关键词: 硅藻土;物理特性;化学成分;沥青指标;沥青混合料性能;灰色关联

Abstract: In order to study the influence factors of physical and chemical properties on diatomiteon asphalt and asphalt mixture,in this paper,SiO2content,diatom content,average particle size,specific surface area and bulk density of four types of diatomite were tested, and the four types of diatomite modified asphalt and road performance of diatomite asphalt mixture were tested, with the grey relational theory the factors of properties of diatomite affect the modified performance of asphalt and asphalt mixture were analyzed.The results show that it has differences in physical properties and chemical composition with different diatomite,when diatomite with high content of diatom and SiO 2,larger specific surface area and lower bulk density, the diatomite modified asphalt mixture has more excellent water stability, high temperature stability and low temperature crack resistance.The shearing strength of the diatomite modified asphalt used for evaluating high temperature performance of asphalt,which has good correlation with the dynamic stability asphalt mixture.In order to make the diatomite modified asphalt mixture has better road performance,SiO2and diatom content of diatomite should more than 80%.

Key words: diatomite;physical property;chemical composition;asphalt index;asphalt mixture performance;grey relational theory