Laboratory evaluation on performance of diatomite and glass fiber compound modified asphalt mixture

Abstract

The purpose of this paper is to investigate the compound effects of diatomite and glass fiber on asphalt mixture. The diatomite and glass fiber compound modified asphalt mixture (DGFMAM) was prepared in laboratory. Performances of DGFMAM were investigated by experimental method. Wheel tracking test, low temperature indirect tensile test, indirect tensile fatigue test (ITFT) and indirect tensile stiffness modulus test (ITSM) were carried out. The statistical analysis of variance (ANOVA) method and statistical regression method were used to evaluate the effects of diatomite and glass fiber on properties of asphalt mixture. Results indicate that diatomite and glass fiber improve the rutting resistance and fatigue properties of control asphalt mixture. Diatomite has a significant effect on the stiffness modulus of asphalt mixture. Disadvantage of diatomite on low temperature deformation property of asphalt mixture is solved by glass fiber. DGFMAM has better travelling performances than the control mixture. It will provide a reference for the design of compound modified asphalt mixture.