Preparation And Properties Of High Viscosity And Anti-striping Modifier

Asphalt pavement(AC)has become the predominant pavement structure in the world due to its distinguished features,e.g.,comfortable driving,facilitating maintenance and recycling.However,owing to the increasing traffic volume and vehicle loads channeled traffic,climate factors,etc.rutting and water damage has become the most common distresses of AC which reduced both the service performance and its life span.Therefore,in the area of research and application,how to improve simultaneously the surface rutting resistance and water stability of AC remains to be one of the unsolved tough and hot issues.In this paper,the High Viscosity and Anti-striping(HVAS for short)asphalt modifier has been manufactured in laboratory in order to improve the rutting resistance and water stability of asphalt mixture.First,the grafted polyethylene(PE-MAH for short)validated by infrared spectrum method was produced by melt grafting.The high viscosity asphalt modifier was developed combining with SBS,petroleum resin and PE-MAH.Second,the dosage of each component was optimized based on the testing results such as penetration,softening point,ductility and viscosity at 60 ℃.The anti-stripping agent was made by blending with AMP,epoxy resin,dioctyl phthalate and polyamide through orthogonal experiment design.In addition,an innovative testing and evaluating method of adhesion for asphalt and coarse aggregate was put forward.Finally,the HVAS asphalt modifier was obtained by mixing the high viscosity asphalt modifier and anti-stripping agent.And the mixed proportion was determined according to the variation trend of conventional performance test results.As the dosage of high viscosity asphalt modifier was 12%,the softening point of modified asphalt could reach above 80℃ the viscosity at 60℃ could reach above 30 kPa.s which is an indicator of favorable stability at high temperature.When the dosage of anti-stripping agent was 1%,the adhesion rate was 97.3%after boiling for 10 minutes in water.When 12%HVAS modifier was blended,the softening point of the resulting modified asphalt,the dynamic stability of asphalt mixture,Marshall immersion residual stability,freeze-thawing splitting residual strength ratio and ultimate flexural strain at the temperature of-10℃ could attain or higher than 80℃,8000 times/mm,85%,80%,and 2500μs,respectively.The findings indicate that the laboratory manufactured asphalt modifier possesses preferable high temperature stability and water stability.