鎢酸鋯改性瀝青膠漿的路用性能研究
[Abstract]:The temperature shrinkage crack of asphalt concrete pavement has been a difficult problem for road workers for a long time. The temperature shrinkage crack not only affects the beauty of the road, but also induces other diseases, which seriously affects the service performance and service life of the road. The research shows that asphalt mortar plays a decisive role in the cracking resistance of asphalt mixture, so it is necessary to modify the asphalt pavement to reduce the temperature shrinkage crack of asphalt pavement. Zirconium tungstate has been widely used in the field of materials because of its special negative expansion effect. According to the negative expansion characteristics of zirconium tungstate, this paper proposes that zirconium tungstate can replace mineral powder to improve the shrinkage of asphalt slurry at low temperature, and finally reduce the cracking of asphalt pavement at low temperature. At the same time, the modification effect of zirconium tungstate was evaluated. Firstly, the basic performance of asphalt raw materials is tested according to the specifications. In this paper, the density, particle size distribution, microgradation, pore structure and hydrophilic coefficient of filler ore powder and zirconium tungstate are studied. The results show that zirconium tungstate has the advantages of small particle size, uniform distribution, rich pore structure and strong activity, but the density and hydrophilic coefficient of zirconium tungstate are larger than those of ore powder. Secondly, the low temperature performance of zirconium tungstate modified mortar is the most important index to evaluate the modification effect. The creep stiffness, creep rate and relaxation characteristics of different zirconium tungstate replacements were studied by bending beam rheometer. At the same time, a set of low temperature volume shrinkage coefficient testing device of asphalt material was developed, and the shrinkage coefficient of rubber paste was tested by this device. The correlation analysis between the rheological test results of bending beams and the volume shrinkage coefficient of cement paste shows that there is a good correlation between them. The results also show that with the increase of zirconium tungstate substitution ratio, the low temperature performance of asphalt mortar is improved significantly. Furthermore, the mid-high temperature performance of zirconium tungstate modified asphalt slurry was analyzed. The high temperature stability and moderate temperature fatigue resistance of the mortar were evaluated by dynamic mechanical method. The compatibility analysis and interface loss performance of the multicomponent mixture were studied. At the same time, based on the theory of surface energy, the interfacial bond strength, that is, water damage resistance, was evaluated, and the comprehensive mechanical properties of the mortar were characterized by the results of the adhesive toughness test. The results show that the addition of zirconium tungstate can improve the fatigue resistance, interfacial properties, water damage resistance and comprehensive mechanical properties of the paste, but to some extent it will reduce the high temperature properties of the paste. Finally, the type of action between filler and asphalt is determined by infrared spectroscopy. The results show that there is a physical-chemical reaction between filler and asphalt. Based on the previous test results, the correlation between the basic properties of fillers and the properties of mortar was analyzed. The results show that the density of fillers has a significant effect on the high and low temperature and fatigue resistance of the mortar. And the X 90 is used as the evaluation index of the micro gradation of filler. It was also found that the specific surface energy and active C value of fillers were significantly correlated with the low temperature properties of the slurry, but not with the high temperature and fatigue resistance. It is proved that zirconium tungstate has the effect of improving the low temperature performance of the adhesive obviously. Besides the low temperature property of the slurry, the fatigue resistance and the water damage resistance are improved. This shows that the use of zirconium tungstate to modify asphalt mortar has significant application value and research significance.
【學位授予單位】:哈爾濱工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:U414
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