Foaming effect influence of PBT / ABS resin as a reducing agent in foamed asphalt

Abstract

Foamed asphalt provides good environmental protection characteristics and economy. The utilization rate of old materials in foam asphalt recycling technology is higher than that of emulsified asphalt. Due to the lack of performance, the application scope of foam asphalt recycling technology is limited. In order to maintain high utilization rate of recycled asphalt concrete and improve the performance of foamed asphalt mixture, it will be the focus of research. In recent studies, adding a reducing agent into the regeneration process of foamed asphalt is a new technology. According to the test results of reduction performance of asphalt SARA four components, the PBT/ABS resin (Acrylonitrile butadiene styrene modified by Polybutylene Terephthalate) has excellent asphalt reduction effect, and PBT/ABS resin has good compatibility with emulsified asphalt after emulsification. Therefore, based on the existing foaming theory, the influence of asphalt temperature and water consumption on asphalt foaming with PBT / ABS resin reducing agent was designed. The influence of asphalt temperature and water consumption on foamed asphalt modified by PBT / ABS resin reducing agent was discussed. The results show that the PBT/ABS resin has larger foam volume than ordinary foam asphalt, but the average diameter of foam is slightly smaller. Similar to ordinary foamed asphalt, expansion rate and half-life are opposite to that of water consumption. Water consumption and asphalt temperature have significant effects on foaming effect. At the same temperature, with the increase of water consumption, the expansion rate increases and the half-life decreases. Under the same water consumption, the higher the foaming temperature, the greater the expansion rate. However, when the temperature reaches 160 °C, the expansion rate of asphalt does not vary with the temperature. With the increase of temperature, asphalt with different temperature has different optimal foaming water consumption. Finally, the optimum foaming conditions of PBT/ABS resin foam are given as follows: the best foaming temperature is 140 C, the water consumption is 3.8%, the ultimate expansion rate is 21.5%, and the half-life is 22.5s.