A kind of asphalt mixture prepared by using coal direct liquefaction residue and preparation method thereof

Abstract

The invention discloses an asphalt mixture prepared from direct coal liquefaction residues and a preparation method thereof. The asphalt mixture comprises asphalt, an asphalt mixture additive, an aggregate and ore powder. The preparation method comprises preparing an asphalt mixture additive from direct coal liquefaction residues, a cross-linking agent, a promoter, a binder and a plasticizer, simultaneously adding the asphalt mixture additive and molten asphalt into the preheated aggregate, carrying out uniform stirring to obtain a mixture, adding ore powder into the mixture, and carrying out uniform stirring to obtain the asphalt mixture. The asphalt mixture prepared from direct coal liquefaction residues utilizes the asphalt mixture additive is prepared from coal-to-oil wastes as main raw materials so that 15% or more of an asphalt raw material is saved. The asphalt mixture with the asphalt mixture additive has performances reaching to or exceeding physical indexes of the modified asphalt mixture, has dynamic stability of 8064 times per millimeter and has high track resistance.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to an asphalt mixture prepared by utilizing coal direct liquefaction residue and a preparation method thereof. Background technique [0002] As the international energy competition becomes increasingly fierce, oil prices continue to break through record highs. Out of the demand for energy strategic reserves, the development of alternative oil projects worldwide is also accelerating. The status quo of my country's energy structure is that coal resources are relatively abundant, while oil and natural gas are relatively scarce. With the rapid development of the national economy, my country's consumption of petroleum products continues to grow, greatly exceeding the growth rate of crude oil production in the same period. Domestic production of petroleum products cannot meet the demand, resulting in an increase in my country's petroleum imports year by year. Making full use ...

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Problems solved by technology

[0004] The Chinese Invention Patent No. 200610012547.9 discloses a road asphalt modifier. In this invention, coal liquefaction residue is directly used as a road asphalt modifier. When preparing modified asphalt, the direct coal liquefaction residue modifier accounts for the modified asphalt modifier. 5-10% of the weight, the invention simply and optimally utilizes the coal liquefaction residue directly, but the amount of the coal liquefaction residue added as a modifier is very small, and when the coal liquefaction residue content increases, due to the brittleness of the asphalt, the low temperature Poor performance, difficult to meet road performance requirements

The Chinese patent No. 201010216320.2 discloses a composite modified asphalt of direct coal liquefaction residue, which directly prepares modified asphalt from the direct coal liquefaction residue by adding oil and colloid to the molten direct coal liquefaction residue. The production process of modified asphalt is simple and the price is low. However, since the composition of direct coal liquefaction residue is very different from that of asphalt, it is difficult to directly prepare modified asphalt from coal direct liquefaction residue, and its performance indicators are difficult to meet the requirements of modified asphalt. The Chinese patent No. 201010198795.3 discloses a method for preparing asphalt concrete pavement anti-rutting agent from coal direct liquefaction residue, which pulverizes coal direct liquefaction residue, petroleum asphalt and polyethylene respectively, and then mixes them according to a certain weight ratio. Finally, the mixture is extruded and granulated to obtain an anti-rutting agent in the form of 2-5mm solid particles. The anti-rutting agent of this invention can obviously improve the anti-rutting performance of asphalt pavement, but the anti-rutting agent of this invention needs to use petroleum asphalt as a raw material , and cannot improve other properties of asphalt concrete

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