Performance evaluation of self-reactive high modulus asphalt
LI Bingnan
GENG Litao
PENG Jialin
WANG Fengjiao
XU Wanlei
Abstract：To address the issues of low additive utilization poor low temperature and fatigue performance in high modulus asphalt mixture,for direct application,a self-reactive high modulus asphalt and asphalt mixture are prepared using low-density ethylene-styrene copolymer-based high-modulus agents,and their technical performance is evaluated.Three kinds of self-reactive high modulus asphalt are prepared with rather lower content(6%,7% and 8%)of low-density ethylene-styrene copolymer as high modulus agent by pure mixing process,then the dispersion state and modification mechanism of high modulus agent are analyzed based on microscopic and physicochemical properties.The reasonable content of high modulus agent is selected based on the results of macroscopic performance test.Furthermore,the high modulus asphalt mixture with the preferred modifier content is prepared and its pavement performance is evaluated by laboratory tests.Results show that the modification process of self-reactive high modulus asphalt is a combination of the physical action of the high modulus agent and the chemical reaction between the asphalt binder and the modifier.The preferred high modulus agent content is 7%(by mass of the asphalt),which is 50%-80% of the modifier content in the dry-process.In this condition,the microscopic dispersion effect of the high modulus agent and the low-temperature performance of high modulus asphalt are desirable,and the PG high-temperature grade of high modulus asphalt is improved by one grade compared with that of the conventional high modulus asphalt.In addition to its superior high temperature performance,the high modulus asphalt mixture with optimum modifier content exhibited an 18%improvement in low-temperature destructive strain relative to conventional high modulus asphalt mixture with dry-process,while also achieving a 2 to 3 times extension in fatigue life.
Keywords：low-density ethylene-styrene copolymerhigh modulus agentself-reactive high modulus asphaltmicroscopic propertyrheological characteristicspavement performance
Publication Date：2026-01-31
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 73-79,95 )