The effect of combination and addition of some mineral fillers on hot m ix asphalt performance

الملخص EN

The using of conventional hot mix asphalt causes unnecessary road maintenance.

It is necessary to use modified materials in pavement construction which could improves the performance of asphalt concrete pavement mixture.

The major objective of this research is to evaluate the effect of combination and addition of some mineral fillers on some properties of hot mix asphalt .

Hot mix asphalt specimens have been prepared with aggregate, nominal maximum size (19) mm and Al- Daurah asphalt cement (40-50).

Two types of mineral fillers has been used : Portland cement and limestone dust.

Percentage of Portland cement has been used in this work (6 %) for binder course, limestone dust has been used in dry state with the percentage (1, 2, 3) % by weight of total aggregate as part replacer of the used filler content.

Hydrated lime was used in dry state too but as locally additive with the percentage (1) % by weight of total aggregate as part replacer of the used filler content.

The performance of asphalt mixtures are evaluated using Marshall test, indirect tensile test and permeability test.

It is concluded that the combination and addition of some mineral fillers to asphalt mixtures showed ; the Marshall stability and indirect tensile strength are increased by (1.3,1.2) times respectively when compared with control mixtures .

Permeability results are decreased by (5.5) times when compared with control mixtures .

For this research the recommended filler combination with (4 % cement, 1% limestone dust and 1 % hydrated lime as an additive) is the best for hot mix asphalt performance .