Study On Standards Of Asphalt Mixture Aggregate

Asphalt concrete pavement with a solid, durable, smooth, good slip resistance, impervious, resistant tofatigue cracking and temperature stability of high temperature, most of the roads in China are used asphaltconcrete pavement. But with the rapid development of economic, the growth of the transport industry and theincreasing of the large vehicles and overloading vehicles, the asphalt pavement appeared early rutting,translation, cracking, subsidence and other diseases. These diseases affect traffic safety, thereby endangeringthe lives of the people, and to repair these roads will also loss a lot of money.Aggregate constitutes the main component of asphalt, which is divided into coarse and fine aggregates.And the coarse aggregate play a role of supporting the framework to the mixture, and has a great impact on theskid resistance of the road and the high temperature stability of the mixture. Fine aggregate is mainly filled inasphalt mixture to increase its compactness, which is helpful to improve the ability to resist the water damageand durability of the mixture. There are a lot of literature on fine aggregate angularity and high temperaturestability of the mixture in domestic and abroad. But the researches for other performances of the mixture andfine aggregate are few.While the "performance" the mixture of is a comprehensive concept, high temperature stability is onlymore important aspect of the performances. Since the FAA regarded as the standard to judge fine aggregatequality, so only considering the impact of its high temperature stability, there will be a certain lack, so we needto study the role of other important cases。In this paper, basis on the construction of the Tangshan Cheng Tang expressway project, we developed aninstrument to measure internal friction angle of the fine aggregate by research. Through testing, analysis,research on the relationships between internal friction angle and fine aggregate angularity, sand equivalent,flow time and the road performance of mixture, through the comparative analysis of the relationships betweenthe fine aggregate internal friction angle, angularity, porosity and the water stability, high temperature stability,low temperature properties of the mixture, we found that the friction angle of fine aggregate can be used as afeature standards of fine aggregate. And we can use internal friction angle to replace the angularity and sandequivalent of fine aggregate.