Diatomite Modified Asphalt Research

This paper selects diatomite as inorganic modified material for asphalt, and deeply researches the mechanics performance, microcosmic mechanism and consistency of diatomite-modified asphalt and the performance of pavement of diatomite-modified asphalt mix by a great deal tests. It brings forward the mix design method of diatomite-modified asphalt and summarizes the construction technics. This paper offers academic elements for the widely application of diatomite-modified asphalt in our country.This paper discusses the mineral resources distributing, mineral characteristic and manufacture method of diatomite, and analyses the difference between it as filling material or modified material for asphalt. It processes the contradistinctive research about penetration, softening point, ductility, PI, T₈₀₀, T_1,2 and the "three standard" test after the RTFOT aging among different content and diatoms diatomite-modified asphalts, and analyses the influence of asphalt's performance at high temperature and low temperature and the temperature susceptibility by diatomite. This paper researches the consistency by eduction and SEM test, analyses the modality and mechanism of diatomite in asphalt by SEM, IR and DSC microcosmic test, and considers that diatomite forms a steady and symmetrical mixed system in asphalt. This paper carries Marshall test and other kinds of performance tests of pavement on different content and species diatomite-modified asphalt mixes, and brings forward a mix design method of diatomite-modified asphalt by investigation of surface theory. At the same time, this paper summarizes the pivotal technic of production and construction of diatomite-modified asphalt pavement according to the trial road project. Furthermore, this paper considers that diatomite have obviously integrated advantage of economic benefit, biggish application value and research significance by economy analysis.