Physical method for compatibilizing direct coal liquefaction residue modified asphalt

Abstract

The invention relates to a physical method for compatibilizing direct coal liquefaction residue modified asphalt, comprising the following steps: 1) testing various performance indexes of matrix asphalt, DCLR and aromatic hydrocarbon oil; 2) using DCLR as an asphalt modifier, adding different dosages of aromatic hydrocarbon oil, and preparing DCLR modified asphalt under different shear time conditions; 3) using low-temperature ductility as the main control index, supplemented by softening point and needle penetration index, and carrying out primary selection of the DCLR modified asphalt addedwith different dosages of aromatic hydrocarbon oil and at different shear times; 4) adding aromatic hydrocarbon oil into the DCLR modified asphalt according to the optimal dosage and the best shear time based on the results of primary selection, and carrying out dynamic shear rheological test by the use of a dynamic shear rheometer (DSR); and 5) making a Cole-Cole chart according to the DSR test results, and further judging the compatibilization effect of aromatic hydrocarbon oil on DCLR and petroleum asphalt. The physical compatibilization method proposed for DCLR modified asphalt is economical and practical, simple, easy to operate, low in energy consumption, low in cost and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of road construction materials, and relates to a method for improving the compatibility between the direct coal liquefaction residue and the petroleum asphalt by adding a physical compatibilizer to the residue of direct coal liquefaction and the petroleum asphalt. Background technique [0002] Direct coal liquefaction residue (direct coal liquefaction residue, DCLR) is the main by-product that is inevitably produced in the direct coal liquefaction process and accounts for 30% of the total raw coal. It is a kind of high ash, high sulfur, high carbon and high emission. It contains a lot of useful components such as asphaltene, heavy oil, tetrahydrofuran solubles, etc. It can be developed as a road petroleum asphalt modifier. [0003] Jin Zhuoyi introduced the process of DCLR to prepare modified asphalt, and pointed out the feasibility of DCLR as an asphalt modifier. [0004] Zheng Lizhen found that DCLR modified asphal...

AI Technical Summary

Problems solved by technology

[0006] Season and others used SHRP PG, penetration grading system, infrared spectrometer, etc. to analyze the macroscopic properties and microstructure of DCLR and asphalt blends, and found that DCLR has a good effect on improving the high temperature performance of asphalt, but DCLR contains a large amount of THF insoluble substances, resulting in a decrease in the low-temperature performance of asphalt

[0007] There is no research on the application of DCLR in the modification of petroleum asphalt in foreign countries. The domestic research on the application of DCLR in the modification of petroleum asphalt mainly focuses on the performance of different factors (DCLR addition amount, blending temperature, blending method, etc.) on the performance of petroleum asphalt. However, there are few studies on basic scientific issues such as how to improve the compatibility between DCLR and petroleum asphalt, and how to improve the low-temperature performance of DCLR modified asphalt, which seriously restricts the application of DCLR in petroleum asphalt.

Images