Study on the Effect of Varying Mixing and Compaction Temperature of BC Mix using Polymer Modified Bitumen

The bituminous concrete mix design aims to govern the percentage of bitumen, filler, fine aggregates, and coarse aggregates to produce a mix which is workable, sturdy, long-lasting and economical. Bituminous ingredients are widely used for roadway construction, primarily because of their excellent binding characteristics and water proofing properties and relatively low cost. Bituminous concrete mix is strong enough to handle vehicle traffic, and is relatively easy to overhaul. Present study focuses on the design of Bituminous Concrete mix (Grade-II) prepared using Polymer modified binder [PMB-70 (SBS)]. The Marshall method of mix design was adopted to prepare mix and at optimum bitumen content, Marshall Properties and Indirect Tensile Strength (ITS) test were conducted on Bituminous Concrete Mix by varying mixing and compaction temperatures. The Indirect Tensile Strength value has been considerably increased from mixing temperature 140oC to 160oC and as further increase in mixing temperature to 170oC there is a hasty reduction. The Fatigue test result shows the maximum number of fatigue cycles and higher resilient modulus value at optimum mixing temperature 160oC and compaction temperature 140oC