合成高分子防水材料の熱劣化負荷地図の作成とその利用

概要

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A load map for thermal degradation which is available to predict degradation of elastomeric roofing materials has been developed. The thermal degradation load is given by the formula Σexp (-B/T)- t, where B is a mate rial constant, T is absolute temperature (K) and t is time (hrs). The temperature of the roof membrane, ambient air temperature, solar radiation and wind velocity was measured for one year at Yokohama to make clear the relation between the thermal degradation load and the weather elements. Being based on the meteorological data from 1979 to 1988, the thermal degradation loads at 66 points in Japan were calculated, and a load map was drawned by dividing them into several zones. The field tests of two rubber sheets were carried out at Sapporo, Yokohama and Naha from May 1987 to April 1988 to evaluate the usefulness of the map. The degraded values, elongation rate at break of rubber, were compared with the predicted values. And it was concluded that this method by applying the thermal degradation map was useful for prediction of degradation of materials which were mainly affected by solar irradiation heat.
社団法人日本建築学会の論文
1990-02-28