• Title/Summary/Keyword: 2중 버블시트

Search Result 12, Processing Time 0.028 seconds

Insulation Effect of Double Layered Bubble Sheet Application in Cold Weather Concrete and Initial Quality Control by Wireless Sensor Network (한중시공에서 2중 버블시트 포설에 따른 단열 효과분석 및 무선센서 네트워크에 의한 초기 품질관리)

  • Han, Min-Cheol;Seo, Hang-Goo
    • Journal of the Korea Institute of Building Construction
    • /
    • v.21 no.1
    • /
    • pp.21-29
    • /
    • 2021
  • The objective of this study is to evaluate the effect of the application of double layered bubble sheet on the curing of slab and wall concrete placed at the job site in cold weather and to offer a feasibility of Concrete IoT Management System(CIMS), which is wireless sensor network developed by the authors, to manage early age quality of the concrete in terms of temperature, maturity and strength development. Test results indicated that the application of bubble sheet enhances the insulation performance, which results in an increase of the temperature by around 1~20. 6℃. It is found that CIMS can gather the temperature, maturity and strength development data from the sensors embedded from 30 m far from CIMS successfully. Predicted compressive strengths by CIMS had good agreement with measured ones within 2 MPa error level until 7 days. It is thought that the combination of the bubble sheet application for cold weather protection and CIMS for quality management tool in cold weather concreting contributes to shorten the time for the form removal by one day.

Influence of Bubble Sheet Applying Methods on Temperature of Exposed Joint Rebar at Wall Surface of Load-Bearing Wall Structure Building During Winter (동절기 벽식구조 건축물 벽부분의 버블시트 포설방법 변화가 이음부 노출철근의 온도에 미치는 영향)

  • Han, Cheon-Goo;Lee, Jea-Hyeon;Kim, Min-Sang
    • Journal of the Korea Institute of Building Construction
    • /
    • v.17 no.2
    • /
    • pp.149-155
    • /
    • 2017
  • In this research, the surface covered curing method using the double-layered bubble sheet was evaluated. This double-layered bubble sheet has outstanding insulating performance with its low heat conductivity and high economic feasibility with its high durability. However, in the case of wall-typed building construction, the area of exposed rebar is curious on curing performance with the double-layered bubble sheet in spite of the double-layered bubble sheet showed favorable performance for slab. Therefore, in this research, regarding the actually constructed wall-typed apartment building, the most efficient curing method was suggested based on the evaluation of curing performance depending on temperature distribution depending on various location of covered or exposed rebar. As a result, the D method was determined as the most efficient curing method without any concern of early-age frost damage. However, by considering easiness of construction, the B method of covering the pieced double-layered bubble sheet on gap between rebars can be another option of desired result.

Field Construction Applying the Insulating Method of Moderate-Cold Weather Concreting Using Double Bubble Sheets (2중 버블시트를 이용한 한랭기 콘크리트의 단열양생공법 현장적용)

  • Kim, Jong;Kim, Jong-Back;Jeon, Chung-Keun;Shin, Dong-An;Oh, Seon-Gyo;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2006.11a
    • /
    • pp.29-32
    • /
    • 2006
  • Experimental test results of field construction, Cheongju University Educational Liberal Art Building, applying the insulating curing method on slab concrete showed that the quality of concrete in fresh and hardened state satisfied all target values. Temperature history of slab concrete in A and B area secured more than $7.8{\sim}9.2^{\circ}C$ higher than outside atmosphere. After completing certain curing period of time on the surface of the structure, crack occurrence was not found. It is concluded that the preventing vaporization of moisture by the insulating curing method reduces plastic and drying shrinkage as welt as improves durability.

  • PDF

Field Application of the Concrete with the Combination of Drying Shrinkage-Reducing Superplasticizer and Double Layer Bubble Sheet (건조수축 저감형 유동화제 및 2 중 버블시트를 사용한 콘크리트의 현장적용)

  • Han, Cheon-Goo;Oh, Chi-Hyun;Shin, Jae-Kyung
    • Journal of the Korea Institute of Building Construction
    • /
    • v.7 no.1 s.23
    • /
    • pp.107-113
    • /
    • 2007
  • This study investigates the filed application in Daebul Free Trade Zone applying both a flowing method using drying shrinkage-reducing superplasticizer(SRS) and an insulating curing method using double layer bubble sheet. Test results showed that fresh concrete satisfied target slump and air content. A structure adding SRS significantly decreased the total bleeding capacity and accelerated the setting time. As for the crack occurrence, the structure applying the flowing method and double bubble sheets simultaneously exhibited the most favorable crack endurance, while conventional concrete showed more than 1mm size of crack in overall. In addition, a structure applying the flowing concrete method partially presented the micro crack. For the area proportion of crack occurrence, the structure using the double bubble sheets indicated 9.8%, while others applying flowing concrete method was 28%, compared with that of conventional one. For the compressive strength of specimens, standard curing specimens indicated $3{\sim}33%$ higher value than that of specimens cured besides the field construction. The specimens containing SRS improved the strength of $2{\sim}6MPa$, which is $10{\sim}22%$ higher than that of conventional concrete.

