表 面 活 性 泡 沫 沥 青 发 泡 工 艺 及 流 变 特 性 研 究

Warm mix asphalt technology can reduce the production and construction temperature of asphalt mixtures, and has great application potential in energy conservation and carbon reduction. The foamed warm mix asphalt technology has the advantage of low cost, but there are some problems such as the unsatisfactory foaming effect of modified asphalt and the insignificant warm mix effect, so it has potential application prospects. Surfactants have the effects of both“asphalt lubricant”and“foam stabilizer”, which makes it possible to improve the foaming characteristics and warm mix effect of foamed warm mixed asphalt. Based on this, this study prepared surfactant additive foamed asphalt (SAFB6, SAFB8, SAF10) with different mass fractions of surfactant additives and foaming temperatures. The foaming test, dynamic shear rheology test and bending beam rheology test were used to investigate foaming properties, high temperature performance, fatigue resistance and low temperature performance. The mechanism was analyzed by Fourier infrared spectroscopy test, and the synergistic effect of both surfactant and foaming process on the performance of foamed warm mix asphalt was revealed. The experimental results show that surfactant additives had a significant synergistic effect on the foaming properties of SBS modified asphalt, especially the half-life, which reached up to 69 s. The best foaming conditions can be achieved when the foaming temperature and surfactant additives content are 170 ℃ and 8%, respectively. No complex chemical reaction occurs during the preparation of SAFB asphalt, but the foaming process resulted in a certain degree of oxidation of SBS modified asphalt. The synergistic effect of the surfactant additives and foaming process improves the high temperature performance and fatigue resistance of the SBS modified asphalt, while the low temperature crack resistance is equivalent to that of SBS modified asphalt. Generally, the combination of surfactant and foaming technology is feasible, which improves the foaming effect and road performance of SBS modified asphalt.