysis result showed that the mono white bubble sheet is the best method.

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Analysis of Surface Heat Characteristics by Decoration Wood-based Wood Flooring Board (치장목질마루판 종류별 표면열전달성 분석)

  • Park, Cheul-Woo;Lim, Nam-Gi
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.11a
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    • pp.171-172
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    • 2017
  • There is some recognition that Decoration Wood-based Flooring Board in Korea is a material that inhibits the heat transfer from the substrate to the room. There is a lack of substantial research literature on the surface heat transfer and condition of Decoration Wood-based Flooring Board, which is insufficient to deal with false perceptions. In this study, the purpose of this study is to analyze the surface heat transfer characteristics of Decoration Wood-based Flooring Board and to obtain basic data to cope with recognition.

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Crack Properties of Concrete depending on Changes in Surface-Covered Curing Materials in Hot Weather (서중환경에서 표면피복 양생재 변화에 따른 콘크리트의 균열특성)

  • Lee, Je-Hyun;Kim, Tae-Woo;Baek, Cheol;Lee, Sang-Un;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.11a
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    • pp.175-176
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    • 2017
  • Many problems in various aspects such as generation of plastic/dry contraction cracks and cold joints can be caused unless proper quality control measures are established in hot weather circumstances. Therefore, this study aimed to compare the crack patterns of concrete by applying a change in 3 surface curing methods such as a mono aluminum-deposited bubble sheet developed to reduce the temperature and cracks through reflection of heat in summer and a PE film and a surface exposure used generally to an actually constructed apartment slab. The study result confirmed that the best concrete crack reduction effect can be obtained with a mono aluminum-deposited bubble sheet.

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Effect of Surface Modification of Waste Glass for Fine Aggregate on the Mechanical Properties and Alkali Silica Reaction of Mortar (잔골재용 폐유리의 표면개질이 모르타르의 역학적 특성 및 알칼리 실리카 반응에 미치는 영향)

  • Son, Min-Jae;Kim, Gyu-Yong;Lee, Sang-Kyu;Sasui, Sasui;Eu, Ha-Min;Nam, Jeong-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.11a
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    • pp.23-24
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    • 2020
  • In this study, effect of surface modification of waste glass for fine aggregates on the mechanical properties and alkali silica reaction of mortar was analyzed. As a result, it was confirmed that the incorporation of waste glass fine aggregate decreases the mechanical properties of the mortar and increase the alkali silica reaction expansion. On the other hand, the surface modification of the waste glass fine aggregate is effective in improving this problem. However, unlike green and brown waste glass, it is judged that an additional experiment to determine the cause is necessary for white waste glass where alkali silica reactive expansion occurs extremely.

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A Study on the Estimation of Setting Time for High Strength Concrete Using Durometer (개량형 Durometer를 이용한 고강도 콘크리트의 응결시간 추정 가능성 분석)

  • Sin, Se-Jun;Han, Soo-Hwan;Hyun, Seung-Yong;Kim, Jong;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.11a
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    • pp.87-88
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    • 2020
  • The purpose of this study is to explore the possibility of estimating optimum surface finish time of the fresh concrete placed at the job site by applying a surface hardness test meter(Durometer). Tests are carried out by measuring and comparing the Penetration resistance test and hardness test by Durometer. Penetration resistance tester and improved Durometer are similar, but the higher the temperature, the higher the setting time, and the higher the correlation was shown. When the hardness value of the improved Durometer is about 50 HD, it is found that the initial and 80 HD represent the end. It is expected that this will be useful in determining the finish time of the surface at the actual site.

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An Evaluation of Physical Properties of Metal Sprayed Coating According to Concrete Surface Treatment Methods (콘크리트 표면 처리 방법에 따른 금속 용사 피막의 물리적 특성 평가)

  • Jang, Jong-Min;Jang, Hyun O;Lee, Han-Seung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.05a
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    • pp.67-68
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    • 2021
  • Social infrastructure facilities can be destroyed instantly when exposed to EMP (ElectroMagnetic Pulse), causing social chaos. However, concrete structures with low electrical conductivity cannot expect EMP shielding effect. Therefore, in this study, a metal sprayed thin film showing excellent EMP shielding performance was applied to a concrete structure to evaluate the metal spray welding efficiency and adhesion performance of the thin film according to the concrete surface treatment method. As a result according to the concrete surface treatment method, It was confirmed that the use of a roughening agent that generates physical irregularities in order to improve the welding efficiency and adhesion performance increases the physical performance of the concrete and metal sprayed thin film.

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A Study on the Estimation of Setting Time for Concrete Using Durometer (개량형 Durometer를 이용한 콘크리트의 응결시간 추정 가능성 분석)

  • Sin, Se-Jun;Han, Soo-Hwan;Hyun, Seung-Yong;Kim, Jong;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.11a
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    • pp.169-170
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    • 2020
  • The purpose of this study is to explore the possibility of estimating optimum surface finish time of the fresh concrete placed at the job site by applying a surface hardness test meter(Durometer). Tests are carried out by measuring and comparing the Penetration resistance test and hardness test by Durometer. Penetration resistance tester and improved Durometer are similar, but the higher the temperature, the higher the setting time, and the higher the correlation was shown. When the hardness value of the improved Durometer is about 50 HD, it is found that the initial and 80 HD represent the end. It is expected that this will be useful in determining the finish time of the surface at the actual site.

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A Study on the Evaluation of Carbonation Resistance of Fire Damaged Fiber-Reinforced High Strength Concrete with the Type of Surface Repair Materials (섬유혼입 고강도 콘크리트의 화재 후 표면보수재료의 종류에 따른 중성화 저항성 비교·평가에 관한 연구)

  • Sim, Sang-Rak;Ryu, Dong-Woo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.06a
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    • pp.81-82
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    • 2020
  • In this study, after applying a silicate-based impregnation and polymer-based coating to fire damaged high strength concrete, carbonation resistance was evaluated to compare and evaluate the carbonation depth according to the type of surface repair materials. As a result of the experiment, it was confirmed that the carbonation resistance was increased in the case of the concrete with the surface repair materials compared to the control specimen without the surface repair materials. In particular, in the case of the polymer-based coating agent, it was confirmed that the carbonation hardly progressed.

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The Effects of Surface Coating Material for Aluminum Form on Surface Quality of the Concrete (알루미늄 거푸집 표면코팅재가 콘크리트 표면품질에 미치는 영향)

  • Han, Cheon-Goo;Park, Jae-Soon
    • Journal of the Korea Institute of Building Construction
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    • v.10 no.3
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    • pp.57-64
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    • 2010
  • This study is to analyze the effects of aluminum form surface coating material on surface quality of concrete. When observing the surface quality of concrete affected by the change of aluminum form surface coating material, in general, as the number of use of the coating material increased, the surface quality of concrete decreased and good surface quality was shown in plywood (hereinafter PW). For epoxy (hereinafter EP) resin, when applying form remover, good surface quality was shown. For the surface roughness of concrete by the application form oil of form remover and the number of use of the coating material, as the number of use increased, highest surface roughness value was shown which meant the leveling was bad, but the surface roughness value in EP and PW was the lowest. Just for EP, when applying form remover, surface roughness value was low. For the number of void for concrete by the application of form remover and the number of use of the coating material, In general, the number of void which was generated when applying form oil the remover decreased.