Study On Preparation And Properties Of Asphalt Toughened And Reinforced By SBS Coupling With Epoxy Resin

In low temperature environment,asphalt is easy to become brittle,resulting in cracks on the pavement.With the passage of time and rain,potholes will be formed,affecting travel.In high temperature environment,asphalt becomes soft,which will lead to deformation easily,eventually forming ruts,causing damage to the pavement.Therefore,it is very important to improve the high and low temperature performance of asphalt,that is,the toughening and strengthening of asphalt has great research significance.In view of such defects,in this study,asphalt toughened and reinforced by SBS coupling with epoxy resin was prepared based on the excellent high temperature performance of epoxy resin and the high toughness of styrene-butadiene-styrene block copolymer(SBS).However,the amount of SBS modifier,the selection of basic asphalt and the type of SBS modifier have a great impact on the performance of the prepared asphalt toughened and reinforced by SBS coupling with epoxy resin.Based on this,the high and low temperature performance of asphalt was studied by optimizing the amount of SBS modifier and the material composition.In this paper,the content of SBS modifier and material composition were studied.First of all,through the successful preparation of SBS modified asphalt,the influence of SBS content on the high temperature performance,rheological properties,microstructure and dynamic mechanical properties of the modified asphalt was studied by using softening point tester,Brinell rotary viscometer,optical microscope and dynamic shear rheometer to determine the optimal amount of SBS to pave the way for subsequent tests.Secondly,the matrix asphalt and SBS modifier were optimized,asphalt toughened and reinforced by SBS coupling with epoxy resin was successfully prepared by adding epoxy resin.The effects of different types of matrix asphalt,different structures and molecular weight SBS modifiers on the properties of asphalt toughened and reinforced by SBS coupling with epoxy resin were studied.The results showed that the high temperature performance of asphalt was significantly improved by adding SBS.When the content of SBS was 5%,the modified asphalt had excellent comprehensive performance.When the SBS modifier is linear YH791 H and the dosage is 5%,the comprehensive performance of asphalt toughened and reinforced by SBS coupling with epoxy resin prepared with Shuanglong 70 basic asphalt is the best.When the base asphalt is Zhenhai 70,the comprehensive performance of asphalt toughened and reinforced by SBS coupling with epoxy resin prepared with star LG501 is the best.When the epoxy resin content is 2%,its softening point can reach 122 ℃.Moreover,the strength and toughness of the modified asphalt are greatly improved after the addition of epoxy resin.Its tensile strength can be increased from 0.53 MPa to 1.03 MPa,and its viscosity and toughness can be increased from 1.99(N · m)to 3.80(N · m).The traditional epoxy asphalt reacts with epoxy resin and curing agent to form a stable three-dimensional network structure.The cured epoxy asphalt is brittle,has poor compatibility,and does not melt at high temperature,which is not conducive to recycling.asphalt toughened and reinforced by SBS coupling with epoxy resin is insoluble and fusible for the first time successfully prepared in this study.A small amount of epoxy resin acts as a bridging agent,building a network of asphaltene and long molecular chain SBS(molecular weight up to 100000),while the light components are dispersed in the network.This multiple network molecular structure design endows the modified asphalt with excellent high-temperature storage stability,high strength,high toughness and thermoplasticity.The structure breaks through the disadvantage of non melting of traditional epoxy asphalt,innovatively realizes the recycling of epoxy asphalt,and provides guidance for the application of environmental protection and renewable projects.