Application and Research of the Housing Base Concrete to the Curing Using New Heating Sheets

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Title: Application and Research of the Housing Base Concrete to the Curing Using New Heating Sheets

Author(s): A. Fukai and M. Sugiyama

Publication: Special Publication

Volume: 235

Issue:

Appears on pages(s): 257-268

Keywords: compressive strength; curing; heating sheet; low temperature; on-site testing

Date: 3/22/2006

Abstract:
This study evaluated the viability of electric heating sheets for the curing of concrete housing foundations in severe, low-temperature environment. The heating sheets tested use PTC (positive temperature coefficient resistor) ceramic elements. The heating temperature is automatically adjusted by these elements in response to adjacent air temperature. The experiment was carried out in two series. The first phase was carried out at -10°C in a thermostatic chamber. The second phase involved on-site testing. Under severe, low-temperature conditions, of up to -11°C outside air temperature, it was found that curing was possible at about +15°C through the use of heating sheets. Compressive strength was found to be sufficient. The heating sheet is considered to be extremely useful for curing concrete in cold regions.