Paving asphalt concrete additive and preparation method thereof

Abstract

The invention provides a method for preparing a paving asphalt concrete additive through direct liquefaction of residues with coal. The paving asphalt concrete additive is prepared through the following steps: adding an appropriate amount of plasticizing agent, coupling agent and rubber powder during direct liquefaction of the residues with the coal, high-temperature melting, mixing and the like. When being added, the additive can substitute 10-40 percent of total asphalt in the paving asphalt concrete without changing the proportion of the components of the paving asphalt concrete, and can not affect the use performance of the road adopting the paving asphalt concrete, but can improve part of the performances of the road. Moreover, the invention can reduce the cost of the paving asphalt concrete, and realize the purposes of transforming the residues into valuable resources, saving the energy and reducing the emission.

Description

technical field [0001] The invention belongs to the technical field of using coal chemical solid waste in road building materials, and in particular relates to a road asphalt concrete external admixture compounded with coal direct liquefaction residue and a preparation method thereof. Background technique [0002] As we all know, in the coal-to-liquids technology, the direct coal liquefaction technology has begun large-scale industrial application in my country, but the treatment of the residue produced in the process of direct coal liquefaction has not been well resolved. [0003] Due to the world energy crisis, the price of oil and its related products keeps rising, which leads to the continuous increase of the price of asphalt and the continuous increase of the cost of road construction materials. Traditional asphalt concrete is made of high-quality asphalt and aggregates, which is not only costly, but some properties often cannot fully meet the road performance requireme...

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Problems solved by technology

[0004] In the field of research on the use of coal direct liquefaction residues as road construction materials, we found that in the prior art, when the amount of coal direct liquefaction residues added increases, the performance of the base asphalt will be greatly affected, making the cost of road asphalt concrete materials Difficult to lower

For example: Chinese patent application (Patent No. 200610012547.9) discloses a road asphalt modifier and its application method, which is to crush the coal direct liquefaction residue to below 100 mesh, and press the coal direct liquefaction residue with asphalt in the range of 100-250°C Accounting for 5-30% by weight of modified asphalt and mixing evenly, only when adding less than 7% by weight of coal liquefaction residue in the obtained modified asphalt (Wang Zhaixia, Yang Jianli, Liu Zhenyu. Preliminary evaluation of anti-corrosion effect. Journal of Fuel Chemistry, 2007, 35(1):109-1120), the obtained modified asphalt has the use value, and when the residue content is increased, the low-temperature performance is not good due to the brittleness of the asphalt , it is difficult to meet road performance requirements

[0005] Chinese patent application (Patent No. 200710178082.9) discloses a method of preparing modified asphalt by directly liquefying oil residue from coal, directly liquefying oil residue in the molten state at 150-280°C and matrix asphalt in the molten state at 100-180°C Stir evenly at 150-280°C to form a melt to obtain modified asphalt. The outstanding problem of this method is that the base asphalt experiences high temperature during mixing, which easily causes the aging of the base asphalt, and there is also the problem of low residue content. question

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