Preparation method of composite anti-aging agent based on thermo-oxidative aging of asphalt components

Abstract

The invention is a method for compounding asphalt composite anti-aging agents based on component levels, which belongs to the technical field of road asphalt pavement durability, and solves the problems of single components of asphalt anti-aging agents, no compounding technology, and lack of scientific basis for compounding schemes. Comprehensive anti-aging effect is poor. This method selects asphalt samples, separates asphaltene, saturated components, aromatic components, and colloids in sequence, and prepares various components of asphalt; then, respectively optimizes anti-aging agents that match the thermal-oxidative aging characteristics of each component of asphalt, And determine its addition amount; secondly, according to the content of each component in the asphalt, preliminarily design the anti-aging agent compounding scheme, investigate the effect of the prepared compound anti-aging agent on asphalt thermo-oxidative aging improvement, according to the anti-aging agent compounding The scheme was initially optimized; finally, the influence of compound anti-aging agent on the road performance of asphalt and its mixture was evaluated, and the compounding scheme of anti-aging agent was further optimized to prepare high-efficiency compound anti-aging agent to improve the durability of asphalt pavement.

Description

technical field [0001] The invention relates to a method for preparing a composite anti-aging agent based on the thermo-oxidative aging of each component of asphalt, and belongs to the technical field of asphalt pavement durability. Background technique [0002] With the rapid development of our country's economy, the traffic volume is increasing day by day, and the vehicle speed is gradually increasing, which puts forward higher requirements for road surface performance. During the use of asphalt pavement, due to the combined effects of oxygen, water and sunlight, asphalt will undergo aging reactions such as photo-oxidative aging and thermal-oxidative aging, and become hard and brittle. In the environment of sudden drop in temperature in winter and repeated temperature rise and drop, it is easy to cause cracks in the asphalt pavement; in the rainy season, water seeps into the interface between asphalt and aggregate, which will reduce the adhesion of the asphalt and fall off...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing a composite anti-aging agent based on the thermo-oxidative aging of each component of asphalt. According to the short-term thermal-oxidative aging performance of each component of asphalt, a high-efficiency composite anti-aging agent is prepared through a multi-component compounding technology to solve the current problem of asphalt anti-aging. Aging agent components are single, no compounding technology is used, the compounding scheme lacks scientific basis, and the comprehensive anti-aging effect is poor, so as to develop a compound anti-aging agent to reduce thermal oxygen aging of asphalt and improve the durability of asphalt pavement

[0010] In view of the problems that the current asphalt anti-aging agent has a single component, no compounding technology, lack of scientific basis for the compounding scheme, and poor comprehensive anti-aging effect, the present invention goes deep into the level of the asphalt components, from the thermal oxygen aging of each component of the asphalt Starting from the characteristics, it provides a compounding method of asphalt composite anti-aging agent based on component level, so as to improve the anti-aging effect of asphalt and the durability of asphalt pavement