Study On The Preparation And Performance Of Asphalt Modified By Coal Liquefaction Residue

China is the fastest-growing developing country in the world, the rapid economicdevelopment leads to energy consumption. There is a plenty of coal resources in ourcountry.In order to alleviate the energy crisis, we can apply the technology of directlyliquefacted Coal. Large amounts of residue is made by the technology of directly liquefactedCoal. Studies have found that residue contains asphaltenes and oil content, and the asphalt issimilar in composition. Residue has the potential to replace or modify asphalt. Therefore,based on the researches of relevant references and experiences at home and abroad, themethod of melt blending experiments are carried out, and the paper develops the researcheson performances for Coal direct liquefaction residue composite modified asphalt and itsmixture.The test of Penetration, softening point and ductility was carried out on the modifiedasphalt, and the results show that its performance is close to5%SBS modified asphalt withmixed with coal liquefaction residue and purification residue in the asphalt blend. Throughthe experiment，we can be sure that the best dosage range is about7%～10%coal residue,15%～20%purification residue. At the same time, Fluorescence microscope analysisshowed that the residue as a modifier, dissolved into asphalt preferably can form a stablesystem if we prolong stirring time.Viscosity test with Brinell viscometer showed that the viscosity has fallen with theincrease of the temperature when mixed with different amount of modifier preparation ofmodified asphalt. Owing to the increment of added modifier, the viscosity of the modifiedasphalt are on the rise. Through the viscosity-temperature curve drawing, the mixingtemperature is determined as162℃~165℃, the compacted temperature is determined as139℃~148℃.The paper adopts match ratio AC-13C to determine the optimal oilstone ratio and teststhe pavement performances of two kinds of modified asphalt mixture and ordinary asphaltmixture. The optimum proportion respectively was4.42%,4.54%and4.64%. The results ofcomparative analysis shows that，at the same situation, no matter in the mineral or in the gradation, the modified asphalt mixture’s high-temperature stability, low-temperature stabilityas well as the water stability can all be improved obviously.