The structure of mineral fillers and their stiffening properties in filler-bitumen mastics

The subject of the study was limestone filler samples of various structures, which were obtained through planned laboratory processing. The aim of the paper was to improve knowledge on the subject of the structure of limestone fillers (grain-size distribution, specific surface area, void content, shape ‘sphericity’ and texture of grain surfaces ‘roundness’), as well as investigating the numerical quantity relationship between the structures of fillers and their stiffening properties. Analysis of the results showed considerable differences in the structure of the tested fillers regarding Rigden void (RV), specific surface area Ssp, average grain diameter \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \emptyset _{{\text{av}}} $$\end{document} and grain morphology. It also proved, for 95% confidence interval that there is a considerable influence of RV, Ssp, as well as the roundness of the grains of the fillers on their stiffening properties.