Excessive permeability are responsible mainly for early damage of asphalt pavement,quantitative analysis was made to elucidate the rule of influence of various factors on permeability of asphalt mixture.The results show that air void,types and gradations of mixture,nominal maximum aggregate size(NMAS) and thickness of mixture have important influence on permeability.The bigger NMAS and the air void,the more coarse gradation and thinner structure mean the bigger permeable possibility for asphalt mixtures.Com...