Directly injected asphalt modifier, dry modified asphalt mixture and preparation method thereof

Through the unique formulation design and preparation process of granular direct-injection asphalt modifier, the problems of dust pollution and material segregation have been solved, achieving uniformity and high performance of asphalt mixtures, and improving pavement durability and construction efficiency.

CN121450119BActive Publication Date: 2026-06-05SHANXI JIBEI HIGHWAY MAINTENANCE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANXI JIBEI HIGHWAY MAINTENANCE
Filing Date
2026-01-07
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing direct-injection asphalt modifiers suffer from dust pollution, material segregation, and poor mixture uniformity during application, affecting road performance and the construction environment.

Method used

A granular direct-injection asphalt modifier is used, which combines polyurethane with mineral powder at the microscale to form homogeneous composite particles. This achieves the simultaneous addition of mineral powder and modifier, avoiding the step of adding mineral powder later, simplifying the operation and improving the uniformity of the mixture.

Benefits of technology

It significantly improves the homogeneity and long-term durability of the pavement structure, improves the construction environment, reduces the risk of dust pollution, and enhances the high-temperature resistance to rutting, low-temperature resistance to cracking, and resistance to water damage of asphalt mixtures.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a direct injection type asphalt modifier, a dry modified asphalt mixture and a preparation method thereof, and belongs to the technical field of new road materials, and is used for solving the problems of dust pollution, material segregation, poor mixture uniformity and damaged road performance caused by the "post-added mineral powder" process in the application process of the existing direct injection type asphalt modifier. The direct injection type asphalt modifier is in a granular form, and comprises the following components in parts by weight: 10-20 parts of polyurethane, 1-5 parts of asphalt and 50-80 parts of mineral powder; the polyurethane is obtained by mixing and reacting a polyurethane prepolymer and a polyol component, and the molar ratio of NCO groups to OH groups in the polyurethane is 1.01-1.1:1. The direct injection type asphalt modifier combines the polymer component (polyurethane) for modification and the mineral powder component for filling, can perform the dual functions of "asphalt modification" and "mineral powder filling", and avoids the step of "post-added mineral powder".
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