Asphalt modifier for improving low temperature ductility and preparation method thereof

Abstract

The invention relates to a modifier for an asphalt pavement material, in particular to an asphalt modifier for improving low temperature ductility and a preparation method thereof. The asphalt modifier for improving the low temperature ductility comprises two components, namely plant fatty acid and phosphate in a weight ratio of (8.5-9.5):(1-2). Compared with the traditional rubber oil, the asphalt modifier has the advantages of small using amount, low cost, good effect and environment friendliness.

Description

technical field [0001] The invention relates to a modifier for pavement asphalt materials, in particular to an asphalt modifier for improving low-temperature ductility and a preparation method thereof. Background technique [0002] At present, there are two types of modifiers used for highway asphalt pavement: one is the modifier that increases the softening point of the asphalt, which can prevent the sun from being exposed to the sun in summer, such as SBS (thermal rubber) and waste tire rubber powder; the other One is a modifier that improves the low temperature ductility of asphalt. [0003] The asphalt modifier for improving low-temperature ductility is mainly used in highway asphalt pavement, which can prevent asphalt pavement from cracking at low temperature in winter and prolong the service life of asphalt pavement. [0004] Usually, in order to improve the low-temperature ductility of asphalt, rubber oil (an aromatic hydrocarbon) is added to asphalt, but this rubber...

AI Technical Summary

Problems solved by technology

[0005] 1. The effect of improving the low-temperature ductility of asphalt is not good; according to JTGF40-2004 "Technical Specifications for Highway Asphalt Pavement Construction", modified asphalt is based on different regional characteristics, and the softening point is 45-60 ° C. The low-temperature ductility should not less than 20-50cm

It is often difficult to meet the requirements of construction specifications when traditional modifiers are used alone;

[0006] 2. In order to achieve higher low-temperature ductility, it is added in a large amount in asphalt, and the amount of rubber oil is usually 3-6% / t modified asphalt; in addition, in order to make the modified asphalt products meet the requirements of low-temperature ductility, It is also necessary to increase the amount of other modifiers such as SBS, which is not conducive to cost reduction;

[0007] 3. Rubber oil is a petroleum product, which is a non-renewable raw material, and a large amount of consumption is not conducive to environmental protection