Abstract
Herein, the effects of the contents of emulsified asphalt, waterborne epoxy resin emulsion, and curing agent on the permeability, bond shear strength, water stability, and aging resistance of epoxy-emulsified asphalt were studied. A formulation of epoxy-emulsified asphalt as a fog-sealing adhesive material was recommended, and a comparison between the fabricated adhesive material and a traditional Chinese fog-sealing adhesive material was conducted to verify the technical performance of the new material. In addition, the strength formation mechanism of the epoxy-emulsified asphalt was revealed via microcosmic analysis. Results show that the curing agent content mainly affects the permeability of epoxy-emulsified asphalt, and the emulsified asphalt content significantly affects the bond shear strength, water stability, and aging resistance. Moreover, the ratio of waterborne epoxy resin emulsion to the curing agent (epoxy ratio) has a certain effect on the bond shear strength. In the recommended formulation (a high-permeability and high-bonding fog-sealing adhesive material, which can be referred to simply as HPBFA), emulsified asphalt accounts for 80% of the total mass of the mixture, and the epoxy ratio is 2:1–3:1. It can improve air permeability, bond shear strength, water stability and aging resistance. The HPBFA-cured material exhibits a continuous three-dimensional network structure, hydrophobic surface, and large contact angle. Furthermore, the initial thermal weight loss temperature of the HPBFA-cured material is significantly higher than the environmental aging temperature. Additionally, the maximum temperature decomposition range is 0–160 °C, indicating improved strength, wear resistance, permeability, and aging resistance of the material.
Highlights
Song et al believe that fog sealing may improve the durability of open-graded friction course (OGFC) and extend its service life [11]
The results show that the permeability of HPBFA is slightly lower than that of BE-4-emulsified asphalt but still exhibits obvious advantages
When the amount of HPBFA, SBS-modified emulsified asphalt, and the asphalt commonly used in fog-sealing layers is 0.6 kg/m2, the tank-plate specimens can be completely impermeable
Summary
Montgomery et al applied fog sealing material to longitudinal joints and compared it with the treatment method of void reducing asphalt membranes and concluded that the performance of fog sealing treatment was better [7]. Nadeem et al evaluated the effectiveness of aerosol and regenerative seals by evaluating surface friction and durability and optimized the dosage [8]. Song et al believe that fog sealing may improve the durability of open-graded friction course (OGFC) and extend its service life [11]. Lin et al found that the recycled sealing material effectively softened the aging asphalt binder and reduced the high temperature performance of hot mix asphalt [12]
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