In the winter term, new technology which cures the concrete of the housing base was described. This new technology uses the PTC ceramics as heater element of the heating sheet. Since the PTC ceramics detects the ambient temperature, and since it controls the heat quantity immediately and automatically, the temperature detector is not required. Therefore, this heating sheet used the PTC ceramics can expect heating curing which was surely stabilized safety without discharging the carbon dioxide. From performance test result of construction test and curing temperature test, it was explained that this heating sheet curing method was very effective.
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