Influence of filler types and their quantities on bitumen-aggregate adhesion

Abstract

The loss of adhesion in bituminous mixes negatively influences their durability. This mechanism was explored through analyzing active and passive adhesions between the aggregates and the bitumen that constitute bituminous mix. As part of the analysis, the measurement of mixing times and boiling water tests were conducted. Four types of fillers (natural dolomite stone dust, glass powder from glass industry, bauxite residue from aluminum industry and limestone dust from dimension stone industry) were added at variable compositions (4, 5.5 and 7%) in mixes to generalize the conclusions. The statistical analysis of results confirmed that type of filler and their quantity in bituminous mixes, significantly affect both active and passive adhesion. The results also indicated that use of calcium-based fillers (natural stone dust and waste limestone dust) showed significant improvement in both adhesions. Whereas, use of silica-based glass powder filler resulted in the worst active and passive adhesions. © 2019 Taylor & Francis Group, London.