Effect of Asphalt Mortar Composition on Dynamic Response of Asphalt Mixture

Shaobo Ren,Peng Zou,Lixia Ma,Like Zhu,Meng Liu

doi:10.1051/matecconf/20166707019

Shaobo Ren, Peng Zou + Show 3 more

Open Access

https://doi.org/10.1051/matecconf/20166707019

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Abstract

To investigate the effect of mortar composition on visco-elastic response of asphalt mixture, The Asphalt Mixture Performance Test (SPT) was conducted on several asphalt mixtures for different ratios of filler to asphalt (F/A) , fiber dosage and proportion of cement instead of mineral powder. The effect of F/A, fiber dosage and and proportion of cement replacement on visco-elastic mechanical parameters (dynamic modulus and phase angle) of asphalt mixtures are analyzed. The results indicate that the dynamic modulus of asphalt mixtures increases first and then decreases with the increases in F/A and fiber dosage. And the more significant differences in these dynamic moduli appear at the higher the load frequency. The asphalt mixture with the lowest F/A has the biggest phase angle, and the difference in the phase angles of those asphalt mixtures is not significant. The changes of phase angle have a close relationship with the load frequency. The resistance to permanent deformation of asphalt mixture can be greatly enhanced by adding fiber. The effect of cement instead of mineral powder on the viscoelastic property of asphalt mixture is relatively small, while the resistance to high-temperature deformation of asphalt mixture can be improved to some extent.

Highlights

Asphalt mixture is a multiphase composite material consisting of mineral aggregate and asphalt, the mortar consist of mineral powder, fiber, cement, lime and other filler largely affect the visco-elastic properties of asphalt mixture
By asphalt mixture performance test (AMPT), adding different proportions of fiber, cement and filler to asphalt (F/A), test study have been done on mechanical properties of the asphalt mixture, and analyzed the influence of fibers, cement content and flour glue than to asphalt mixture on visco-elastic parameters,such as dynamic modulus, phase angle, frequency and flow time flow
Basalt was chosen to be the aggregate, the relative density of the aggregate are shown in Table 2 and 3, the mineral powder of limestone was used as a filler. three kinds of combinations ways, mineral powder, mineral powder + fiber and mineral powder +cement, were used to prepare mortar of Asphalt . asphalt mixture of different compositions of mortar were mixed,using Grading of AC-20, wherein,F/A of the three groups were 1.583,1.454,1.345; fiber content were 0.15%, 0.3% 0.45% ; cement was used to replace a part of the mineral powder, the ratio of the mineral powder and cement was 1: 2,1: 2.5, 1: 3

Summary

Introduction

Asphalt mixture is a multiphase composite material consisting of mineral aggregate and asphalt, the mortar consist of mineral powder, fiber, cement, lime and other filler largely affect the visco-elastic properties of asphalt mixture. Hou [6] studied visco-elastic properties of asphalt mastic by static creep experiment. The impact of composition and characteristics of mortar to visco-elastic response of asphalt mixture is not clear. By asphalt mixture performance test (AMPT) , adding different proportions of fiber, cement and F/A , test study have been done on mechanical properties of the asphalt mixture, and analyzed the influence of fibers, cement content and flour glue than to asphalt mixture on visco-elastic parameters ,such as dynamic modulus, phase angle, frequency and flow time flow

Experimental Materials

Test Method

Analysis and Discussion

Effect of Fiber Content in Mortar on Visco-elastic of Asphalt Mixture

Findings

Conclusions