Impact of clay brick dust on durability parameters of bituminous concrete

Abstract

Bituminous Concrete (BC) is widely used as wearing surface in flexible pavement. BC as a construction material mainly consists of coarse and fine aggregates in defined proportions and bitumen as binding agent. After compaction, it offers smooth compacted surface for the road users. In the present study, effect of replacement of sand to brick dust on properties of Bituminous Concrete (BC) is studied in this research. Aggregates of size 20 mm, 10 mm, sand and VG-30 grade bitumen were used in this research. To check the feasibility of raw materials to be used in pavement, all physical tests on aggregates and bitumen were performed as per relevant IS codes. To design Bituminous Concrete (BC), Grading 1, proportioning of aggregates was carried out. Marshall method was used for determining of Optimum Binder Content (OBC). Average of bitumen content corresponding to maximum stability, maximum bulk density and 4 % air voids was taken as OBC of BC mix. At OBC, three durability tests were performed i. e., Marshall Quotient, Tensile Strength Ratio (TSR) test and Permeability tests were conducted for all the replacements. Based on above study, it was concluded that brick dust in the range of 5 % − 10 % can be used as partial replacement of sand in BC mixes. In the range of 5 % − 10 % replacement, durability parameters conducted in this research were within the permissible limits specified by MoRTH. On exceeding replacement more than 10 %, there was drastic change in the properties of the mix. [copyright information to be updated in production process]