2.1. Materials

Table 1 shows the performance of the self-developed emulsified asphalt technology. The technical requirements of BE-4 type emulsified asphalt are implemented by referring to the requirements of PC-2 type emulsified asphalt in the Technical Specification for Construction of Highway Asphalt Pavement (JTG F40-2004).

Technical properties of BE-4-emulsified asphalt.

The technical properties of the waterborne epoxy resin emulsion used in this experiment are shown in Table 2. The hydrophilic–lipophilic balance (HLB) value of the waterborne epoxy resin emulsion was 14.9, and this emulsion showed good centrifugal stability.

Technical properties of E-44 epoxy resin.

Waterborne epoxy resin emulsion was prepared by phase inversion, and the stability of the emulsion was taken as the main evaluation basis. The main preparation steps are as follows: the epoxy resin was heated to a certain temperature, and then stirred evenly by a high-speed shear dispersion emulsifier; complex emulsifier was added, and then hot water was slowly added and stirred evenly. The mixture was emulsified at the emulsifying temperature of 70 °C for 30 min to obtain waterborne epoxy resin emulsion.

The curing agent used in the test was obtained from Xi′an Huize Road Material Co., Ltd., Xi’an, China. Table 3 shows the technical properties of the curing agent.

Technical properties of the curing agent.

AC-13 and SMA-13 asphalt mixtures were used to simulate the actual asphalt pavement surface, on which the fabricated fog-sealing adhesive material was sprayed. Figure 1 presents the gradation of the mixtures. The asphalt/aggregate ratios of AC-13 and SMA-13 were 4.8% and 5.0%, respectively.

Gradation of the mixtures.