Abstract
Warm mix agent is the key factor to restrict the performance of warm mix asphalt. In this paper, methods of X-ray diffraction, thermal stability test, and laser particle size analysis were used to test and analyze the internal structure, composition, and properties of three kinds of warm mix agents. In order to study the performance impact of the warm mix agent on SBS-modified asphalt, the warm mix agents of Advera®, LTA synthetic zeolite, and 13X synthetic zeolite were added to SBS-modified asphalt in different contents. The three kinds of warm mix asphalt were tested by the experiments of softening point, penetration, and ductility to analyze their physical properties. The testing results showed that the softening point of three kinds of warm mix SBS-modified asphalt is greater than the softening point of SBS-modified asphalt without adding warm agents, which indicate the warm mix additives can improve the high-temperature stability of SBS-modified asphalt. The three kinds of the warm mix agent make SBS-modified asphalt hard, and the consistency and the ability of resisting deformation increase. The low temperature performance of SBS-modified asphalt decreased in different degrees with mixing different zeolite warm mix agents.
Highlights
Compared with hot-mix asphalt, warm-mix asphalt technology can wrap asphalt in aggregate at low temperature by some technical measures, which has good adhesion and lubricity and increases the construction operation of asphalt mixture
It has been proven that the amount of zeolite additive depends on the type of the zeolite structure
With the addition of zeolites and mesoporated silica materials impregnated with water has been researched by Woszuk et al [10, 15, 16]. e investigation of zeolite as a WMA additive and its comparison with different types of WMA additives were studied [17–22]. e viscosity reduction effect factors of asphalt mixture are closely related to the warm mix agents and asphalt properties. e reason is that the compatibility and compatibleness between asphalt type and warm mix additives are very different
Summary
Compared with hot-mix asphalt, warm-mix asphalt technology can wrap asphalt in aggregate at low temperature by some technical measures, which has good adhesion and lubricity and increases the construction operation of asphalt mixture. After mixing, these technical measures shall not adversely affect pavement performance so as to ensure that the road performance of the mixture is not less than that of the hot mix asphalt. E reason is that the compatibility and compatibleness between asphalt type and warm mix additives are very different. In order to study the effect of the three kinds of warm mix additives on the properties of SBS-modified asphalt, the three kinds of warm mix asphalt were tested using the experiments of softening point, penetration, and ductility
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