Abstract
There was a problem of always securing prevention of an initial frost damage and prescribed strength in construction in winter of housing foundation concrete. PTC ceramics were developed as a new technology to solve the problem and the heater element heat curing seat industrial method was developed. It is a safe, reliable care method because PTC ceramics are the resistance bodies into which resistance sensitively changes depending on the temperature, and the ambient temperature is detected and it controls the calorific value automatically. It was confirmed that it was a concrete care method with effective this care method from the care performance examination result and the construction data compared with the method of taking care of one's health the heating of the past etc.
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