Pavement asphalt modifier, modified pavement asphalt, as well as preparation method thereof and asphalt mixture

Abstract

The invention relates to the field of direct coal liquefaction, and discloses pavement asphalt modifier, modified pavement asphalt, a preparation method thereof and asphalt mixture. Based on 100 weight parts of direct coal liquefied asphalt, the content of petroleum heavy oil components is 0.5-9.5 weight parts. The pavement asphalt modifier has relatively lower cost; and the modified pavement asphalt prepared by adopting the pavement asphalt modified has the softening point being higher than 75 DEG C, which is suitable for the high-temperature environment in southern areas. The asphalt mixtureprepared from the pavement asphalt modifier or modified pavement asphalt has relatively high water stability and rut resistance.

Description

technical field [0001] The invention relates to the field of direct coal liquefaction, in particular to a road asphalt modifier and a preparation method thereof, a modified road asphalt prepared from the road asphalt modifier and a preparation method thereof, and the modified road asphalt or The asphalt mixture of the road asphalt modifier. Background technique [0002] How to efficiently and rationally utilize the coal direct liquefaction residue (also known as "coal direct liquefaction bitumen") is the bottleneck restricting the development of current coal direct liquefaction technology. The waste of precious resources reduces the impact on the environment, and can effectively improve the economics of the direct coal liquefaction process and promote the development of direct coal liquefaction technology. [0003] With the development of my country's highway transportation, especially high-grade highways, the mileage of traffic has increased year by year, and the demand an...

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Problems solved by technology

[0008] Although the technical solutions of the above three patent documents can all produce modified road asphalt that meets the technical indicators of the industry, the solutions still have the following problems: 1) After the polymer is pre-dissolved in heavy oil, the viscosity of the system is too high, It is difficult to carry out material transportation and large-scale production cannot be carried out; 2) The mixture of polymer and heavy oil needs to be mixed at a temperature higher than the softening point of coal direct liquefaction bitumen to prepare modifier, and the higher mixing temperature causes polymer molecules Degradation affects the effect of the polymer, which can only be compensated by increasing the amount of the polymer, resulting in higher costs; 3) The addition of too much heavy oil in the above system causes the softening point of the modified asphalt to be low (less than 75 ℃), affecting its use in southern high-temperature regions; 4) pretreatment of liquefied residues with oxidants or fly ash will increase process complexity and operating costs, which is not conducive to industrial production

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