Study on Performance of Asphalt Modified by Polyethylene Wax and Ethylene-Propylene Rubber
|School||Beijing University of Chemical Technology|
|Course||Materials Processing Engineering|
|Keywords||Asphalt Polyethylene wax Ethylene-propylene rubber Modification Mechanism General Technical Specifications Rheological properties|
Polyethylene waxes, and ethylene-propylene rubber on asphalt modified Korea SK90 # , respectively, two kinds of modified asphalt penetration, softening point, ductility , elastic recovery , penetration index (PI) and other conventional technical indicators a systematic study , and its rheological properties were more in-depth discussion . On polyethylene wax and ethylene-propylene rubber modified asphalt conventional technical indicators research showed that the two modifiers can significantly reduce the asphalt penetration , softening point and improve ductility . With polyethylene wax content increased from 8% to 16% , modified asphalt 0.939 to 1.877 by the PI values ??, belonging to dissolve - gel-type asphalt, has some elasticity and thixotropy is not very clear , and its high-temperature rutting resistance and low resistance to brittle fracture resistance were significantly improved ; when the polyethylene wax content increased to 20 %, the modified asphalt PI value to 2.407 , more than 2.0 , is gel-type pitch, a clear elastic effect , there is a strong elasticity and thixotropy. For the ethylene-propylene rubber modifier , the content of 8% -12 %, the modified asphalt is soluble - gel-type asphalt ; content greater than 12% are gel-type asphalt modified asphalt . Through the dynamic rheological properties of modified asphalt study found that polyethylene wax and ethylene-propylene rubber blends can make complex shear modulus (G *), storage modulus (G ') and loss modulus ( G \asphalt at high temperature zones at different temperatures viscosity (η) study found that polyethylene wax and ethylene-propylene rubber could significantly increase the viscosity of bitumen to make asphalt and improve their ability to resist the flow , so as to improve its resistance to rutting purposes.