• Title/Summary/Keyword: Lee Han-Cheol

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Property Change of Cement Mortar Incorporating FA by Immerging Vegetable Oil (식물성 유지류에 침지된 FA 치환 시멘트 모르타르의 품질변화)

  • Baek, Cheol;Lee, Jae-Hyeon;Hwang, Chan-Woo;Han, In-Deok;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2016.05a
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    • pp.147-148
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    • 2016

  • Generally, the vegetable oil contains glycerin esther and free fatty acid. When the vegetable oil reacts with concrete, the glycerin esther from oil induces saponification by reacting with and hydrolyzing calcium hydroxide from cement hydration. As a result of this saponification, it has been reported the expansion of concrete. although the free fatty acid from vegetable oil, as an acid, can decompose the concrete by producing soluble salt from calcium hydroxide or CSH, the hydration products of cement, there was no report on the harmful oil type for concrete. therefore, in this research, the property change of cement mortar incorporating fly ash was analyzed experimentally by immerging various types of vegetable oils.

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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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Evaluation of Penetration Depth of Emulsified Refined Bio Diesel Applied to the Concrete (유화처리 바이오디젤이 도포된 콘크리트의 침투깊이 판정)

  • Baek, Cheol;Kim, Tae-Woo;Lee, Jae-Jin;Lee, Dong-Yun;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.17-18
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    • 2017

  • This study is to provide a evaluation method for the penetration depth of emulsified refined bio diesel(ERBD)applied to a surface of the concrete by using water absorption capability of the concrete. The concrete applied with ERBD was immersed at water for 1 min., 5min., and 10 min. and then was checked the brightness with elapse of time. Test results indicated that there was clear difference between ERBD part and non ERBD part in concrete specimen after measuring the brightness until 120min.

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