Influence of mineral filler-asphalt ratio on asphalt mixture performance

الملخص EN

Current development in the design of asphalt concrete especially in the upper layers of flexible pavements contains about acceptable proportion of mineral fillers, which contributes towards the mix cohesion, resistant to rutting and improves serviceability.

It is well recognized that mineral fillers play an important role in the properties of mastics and hot-mix asphalt (HMA) mixtures.

Better understanding of the effects of fillers on the properties of mastics and HMA mixtures is crucial to good mix design and high performance of HMA mixtures.

This paper presents a laboratory investigation into the effects of different fillers on some properties of HMA mixtures.

Three filler types, three filler contents and optimum asphalt content (± 0.3) were used to investigate the effect of filler / asphalt ratio on the characteristics of HMA mixtures.

In this study, fifteen sets of bituminous mixtures using different types and amount of mineral fillers were evaluated using the Marshall Mix design method.

These mixtures were prepared using Portland cement, hydrated lime, and limestone dust fillers with varying the content by the total mixture and their effects on Marshall Properties were assessed, the best ratio of F / A was (1.4) for all type of mineral filler.