Comparative study on The Behavior of Bituminous Concrete Mix and Warm Mix Asphalt Prepared Using Lime and Zycotherm as Additive

Abstract

The Warm Mix Asphalts (WMA) is customized bituminous mix which can be developed, laid and compact at lower temperature than conventional bituminous mix. The WMA is generally prepared by adding chemical additives to the conventional mix to get better the pavement performance. This study mainly emphasizes to compare the behavior of bituminous concrete mix and Warm Mix Asphalt (WMA). Bituminous concrete mix and WMA is prepared using lime (1% & 2%) as filler material. Zycotherm (0.1% by weight of binder) is adopted as chemical additive for the preparation of WMA. Optimum bitumen content (OBC) is determined by adopting Marshall method of bituminous mix design. Marshall Properties, Indirect tensile strength (ITS), Tensile strength ratio (TSR) of Bituminous concrete mix and WMA are determined and analyzed at OBC. The test results are satisfying the minimum requirements as defined by MoRT&H specifications. Based on the limited laboratory study carried out, it can be conclude that bituminous concrete mix is a better mix type then the WMA in terms of Marshall Properties, Indirect tensile strength and Tensile strength ratio. Since the WMA is also satisfying the minimum requirements, Therefore can also be accept as an alternative bituminous mix type as and when required.