LAUSR

This paper present a laboratory study on the influence of filler type on the rheological properties of mastics. Mastic is the main component that undergoes any deformations in asphalt structure. Low shear resistance can lead to susceptibility to permanent deformations. The type of filler used in mastic can highly influence its rheological properties. The main objective of the study was to evaluate different types of mineral fillers and their stiffening effect on unmodified and modified mastics in terms of permanent deformations. During this study performance of three mineral fillers, namely Jelsa granite, Portland cement and Aggersund limestone were investigated. The fillers used in this study were evaluated according to common filler characteristics, such as Rigden voids (RV), density, specific surface area, fineness modulus and others. Dynamic shear rheometer was used for testing mastics under repeated shear stress with multiple stress creep recovery test method. Mastics performance was tested under three different temperature conditions. Analysis of the results showed that limestone filler provide best stiffening effect. The main factors affecting that is its fine gradation, high percentage of RV and high specific surface value. This subsequently results in high amount of bitumen being as fixed one. Granite filler with low value of RV showed poor performance.