Abstract：Based on cracking simulation of original pavement, the infiltration tests were carried out under hydrodynamic pressure, and the effects of fiber content, aggregate lithology, diameter and modified emulsified asphalt content on impervious performance of seal were investigated. The requirements of impervious performance in different traffic environments were proposed, and the strengthen mechanisms of impervious performance for seal were revealed based on SEM test at mesoscopic scale. The results indicate that fiber content shows more dramatical impact on impervious performance than aggregate lithology when the thru hole aperture of perforated plate is less than 3 mm, while it shows the opposite effect when the aperture is more than 3 mm. With the increasing of aperture, the influence of asphalt content on impervious performance is decreased. The thicker the asphalt film is, the less the influence of aperture on impervious performance is. VMA of seal with 5-10 mm aggregate is higher than those with 3-6 mm and 4-8 mm aggregates under the same content, which minifies the bonding areas by asphalt with decreased adhesion. The physical and chemical absorption of glass fiber on asphalt can strengthen the adhesion between asphalt and aggregate, and the fibers distribute uniformly in the seal to inhibit the cracks for protecting asphalt film and to strengthen the impervious performance of seal effectively.
2018, Vol. 39 
