• Title/Summary/Keyword: Bubble Sheet

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Temperature History of Concrete at Cold Weather Depending on the Kinds of Insulating Sheet (단열양생시트 종류 변화에 따른 한중콘크리트의 온도이력)

  • Jeon, Chung-Keun;Kim, Jong;Shin, Dong-An;Oh, Seon-Kyo;Han, Cheon-Goo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05a
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    • pp.618-621
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    • 2006
  • This paper is to investigate temperature history of cold weather concrete depending on insulation curing sheet kinds. Insulating effect according to curing sheet is shown in order of 5 layer bubble sheet, combination of PE form and 3 layer bubble sheet and 3 layer bubble sheet. It maintained above $10^{\circ}C$ of minimum temperature until the completion of initial curing period when bubble curing sheet was supplied regardless of curing sheet kinds. Five layer bubble curing sheet secure higher curing temperature than any other curing sheet applied in this experiment by as much as $2{\sim}3^{\circ}C$, which performed remarkable insulation effect. Concrete applied with curing sheet secured above $65^{\circ}D{\cdot}D$ of maturity, at which concrete had 5MPa of compressive strength at 3 days.

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Field Application to Evaluate the Effect of Various Surface Covered Curing Blankets on Temperature Profile and Crack Occurrence of the Concrete under Hot Weather Condition (서중환경에서 표면피복 양생재 종류변화가 콘크리트의 초기 온도이력 및 균열발생에 미치는 영향에 관한 현장적용성 평가)

  • Han, Min-Cheol;Lee, Sang-Woon
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.34 no.5
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    • pp.27-34
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    • 2018
  • Concrete placed under hot weather condition suffers from larger slump loss, rapid moisture evaporation due to high air temperature. Proper measures for material, transportation and curing should be taken to prevent the quality deterioration of the concrete under hot weather condition. In Korea, Although the period of hot weather concrete in Korea occupies only 2 months, there are a lot of quality problems including plastic, drying shrinkage and cold joint. Therefore, the objective of this paper is to investigate and compare the temperature history and crack occurrence of the concrete, which was placed in the actual apartment house construction field under hot weather condition, in response to the application of surface covered curing blankets including PE film, single layer clear bubble sheet, white colored bubble sheet and aluminum metalized bubble sheet. Test results indicated that the application of white colored bubble sheet and aluminum metalized bubble sheet showed most favorable results in terms of reduction in temperature rise and crack occurrence as well as easiness in handling. But, due to light reflection by aluminum metalized bubble sheet, it is believed that white colored bubble sheet is preferable.

Temperature History of Slab Concrete Depending on Insulation Curing Method in Cold Weather Concreting (한중시공시 단열양생방법 변화에 따른 슬래브 콘크리트의 온도이력 특성)

  • Kim Jong-Back;Lim Choon-Goun;Park Koo-Byoung;Kim Seoung-Soo;Han Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2005.05a
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    • pp.17-20
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    • 2005
  • This paper reported the temperature history of concrete placed at deck plate slab under cold climate condition by varying with surface insulating type. No curing sheet and simple insulation curing including non-woven fabric, double layer bubble sheet, the combination of double layer bubble sheet and non-woven fabric dropped temperature below zero within 24 hours, which caused frost damage at early age. On the other hand, the combination of double layer bubble sheet and non-woven fabric and double layer bubble sheet and styrofoam maintained minimum temperature above $4^{\circ}C\;and\;8^{\circ}C$, respectively. Based on core test results compressive strength of concrete with the combination of double layer bubble sheet and non-woven fabric and double layer bubble sheet and styrofoam was higher than those with other curing method due to good insulation effect.

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Curing Temperature of Concrete Using Bubble Sheet with Carbon-based Photothermal Materials (탄소계 광발열 소재 혼입 버블시트를 적용한 콘크리트의 양생온도 특성)

  • Lee, Seung-Min;Lee, Hyeon-Jik;Baek, Sung-Jin;Han, Jun-Hui;Kim, Jong;Han, Min-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.11a
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    • pp.45-46
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    • 2023
  • This study examined the curing temperature of concrete with a photothermal insulation sheet to shorten the curing time of concrete as part of construction cost and period reduction. According to the experiment results, the heating performance effect is confirmed through the temperature difference between photothermal insulation sheet and bubble sheet. And it has a high curing temperature in the order of bubble sheet (photo heating material B) > bubble sheet (photo heating material A) > bubble sheet on same layers.

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Temperature History of the Concrete for Retaining Wall Insulated with Double Layered Bubble Sheet in Summer (서중기 2중버블시트로 단열처리된 옹벽의 온도이력 특성)

  • Jung, Eun-Bong;Kim, Kyung-Hun;Jang, Deok-Bae;Kyung, Yeong-Hyeok;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2012.11a
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    • pp.45-46
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    • 2012
  • This study is intended to use the insulation effect of the dual bubble sheet to review the freezing prevention capability of underground walls by pouring the dual bubble sheet on the retaining walls before the concrete pouring to contemplate the temperature profile for each area of installation and the area of non-installation of the dual bubble sheet, and as a result, the temperature of the concrete was heightened than the ground due to the insulation effect in using the bubble sheet.

