Nanomaterial modified rubber asphalt mixture and preparation method thereof

Abstract

The invention provides a nanometer material-modified rubber asphalt mixture and a preparation method thereof. The nanometer material-modified rubber asphalt mixture comprises the following components in parts by weight: road petroleum asphalt, tire rubber powder, mineral stones and nanometer materials. The preparation method of the nanometer material-modified rubber asphalt mixture comprises the following steps: (1) adding the tire rubber powder into the road petroleum asphalt and stirring at a first temperature to obtain rubber asphalt; (2) adding the nanometer materials into the rubber asphalt, stirring at a second temperature, shearing and re-stirring to obtain nanometer-modified rubber asphalt; (3) heating the mineral stones to a third temperature, successively adding the nanometer-modified rubber asphalt and stirring to obtain the asphalt mixture. The nanometer material-modified rubber asphalt mixture and the preparation method thereof provided by the invention have the benefit that the nanometer materials are adopted for modification in raw materials, so that the prepared nanometer material-modified rubber asphalt mixture has the characteristics of good high-temperature rutting resistance, adhesion property and aging resistance, and the like.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a nano-material modified rubber asphalt mixture and a preparation method thereof. Background technique [0002] Rubber asphalt refers to the modified asphalt cementing material obtained by swelling and reacting with asphalt with a tire rubber powder content of more than 15% under high temperature and full mixing conditions. Due to the use of recycled tires as the main material for modification, it has a cost advantage compared to styrene-butadiene block copolymer (SBS) modified asphalt. , There are still deficiencies in the construction performance. [0003] In order to improve the overall performance of rubber asphalt, other modifiers can be added to rubber asphalt for modification. The existing technology of applying rubber powder to asphalt pavement is mainly divided into two categories: wet method and dry method. The wet method refers to the use of a mo...

AI Technical Summary

Problems solved by technology

[0005] Due to the limitation of material selection and other factors, the rubber asphalt mixture prepared by the above method is still unsatisfactory in terms of adhesion and anti-rutting performance

The main reason for the lack of adhesion performance is that rubber asphalt has added more than 15% of rubber powder, which makes the asphalt too viscous, so it is difficult to coat the stone surface; the main reason for the poor anti-rutting performance is the adhesion of rubber asphalt and stone After the performance is reduced, the high temperature performance will be reduced. In addition, the asphalt content added to the rubber asphalt mixture is relatively high, which is about 50% higher than that of ordinary asphalt mixture. The mixture corresponding to the higher asphalt content has poor high temperature performance.

If general modifiers are added to rubber asphalt, it will lead to higher viscosity of rubber asphalt. Although there is a patent to add it by dry method, it will still increase the construction difficulty of rubber asphalt mixture.

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