Carboxyl modified graphene oxide modified rubber asphalt mixture and preparation method thereof

Abstract

The invention provides a carboxyl modified graphene oxide modified rubber asphalt mixed material and a preparation method thereof. The carboxyl modified graphene oxide modified rubber asphalt mixed material comprises 5.34-10.23 parts of pavement petroleum asphalt, 0.42-1.21 parts of tyre rubber powder, 100 parts of a mineral stone material and 1-2 parts of carboxyl modified graphene oxide. The preparation method comprises the following steps of: (1) adding 0.42-1.21 parts of tyre rubber powder into 5.34-10.23 parts of pavement petroleum asphalt and stirring the mixture at a first temperature to obtain rubber asphalt; (2) heating 100 parts of mineral stone material to a second temperature, then adding 1-2 parts of carboxyl modified graphene oxide and stirring to obtain a mixed material; and (3) adding 6-11 parts of rubber asphalt in the mixed material and stirring e to obtain a product. The asphalt mixed material is prepared by combining a dry method and a wet method, so that the obtained asphalt mixed material has the characteristics of good stickiness, storage stability, high-temperature rut resistance, construction stability and etc.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a carboxyl-modified graphene oxide-modified rubber-asphalt mixture and a preparation method thereof. Background technique [0002] Rubber asphalt refers to the modified asphalt cementing material obtained by the tire rubber powder content of more than 15%, under the conditions of high temperature and full mixing, and asphalt swelling reaction. 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. And there are still deficiencies in 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 ...

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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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