Abstract
This research divided granular water retentive building material into its material part and void part, and proposed a method of integrating both parts based on heat and moisture transfer formulae for each part. Next, granular water retentive building materials were installed outdoors on 5m by 5m square horizontal scales, and its surface temperature, water retention, etc. were observed. The results revealed that the surface temperature of granular water retentive building materials falls by 20°C more during the day and by 5°C more during the night than the surface temperature of ordinary asphalt covering. And simultaneous heat and moisture transfer of granular water retentive building material were analyzed based on a development model, confirming that its surface temperature and water retention behavior conform closely to the results of observations.
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