Effect of The Heat Curing Sheet Combined with Duble Layered Bubble Sheets and Light Heat Generating Materials on Surface Temperature History of the Concrete (광발열시트 및 2중 버블시트를 조합한 보온양생시트를 적용한 콘크리트의 양생 효과)

  • Han, Cheon-Goo;Han, Min-Cheol;Jung, Woung-Seon;Nam, Sang-Heon;Kim, Su-Hoo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2022.11a
    • /
    • pp.39-40
    • /
    • 2022
  • This study is intended to examine the curing effect of the combination of the bubble sheet on the concrete by analyzing the temperature profile and core strength of the simulated concrete structure. The test results relvealed that the average temperature of the concrete applying photothermal sheet overlapped with the double bubble sheet at the bottom was 23.5℃, which had the highest insulation and insulation effect compared to other types of surface insulation curing sheets, and the core strength increased by up to 56%.

  • PDF

Temperature Characteristics depending on the Changes of Surface-coated Curing Methods by using some bubble sheets during winter (동절기 버블시트 표면피복 양생방법 변화에 따른 철근의 온도특성)

  • Lee, Jea-Hyeon;Kyung, Yeong-Hyeok;Lee, Sang-Un;Lee, Joung-Gyo;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2016.10a
    • /
    • pp.13-14
    • /
    • 2016
  • In the modern construction industry, since numerous skyscrapers have been built, there have been sought for developing various kinds of methods for shortening a construction period. Therefore, many kinds of studies on some kinds of cold-weather concrete have been conducted actively for the purpose of a year-round construction. Accordingly, this research team once developed a double-layered bubble sheet as a surface-coated curing material for winter. And there have been raised some worries that some initial damages to frozen concrete caused by low temperature of reinforcing bars which are exposed out of the wall areas of a wall-type apartment during winter. Therefore, in this study, it is intended to find out clearly whether it is possible for concrete to be damaged initially or not by analyzing the temperature characteristics of the exposed reinforcing bars of the wall areas under the temperature conditions during winter.

  • PDF

Temperature background characteristics of concrete according to changes in bubble sheet types in hot weather environments (서중환경에서 버블시트 종류 변화에 따른 콘크리트의 온도이력 특성)

  • Lee, Jea-Hyeon;Lee, Jae-Jin;Lee, Sang-Un;Lee, Joung-Gyo;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2016.10a
    • /
    • pp.132-133
    • /
    • 2016
  • This research team has developed single silk white bubble sheets to be used as surface sheath curing material for spring, summer, and autumn. But though its effects for spring and autumn temperature conditions have been proved, there haven't been any studies for summer temperature conditions. Therefore in this study, single silk white bubble sheets and single silk transparent bubble sheets as well as aluminum metalizing single silk bubble sheets have been applied to actual box-frame apartment slabs in construction, in order to compare temperature backgrounds of the concrete and other qualities. Upon application, the temperature of concrete cured in summer temperature conditions showed excellent scores, being the lowest for aluminum metalizing single silk white bubble sheets, then single silk transparent bubble sheets. But the aluminum metalizing single silk bubble sheet gave off a harmful glare, so for actual use, white single silk bubble sheets are recommended.

  • PDF

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
    • /
    • 2012.11a
    • /
    • pp.45-46
    • /
    • 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.

  • PDF

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

  • Jung, Eun-Bong;Son, Ho-Jeong;Jang, Deok-Bae;Kyung, Yeong-Hyeok;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2012.05a
    • /
    • pp.269-270
    • /
    • 2012
  • This study discussed the applicability of double layered bubble sheet(BS) to the concrete for retaining wall to verify the insulation effect as well as prevention of condensation. The BS was applied to the surface of retaining wall, which is contacted with ground. Temperature profile was monitored since placement of concrete. As expected, the application of BS helps the concrete keeping favorable heat insulating, preventing condensation.

  • PDF