Abstract: Microwave heating can make asphalt cracking at low temperature and enhance chemical activity, which is theoretically conducive to the occurrence of sulfur cross-linking reaction, and then affect the engineering properties of sulfur-modified asphalt by changing the ratio of free sulfur to cross-linked sulfur. In order to analyze the effect of microwave heating pre-activation on the sulfidation reaction and engineering properties of asphalt, a comparative test was carried out to two kinds of asphalt, microwave activation-sulfidation and direct sulfidation. In terms of sulfidation reaction, the free sulfur and total sulfur content were measured by the improved sodium sulfite oxidation-iodine titration and high temperature combustion method, respectively, and the state of surface crystallization precipitation was observed by body-view microscope. It was found that the activation energy of microwave activated-sulfided asphalt reaction was relatively reduced by 24%, and the speed of the sulfidation reaction was increased, meanwhile, there were more free sulfur was converted into cross-linked sulfur. In terms of engineering properties, through a series of asphalt rheology tests such as temperature scanning, MSCR, LAS, BBR and aging tests RTFO, it was found that modulus of microwave activation-sulfurized asphalt was relatively improved and elasticity was enhanced, rutting resistance at high temperatures improved significantly, fatigue life increased by 4—6 times at medium temperatures, low-temperature cracking resistance improved slightly, and heat and oxygen aging resistance improved. The microwave pre-activation allows more free sulfur to be converted to crosslinked sulfur, which makes the asphalt colloid structure more stable by strengthening the crosslinks and weakening the adverse effects of free sulfur, and this is the fundamental reason for the relative improvement in the engineering properties of microwave activated-sulfurized asphalt. This microwave pre-activation is not only efficient and feasible to asphalt, but also has potential benefits for other modification methods.
王黎明, 庞宏, 孙永卓, 董明泽, 徐永丽. 微波预活化对沥青硫化反应的促进作用和工程性质影响研究[J]. 材料导报, 2025, 39(14): 24080239-7.
WANG Liming, PANG Hong, SUN Yongzhuo, DONG Mingze, XU Yongli. The Effect of Microwave Pre-activation on the Promotion of Asphalt Vulcanization Reaction and Engineering Properties. Materials Reports, 2025, 39(14): 24080239-7.
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2025, Vol. 39 
