Effect of Filler Combination on the properties of Bituminous Mixes

Abstract

Fillers play an important role in the filling of voids and hence change the engineering properties of bituminous paving mixes. Conventionally cement, stone dust and lime are used as fillers. In India, concrete dust, marble dust and brick dust are considered to be cheaper and are available in large amount. In this investigation an attempt has been made to evaluate the effect of non-conventional and cheap fillers such as brick dust in bitumen paving mixes. This study deals with the combined effect of conventional and non-conventional fillers on the bituminous mixes for varying bitumen content of 4%, 5%, 6% & 6.5%. Various tests were conducted on aggregates and bitumen and the results were compared with the specifications. It has been observed that bituminous mixes with these conventional and non-conventional fillers result in satisfactory Marshall properties though requiring a same bitumen content, thus substantiating the need for its use. The study revealed that bituminous mix containing filler combination i.e (Brick dust + Hydrated lime) are suitable substitute to traditional filler and are acceptable materials for bituminous concrete of flexible pavement construction. The problem of disposal of waste materials such as marble dust, brick dust etc. is to be partly solve by this study.