THE EFFECT OF FILLER TYPE AND CONTENT ON ASPHALT MIXTURE PROPERTIES

Abstract

The performance of the asphalt mixture is affected by the properties and specifications of the materials that make up the mixture, like bitumen, aggregate, and the types of the filler mineral material, as it has shown in many studies. In this study, the effect of filling type on asphalt mixture properties were studied using three different types and in different proportions, where Gravel powder, Limestone powder, and Portland Cement were used and with ratios of (3.5%, 5%, 6.5%) of the total weight of aggregate with Bitumen content (3.5%, 4%, 4.5%, 5%, 5.5%). This research is dedicated to study the effect of filler type and amount on the asphalt mixture properties. The general results of the Marshall test showed an improvement in some properties of the asphalt mixture with 5% of Bitumen content, where the results showed that the use of Gravel powder improves the Stability property with an increase rate between 4% to 21% and 8% to 16% Compared to Limestone powder and Portland cement respectively. Also, the value of VMA% of gravel powder samples increased by 5% and 3% for both Limestone powder and Portland cement respectively. There is also a large convergence in the results of Retained Strength for each of Gravel powder and Portland cement, where the percentage of reached more than 98% and 97% for each of Gravel powder and Portland cement respectively