1996 Volume 40 Pages 449-454
Characteristics of heat and moisture transfer in porous pavement is investigated based on field observation and a numerical model. It has been found that the pore size in the pavement material posses a paramount importance for the transfer of water vapor. Ceramic porous pavements with small pore size inside can absorb a large amount of water from underlying soil, results in larger evaporation at the ground surface and lower surface temperature compared with other pavement. Usually the porous pavement surface is rather dry and the assumption of local equilibrium between liquid phase and vapor phase commonly used in numerical model for the computation of evaporation at the ground surface is not correct here. Thus, resistance to evaporation must be included in the numerical model to get good computation of evaporation. Due to evaporation, surface temperature and under surface heat storage of porous pavement is much smaller than impervious pavement.
