The Research On Performance And Mix Design Of Fiber Glass Asphalt Concrete

With the development of traffic project in China, growing rapidly traffic flux, improving vehicle load, application of special tires and phenomena of overloaded vehicle, which induces more highly requires of the pavement material and performance. At the same time, the increasing stress in highway investment and maintenance. Improving pavement quality of using, prolonging pavement life, improving investment benefit, which is an important task in traffic department now. For settling these existent questions in the asphalt pavement, every country researchers have been studying a great number of works, and gained more harvest. At the present time, the asphalt pavement technology has been changed greatly and many methods had been developed to improve the performance of asphalt pavement, such as the Superpave, the technology of modified asphalt, the SMA, and so on. Among them, the fiber strengthened asphalt pavement is a successful alternative both domestically and overseas. It is expectative because of both its eminent performance and simple construction technology, and its economical preponderance.This paper relies on a communications project at Jilin University, "modified glass fiber reinforced asphalt concrete pavement durability study," and Dr. Subject point Fund Project "cold regions glass fiber reinforced asphalt concrete the theoretical and experimental research" the two projects to complete. The paper based on the large number of glass fiber asphalt mixture indoor test about Marshall and the parameters, researched the uniqueness for glass fiber asphalt mixtures and the overall performance of parameters, while on studied the method and process for the road with glass fiber asphalt mixture design optimization techniques and construction technology. The full text is divided into six chapters, of these chapters, chapters three, four and five are kernels.Chapter one is the introduction, introduced the studying background, purpose, significance and the studying contents of this thesis. After nearly 50 years of study,in the United States, Western European and other countries are already large area use and research the modification role of fiber strengthen the asphalt mixture. At the same time, development also has developed its own fiber and fiber adding equipment to provide convenience to the spread of fiber asphalt mixture. China began research the fiber asphalt mixture in the 1990s, and that at present the research for the capability of the fiber asphalt mixture lack comprehensive and purposeful. There has not yet formed a complete design theoretical system and the study of the construction technology should also be strengthened. The research of this thesis is through a lot of experiment, evaluate all the parameters of glass fiber asphalt concrete systemically, and put forward the mix design optimization and the construction technology aim at adding fiber glass and dense gradation asphalt mixture.The second chapter describes the technical specifications of various raw materials. Introduced the technical index of the various parameters for the asphalt, aggregate and the mineral filler, and depicted emphatically the main physical parameters of glass fiber. Aim the request of endure high temperature at the fiber used in the mixture production, progressed the heat resistance experimental study for the glass fiber and found the glass fiber have better heat resistance, so the higher the mixing temperature the better resistance the aging metamorphism. Form the moisture absorption test of the glass fibers we can found that the hygroscopicity of the glass fiber smaller, That shows that the fiber more difficult wet in their custodial process.The third chapter is the analysis and evaluation for the measure results of all parameters indicators. By a large number of indoor experiments, measured allparameters indicators of the asphalt mixture, provided the basis for the optimal design of the glass fiber asphalt mixture. At the same time, according to the contrast test of the high temperature stability, low temperature cracking, Comparison of water stability and resistance to fatigue test for the common mixture and the asphalt mixture added to the glass fiber. Analysis and evaluation of the results of the experiment, find that after added to the glass fiber, all parameters indicators of the asphalt mixture have improved significantly. Thus, we see the importance conclusion that by adding an appropriate amount of glass fiber in the course of construction of asphalt pavement can extended the life of pavement effectively.Chapter four presents the design optimization scheme of glass fiber asphalt mixture. The mix design process of glass fiber asphalt mixture generally consist to the ordinary dense gradation asphalt mixture, no more than need to consider the mix amount of the glass fiber, and other design process is not very different from the ordinary mixture, so easy to be extended. According to the design optimization concluded ultimately that after gradually filtrate, returning allocation gained the aggregate gradation adopt to the median gradation of the criterion requirements AC-13I Value. Used to The Marshall Test standard determine the best asphalt dosage and the best glass fiber mix amount. Ultimately the best glass fiber mix amount is 0.20%, and the best asphalt dosage is 4.7%.Chapter fifth presents the glass fiber reinforced asphalt concrete construction technology. The Pavement Surface Construction of the glass fiber asphalt mixtures generally consist to the other dense gradation asphalt mixture, including the determination of the mixture mix, mixing and transport, paving, compaction and so on. The difference is the addition of fiber, mixing time, mixing temperature and the grind time. Due to the addition of glass fiber, it is necessary to extend the time tolet fiber wrap aggregate uniformly. Moreover, due to the stiffness of asphalt has increased when the glass fiber accede to asphalt mixture, cause the sticky temperatures rise in the Mix construction, so in the mixing of mix, generally raise the every link temperature about 10°C to 15°C. In addition, after adding glass fibers, the density of mixture increasing and the porosity decrease, thus in the construction course of fiber asphalt mixture must be pay attention to compaction guarantee Compaction, that can be realize by increasing several times or improving compaction success.Chapter sixth is the summary of the papers that summarize the work in the completion process of the dissertation, and also refer to the content and direction of necessary continue research in work for the future.Indoor Test parameters and the unpaved road tests proved that glass fiber asphalt mixtures can improve the high-temperature stability and low temperature cracking, and the ability to enhance its antireflection cracks fatigue life. All parameters showed its fiber asphalt mixture to adapt to special climate and the harsh environment, road shows worth of glass fiber asphalt mixtures and applications.Indoor all parameters Test and the unpaved road tests proved that glass fiber can improve the high-temperature stability and low temperature cracking asphalt mixtures effectually, and the ability to enhance its antireflection cracks capacity and fatigue life. All parameters indicators showed that fiber asphalt mixture can adapt to the harsh demand of special climate and environment, so glass fiber asphalt mixtures deserve to extend and applications.