Evaluation of the Effects of Filler Fineness on the Properties of an Epoxy Asphalt Mixture.

Wei Xu,Jian Zhao,Zhengxiong Chen,Feng Wang,Jintao Wei

doi:10.3390/ma14082003

Wei Xu, Jian Zhao + Show 3 more

Open Access

https://doi.org/10.3390/ma14082003

Copy DOI

Abstract

The type and fineness of a filler significantly affect the performance of an asphalt mixture. There is a lack of specific research on the effects of filler fineness and dust from aggregates on the properties of epoxy asphalt (EA) mixtures. The effects of aggregate dust and mineral powder on the properties of an EA mixture were evaluated. These filler were tested to determine their fineness, specific surface area and mineral composition. The effects of these fillers on the EA mastic sample and mixture were evaluated. The morphology of the EA mastic samples was analyzed using scanning electron microscopy (SEM). The effects of the fillers on the Marshall stability, tensile strength and fatigue performance of the EA mixture were evaluated. The dust from the aggregates exhibited an even particle size distribution, and its average particle size was approximately 20% of that of the mineral powder. The SEM microanalysis showed that the EA mastic sample containing relatively fine dust formed a tight and dense interfacial bonding structure with the aggregate. The EA mixture sample containing filler composed of dust from aggregate had a significantly higher strength and longer fatigue life than that of the EA sample containing filler composed of mineral powder.

Highlights

The aggregate fraction of the asphalt mixture that passes through the 0.075 mm sieve is derived from aggregate dust and additional fillers
This study examined the effects of fillers on the properties of an epoxy asphalt (EA) mastic and a mixture
The results demonstrated that the EA mixture sample prepared based on scheme (A) yielded the highest Marshall stability, followed by those prepared based on scheme (B) and scheme (C)

Summary

Introduction

The aggregate fraction of the asphalt mixture that passes through the 0.075 mm sieve is derived from aggregate dust and additional fillers (such as mineral powder). Conventional mineral powder is generally produced by ball milling, and the morphology and granularity of its particles are affected by the processing methods. The mass of its filler accounts for approximately. 5–10% of its total mass, whereas the surface area of its filler accounts for a principal proportion of its total surface area [1]. The dust contained in aggregates at a certain proportion will significantly affect the properties of asphalt mixtures [2,3,4]. The effects of fillers on the properties of asphalt mixtures have been relatively extensively investigated

Methods

Results

Conclusion