|
Title |
Experimental Study on Properties of Temperature History Using Heating Sheet and Insulation Form at Low Temperature
|
|
Authors |
최시현(Si-Hyun Choi) ; 이한승(Han-Seung Lee) ; 최현국(Hyun-Kuk Choi) |
|
DOI |
https://doi.org/10.11112/jksmi.2017.21.4.132 |
|
Keywords |
저온환경 ; 발열거푸집 ; 단열거푸집 ; 발열시트 ; 온도이력 Low temperature ; Heating sheet ; Insulated form ; Heating form ; Temperature history |
|
Abstract |
In this study, in order to prevent the frost damage of the concrete, the characteristics of the form using heating sheet utilizing the chemical reaction of quicklime and the insulation were evaluated through experiments at low temperature. In the case of form at ?10°C, the form with attached heating sheet showed a temperature history of more than 10°C higher than that of wood form at the early of concreting due to heat of the quicklime in the heating sheet. In the case of the insulated form, the concrete was kept at a high temperature by preserving the hydration heat. When the heating sheet and the isopink(extruded polystyrene) were attached together on the form, the effect was the same as that of the vacuum insulation. The compressive strength of the form with vacuum insulation and form with isopink, heating sheet as measured about 5 MPa at age 3. The experimental in Mongolia, as with the pervious results, the form with the heating sheet and the insulation showed the highest temperature history over 25°C for 48 hours. Therefore, it was confirmed that the heating sheet and insulation are attached to the form, which helps the concrete strength development at low temperature by heat generation and the insulation effect.
|