An experimental study on effect of mixing procedure on polypropylene modified bituminous mix

The research paper deals with the polypropylene modified bituminous obtained by different mixing methods and their Marshallproperties.Dry, Wet and control marshal samples were assembled with VG-30 grade of binder and fine graded aggregates of bituminous concrete coat (>13.5mm). Polypropylene which was used for modification is a class V or thermo plastic plastomer. Three altered bitumen samples having 1,3 and 5% PP by weight of binder were used for wet test. The binder test was conducted and results were compared with normal binder and polymer altered bitumen and finally Marshall Properties of Marshall Sample (wet process) prepared by modified binder was observed. In dry process polymer was added with aggregates, which is formed by polypropylene mixed with aggregates by1, 3 and 5% aggregates by weight. The thermodynamic and visco-elastic properties alter in wet process and the polymer added enhances the hardness of binder while the polymer alters coating ability during mixing in dry process. Thus Marshall Properties changes in both wet and dry process. The test conducted with bitumen and modified binder and control Marshall Test of dry and wet process concludes that the results of dry process are far better than wet process. This paper looks into the mixing process, their advantages and disadvantages, its importance, mechanism dealing with physical and chemical changes.