高模量橡胶改性沥青及其混合料性能研究

Study on properties of high modulus rubber-modified asphalt and its mixture

高模量沥青及其混合料是解决沥青路面重载交通及长大陡坡路面车辙等问题的重要工程材料。采用活化橡胶颗粒制备的橡胶改性沥青具有优异的高低温性能及抗车辙性能。本文分析了克炼30#A级和克炼50#A级低标号硬质沥青、克炼70#A级沥青及橡胶改性沥青性能,并采用两种级配类型(ATB-25和SUP-20)来评价其高低温性能及水稳定性能。结果表明,橡胶改性沥青PG分级为76-28,在相同温度下,橡胶改性沥青复数剪切模量及车辙因子最大;随着温度的降低,四种沥青的蠕变劲度均显著增大,但橡胶改性沥青的增大趋势最慢,橡胶改性沥青的m值最大;两种级配类型下,橡胶改性沥青具有最大的动稳定度及弯曲劲度模量,同时有较好的水稳定性能。

High modulus asphalt and its mixture are important engineering materials to solve the problems of heavy traffic on asphalt pavement and rutting on long and steep slopes.The rubber-modified asphalt prepared by activated rubber particles has excellent high and low temperature performance and rutting resistance.In view of this,this paper analyzes the performance of Kelian 30#A and 50#A low grade asphalt,Kelian 70#A asphalt and rubber-modified asphalt.Two gradations ATB-25 and SUP-20 are used to evaluate the high and low temperature performance and water stability performance.The results show that the PG classification of rubber-modified asphalt is 76-28,and the complex shear modulus and rutting factor of rubber-modified asphalt are the highest at the same temperature.With the decrease of temperature,the creep stiffness of the four types of asphalt significantly increases,but the increasing trend of rubber-modified asphalt is the slowest,and the m value of rubber-modified asphalt is the highest.Under the two gradations,the rubber-modified asphalt has the highest dynamic stability and bending stiffness modulus,as well as good water stability performance.