Polyurethane asphalt concrete as well as preparation method and application thereof

Abstract

The invention discloses polyurethane asphalt concrete prepared from aggregate, diluted asphalt and polyurethane prepolymer which serve as raw materials, wherein the aggregate is basalt, diabase or limestone; the diluted asphalt is a mixture formed by diluting road petroleum asphalt and gasoline or diesel at a weight ratio of 100:(18-100); and the polyurethane prepolymer is prepared by reacting isocyanate with a polyalcohol compound, a catalyst and a plasticizer. The polyurethane asphalt concrete serving as cool-mixed and cool-spread type asphalt concrete is applied to pavement or repair of an asphalt road surface; compared with the conventional hot state technology for a hot-mixed and hot-repaired asphalt mixture, the polyurethane asphalt concrete has the advantages that the energy is saved, emission of a large amount of greenhouse gas and emission of toxic and harmful gas during asphalt heating are reduced, the surrounding environment is protected, and the environment pollution is reduced; and furthermore, the polyurethane asphalt concrete is operated easily and high in efficiency and cannot be limited by a transparent condition, a repair dispersion condition and the like during production and construction.

Description

technical field [0001] The invention relates to an asphalt concrete, in particular to a polyurethane asphalt concrete and its preparation method and application. Background technique [0002] In recent decades, with the continuous improvement of road grades, higher requirements have been put forward for asphalt materials, which has prompted further research work. Various modified asphalts have emerged, such as adding rubber, resin, sulfur and other polymers to asphalt to improve the road performance of asphalt concrete. However, traditional asphalt mixtures are hot-mixed and hot-paved materials. Viscous asphalt is used as a binder, and it is necessary to mix asphalt and mineral materials in a hot state and pave in a hot state. Obviously, the required energy consumption is high, the impact on the environment is great, and the corresponding material cost has also increased. Therefore, many researchers are devoting themselves to finding alternatives to hot mix production. Un...

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Problems solved by technology

[0003] However, in recent years, the molding products that have been widely promoted and applied in the market are all solvent-based cold-mix asphalt mixtures, while the application of reactive-type cold-mix asphalt mixtures is still blank in the domestic and foreign markets.

Although traditional cold-mix asphalt mixtures can achieve mixing construction at room temperature to a certain extent and reduce energy consumption, compared with hot-mix asphalt materials, the volatilization of solvents causes environmental pollution, poor road performance, and poor durability. , can no longer meet the current requirements for asphalt materials

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