Study On Asphalt And Rock Asphalt Mixture Performance

The professional master's degree thesis, the active agent in a variety of rock asphalt content mix asphalt performance,in order to find a more suitable mixing ratio. According to previous research experience in this industry, there are two types of existing instruments, one is commonly used in China, find the nature of the orders , the so-called three national standard, additional number of related indicators , such as the wax content, viscosity, density, evaporation losses . one is a set of planned U.S. system of SHRP . include temperature scanning, frequency scanning, RTFOT aging test, PAV aging test, BBR creep tests. For the mixture, there are two systems, one is commonly used in Marshall test system in China, a latest achievement of the United States testing system for superpave mixture.Under the circumstances, the study of asphalt part of the study, using the national standard and the combination of temperature scanning methods, as rock asphalt with asphalt can greatly improve high temperature performance, but it will affect the low temperature performance of a small amount of features, this paper its high temperature properties of the major indexes were tested, and for its low temperature performance, such as ductility, BBR creep curve, there is no data collection. It is generally believed that as long as meet the requirements of modified asphalt can be cold, even as rock asphalt mainly used in Guangdong and Guangxi, southern China, its low temperature performance can be further relaxed requirements. For mixture, as is still the major domestic use of the Marshall system, grading, testing methods, so this study is to use the Marshall method of its stability, freeze-thaw splitting strength test. Also the fourth chapter in the text of the rock is also active agents in the chemical composition of asphalt, although the basic theoretical analysis, but after all, a good idea to study the microscopic nature. After a series of studies, comprehensive high temperature properties of the rock with a quantitative concept, by the nature of their pitch indoor experiment, the optimum asphalt content should be 50%, partial to 100% (the proportion of text ), the actual amount is converted into the rock inside the asphalt part of the asphalt content of asphalt A70 total use ratio is 20% (mass ratio). In the low part, rock asphalt mixing does cause some low-temperature performance of asphalt has been reduced, but did not imagine the impact such a large, high-temperature zone for the South, is part of its much lower detection Buzhi Yu can. Mineral grains of rock asphalt content will be much larger low-temperature performance of asphalt, while improved high temperature performance is not obvious, is not recommended. The so-called big, generally refers to more than rock mineral content of 88% asphalt content.