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Performance of Heat Insulation Capability of the Concrete Applying Light Heat Generating Sheet (광발열 단열시트를 적용한콘크리트의 특성 )

  • Lee, Hyeon-Jik;Baek, Sung-Jin;Lee, Seung-Min;Lim, Gun-Su;Kim, Jong;Han, Min-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.05a
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    • pp.169-170
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    • 2023
  • In this study, light-heat generating materials were produced in two ways, and the performance of two light-generating insulation sheets was reviewed. As a result of the experiment, it was possible to confirm the improved heating performance of the light heating insulation sheet compared to the existing bubble sheet. The light heat insulation sheet (b) showed improved thermal properties compared to the existing bubble sheet, and it is believed that the temperature has increased due to the combined effect of initial hydration heat and heat generation after installation. In future studies additional experiments are needed to compensate for the insufficient insulation performance due to the single bubble sheet through the double bubble sheet and to adjust the amount of light-generating materials added as a consideration of the optimal heat-generating effect of the light-generating insulation sheet (b).

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Effect of Water Presence in Double Layer Bubble Sheet on Heat Insulation Capability in Cold Weather (이중버블시트의 함수상태가 단열보온 효과에 미치는 영향에 대한 특성분석)

  • Baek, Dae-Hyun;Hong, Seak-Min;Son, Ho-Jung;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2010.05a
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    • pp.445-446
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    • 2010
  • Water existed inside of bubble sheet applied at the job site sometimes results in undesirable heat insulation capability of bubble sheet. Therefore, the objective of this paper is to examine experimentally the effect of water presence in bubble sheet on heat insulation capability and strength of the concrete cured with double bubble sheet.

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Effect of the Kind of Modified Bubble Sheets on the Temperature Profiles and Crack Reduction of the Concrete under Hot Weather (표면개량 버블시트 종류 변화가 서중환경 콘크리트의 온도 및 균열발생에 미치는 영향)

  • Lee, Sang-Woon;Han, Min-Cheol
    • Journal of the Korea Institute of Building Construction
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    • v.18 no.3
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    • pp.251-257
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    • 2018
  • There are various quality deteriorations of concrete such as plastic, drying shrinkage due to abrupt moisture evaporation, slump loss and cold joint under hot weather condition. To protect from above deteriorations, several kinds of modified bubble sheets have been applied to secure heat insulation performance. But, there is not enough application cases of bubble sheets at job site under hot weather condition. The objective of the paper is to investigate the temperature profile and crack occurrence of the concrete covered with five different kinds of surface curing sheets, which is placed under hot weather condition. Single layer transparent bubble sheet, white colored bubble sheet, aluminum metalizing bubble sheet and PE film are adopted for surface curing sheets. Test results indicated that application of aluminum metalizing bubble sheet had most favorable effect on the reduction of on temperature rise and on the crack reduction of concrete. But due to larger reflection of light by aluminum, it brings about visual pollution to the workers. Hence, the application of white colored bubble sheet can be the most desirable alternative to protect the concrete from hot weather in the field.

A Study on the Heat Performance of Single Layered Bubble Sheet Using Phothothermal Materials (광발열 소재를 활용한 1중 버블시트의 발열성능 검토)

  • Lee, Hyeon-Jik;Hu, Yun-Yao;Lee, Seung-Min;Han, Jun-Hui;Kin, Jong;Han, Min-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.11a
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    • pp.223-224
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    • 2023
  • This study compared the curing temperature of the bubble sheet and the photothermal insulation sheet incorporating carbon-based photothermal materials to reduce concrete curing time as a part of shortening construction period. As a result of the experiment, bubble sheet with photothermal material B is judged to be effective in shortening the curing time under hot environment.

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Temperature Properties of Vertical Reinforcements in Wall Structures in Relation to the Different Methods of Bubble Sheet Installation in Winter (겨울철 버블시트 포설방법 변화에 따른 벽식구조 수직철근의 온도 특성)

  • Kim, Tae-Woo;Lee, Jea-Hyeon;Kyung, Yeong-Hyeok;Lee, Jong-Gyo;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.11-12
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    • 2017
  • This study aims to analyze the properties of the temperature change in vertical reinforcements in outdoor wall structures in winter in relation to the different methods of bubble sheet installation, and to subsequently determine the possibility of initial frost damage to the concrete as a result of low temperature. As for the experimental variables, double bubble sheets were used as curing materials, and the curing method was to model the part where the slab and the wall intersect and the rebar is exposed, and to measure the change of temperature around the exposed rebar in accordance with the change of the coating curing. It was found that by employing curing method B, which is to install the bubble sheet between the vertical reinforcements, the most vulnerable area, which is 50mm below(④) the surface of the concrete, would be lowered to sub-zero temperature 20 hours later than when using curing method A, and that therefore it is more effective to install the bubble sheet between the vertical reinforcements for the prevention of initial frost damage.

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