Study On Performance Of Diatomite-modified Asphalt Mixture

Asphalt pavements prevail in China,but early destructions appear around asphalt pavements because of large traffic and heavy load.Asphalt and asplait binder have close relative to asphalt pavement,and generic asphalt can not satisfy,so all countries are carrying out wide study with usage performance of asphalt and asplait mixtures.There are plenty of diatomite resources in JiLin province.This paper selects diatomite as inorganic modified material for asphlat,and deeply researches the performance of pavement of diatomate-modified asphalt mix by a great deal tests.In order to change the situation of polymer modified asphalt,develop direction in the future respresenting the mineral modified tochnology and utilize the diatomite resources effectively, which offers academic elements for the widely application of diatomite-modified asphlat mixtures.It is shown by the modern testing,that the important thing for the diatomite modified asphalt is the mineral components of active non-crystal SiO 2.Diatomite is scattered in the asphalt steadily,which is absorbed and adhesioned with asphalt,thus change the performance of asphalt and then improve the service performance of asphalt mixture and asphalt.Diatomite is a mineral,while the mechanism of diatomite modified asphalt is different with that of polymer modified asphalt.The most obvious feature of diatomite is enormous specific surface area and multi-pore structure of diatomite and non-crystal SiO 2 structure,which is the base of mechanism analysis for the diatomite modified asphalt.A series of laboratory tests of the diatomite modified asphlat mixtures were made.These included asphalt technical property,Marshall test,rutting test at high temperature,bend and split test at low temperature and freeze and thaw split test.The results showed asphalt modified by diatomite can improve the performance of asphalt at high temperature and low temperature and antiaging performance,the diatomite modified asphalt mixetures increase resistance to fatigue cracking and rutting and low temperature cracking,and decrease moisture sensitive than unmodified asphalt mixtures.