Method for preparing positive ion composite modified asphalt

Abstract

The invention provides a method for preparing positive ion composite modified asphalt. The method comprises the steps that firstly, asphalt is heated to 60 DEG C to 100 DEG C, a surface active agent is added into the asphalt, the mixture is stirred for 10 min to 30 min, and modified asphalt is obtained; water is heated to 40 DEG C to 60 DEG C, then a modifier, a blender and an emulgator are sequentially added into the water, and a mixed soap solution is obtained after the mixture is stirred for 5 min to 10 min; the modified asphalt and the mixed soap solution are mixed and mechanically stirred for 30 min to 40 min, the stirring temperature ranges from 80 DEG C to 100 DEG C, the mixture is cooled to 20 DEG C to 25 DEG C after being stirred to be uniform, and the positive ion composite modified asphalt is obtained. According to the method, the raw materials are easy to obtain, the preparation process is simple, pavement performance is good, and all technical indexes are obviously superior to those of common emulsified modified asphalt.

Description

technical field [0001] The invention relates to the technical field of road surface finishing materials, in particular to a preparation method of cationic composite modified asphalt. Background technique [0002] At present, the emulsified asphalt commonly used as ultra-thin wear layer sticky layer oil and stone chip seal layer in highway construction is mostly fast-cracking ordinary emulsified modified asphalt. The viscous layer oil for ultra-thin wear layer requires emulsified asphalt not only to bond the surface layer and the underlying layer, but more importantly, it can partially enter the upper asphalt mixture to play the role of sealing layer. However, ordinary emulsified modified asphalt is often difficult to meet the actual traffic and climate conditions, and its road performance is poor. When ordinary emulsified modified asphalt is used as ultra-thin wear layer sticky layer oil or stone chip seal layer bonding material, often due to its small viscosity, it will fl...

AI Technical Summary

Problems solved by technology

However, ordinary emulsified modified asphalt is often difficult to meet the actual traffic and climate conditions, and its road performance is poor.

When ordinary emulsified modified asphalt is used as ultra-thin wear layer sticky layer oil or stone chip seal layer bonding material, often due to its small viscosity, it will flow when spraying a large amount, so that the emulsified modified asphalt cannot be sprayed or a very small amount Into the hot mix mixture, resulting in poor sealing effect, serious water seepage on the road surface, and road surface diseases such as shifting, peeling, pits, cracks, etc. will appear shortly after opening to traffic

Even if the viscosity of some emulsified modified asphalt meets the requirements of use, the high temperature, low temperature, elastic recovery and other indicators of the modified asphalt after demulsification cannot meet the technical requirements of ultra-thin wear layer, and the above-mentioned pavement diseases will still appear in the end

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