Hybrid Waterproofing Polymer-modified Asphalt Filled with Carbon Fiber and Inorganic Materials

In this study, an optimal composition of hybrid fillers was sought to be filled in hybrid waterproofing polymer-modified asphalt. The hybrid waterproofing polymer-modified asphalt filled with carbon fiber (2.5%) and stearic acid-coated CaCO3 (2.5%), which was turned out the optimal filler composition, satisfied the requirements of tensile strength, elongation and tearing strength of KS F 3211 unlike a waterproofing polymer-modified asphalt with a basic composition without the hybrid fillers or with 5% CaCO3 as a conventional filler. In addi- tion, in case of the specimen of waterproofing polymer-modified asphalt with a basic composition, filled with 5% CaCO3 as a conventional filler, the requirement of water pressure of water penetration resistance (i.e., 0.3 N/mm(2)) was not satisfied according to KS F 4935. However, in case of the specimen of the hybrid waterproofing polymer-modified asphalt filled with carbon fiber (2.5%) and stearic acid-coated CaCO3 (2.5%), the requirement of water pressure of water penetration resistance was satisfied according to KS F 4935, even though water even penetrates at the water pressure of 0.4 N/mm(2).