Waterborne environment-friendly polyurethane modified emulsified asphalt cold-mixed material and preparation method thereof

Abstract

The invention discloses a waterborne environment-friendly polyurethane modified emulsified asphalt cold-mixed material and a preparation method thereof. The preparation method comprises the steps of: compositely modifying matrix emulsified asphalt: an emulsified asphalt modifier is slowly added into the matrix emulsified asphalt, the stirring time is 5 min, the stirring rotating speed is 400-500 r / min till the color is uniform and no white floating exists on the surface, and a pre-finished product A is formed; slowly adding waterborne polyurethane into the pre-finished product A while stirring for 10 minutes at the stirring speed of 600-700 r / min to form a polyurethane modified normal-temperature composite emulsion B; mixing and stirring the high-stiffness mixed additive and the aggregate for 20 seconds, adding purified water, and stirring for 20 seconds to form a pre-finished product C; and uniformly spraying the polyurethane modified normal-temperature composite emulsion B onto the pre-finished product C, and stirring for 30 seconds to obtain the water-based environment-friendly polyurethane modified emulsified asphalt cold-mixed material, which has the advantages of high adhesive force, wear resistance, no peeling, balanced rigidity and toughness, simple and diversified processing and high cost performance compared with the traditional modified emulsified asphalt.

Description

technical field [0001] The invention relates to the technical field of asphalt production, in particular to a water-based environmentally friendly polyurethane modified emulsified asphalt cold mix and a preparation method thereof. Background technique [0002] With the rapid development of the road network, the demand for road protection and repair is also increasing. At present, more and more quantities are required for road preventive materials and repairing cold patch materials. However, the current material suffers from the following problems: [0003] (1), in the cold winter, the material is prone to brittle cracks, reducing the service life; [0004] (2), the hardness of the material itself is not enough, the anti-rutting performance is poor, and the service life is short; [0005] (3) The production of materials is cumbersome, excessive energy consumption during production, time-consuming and labor-intensive, and inconvenient construction. [0006] Therefore, how ...

AI Technical Summary

Problems solved by technology

[0003] (1), in the cold winter, the material is prone to brittle cracks, reducing the service life;

[0004] (2), the hardness of the material itself is not enough, the anti-rutting performance is poor, and the service life is short;

[0005] (3), cumbersome material production, excessive energy consumption during production, time-consuming and labor-intensive, inconvenient construction and other defects

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