Abstract
The objective of this investigation is to prepare the shape memory hydrogenated epoxy resin used for asphalt mixtures (SM-HEP-AM) and study its properties. The shape memory hydrogenated epoxy resin (SM-HEP) is prepared using hydrogenated bisphenol A epoxy resin (AL-3040), polypropylene glycol diglycidylether diacrylate (JH-230), and isophorone diamine (IPDA). The formulations of the SM-HEP-AM are obtained by the linearly fitted method. The thermo-mechanical property, molecular structure, and shape-memory performance of the SM-HEP-AM are studied. The glass-transition temperature (Tg) is determined using the differential scanning calorimeter (DSC). The results proved that the Tg level increased when the JH-230 content decreased. The thermo-mechanical property of the SM-HEP-AM is measured by dynamical mechanical analysis (DMA). The storage modulus of the SM-HEP-AM decreased with the increase in the JH-230 content. The above phenomena are attributed to the change in the JH-230 content. The shape memory performance results of the SM-HEP-AM indicate that specimen deformation can completely recover after only several minutes at Tg + 10 °C and Tg + 20 °C. The shape recovery time of the SM-HEP-AM increases with increased JH-230 content, and the change between the shape recovery time and JH-230 content gradually decreased as the temperature increased. The deformation recovery performance of asphalt mixture with and without the SM-HEP-AM (Tg = 40 °C) was tested by the deformation recovery test. This was used to prove that the SM-HEP-AM helps to improve the deformation recovery performance of the asphalt mixture.
Highlights
Rutting caused by heavy loads at a high temperature is one of the typical distresses in asphalt pavements
When the vehicle load is applied to the asphalt pavement surface at high temperatures, deformation of the asphalt mixture will occur
Since the primary self-healing principle of asphalt mixture is the capillary flow of the bitumen through the cracks at high temperatures, the self-healing process of asphalt mixture is a very slow process and the cracks may need a long time to completely self-heal [2]
Summary
Rutting caused by heavy loads at a high temperature is one of the typical distresses in asphalt pavements. Rutting has an important influence on the performance of asphalt pavements during their life period [1]. When the vehicle load is applied to the asphalt pavement surface at high temperatures, deformation of the asphalt mixture will occur. Because the asphalt mixture is one kind of self-healing material, the deformation can partially recover once the load is removed. Since the primary self-healing principle of asphalt mixture is the capillary flow of the bitumen through the cracks at high temperatures, the self-healing process of asphalt mixture is a very slow process and the cracks may need a long time to completely self-heal [2]. In practice, the asphalt pavements undergo continual vehicle loads, and the cracks of asphalt mixture are impossible to completely self-heal [3].
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