An Experimental Investigation on the Effect of Mixing Procedures on Polypropylene Modified Bituminous Mix
Gandu Srikanth1, Arpita Saha2, Rajiv Kumar3
1Gandu Srikanth, M. Tech Student, Transportation Engineering, Lovely Professional University.
2Dr Arpita Saha, Assistant Professor, School of Civil Engineering, Lovely Professional University, Punjab.
3Dr Rajiv Kumar, Assistant Professor, School of Civil Engineering, Dr. B.R. Ambedkar National Institute of Technology Jalandhar, Punjab.

Manuscript received on 08 April 2019 | Revised Manuscript received on 16 May 2019 | Manuscript published on 30 May 2019 | PP: 1204-1210 | Volume-8 Issue-1, May 2019 | Retrieval Number: A3536058119/19©BEIESP
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Abstract: The study investigated the marshall properties of the polypropylene modified bituminous mixes by different mixing methods. Three sets of marshal samples were prepared by means of the wet, dry and control process with VG-30 grade of the binder, well-graded aggregates for bituminous concrete layer (>13.5mm). Polypropylene a class V or thermo plastic plastomer type was used for modification. During the wet process, three modified bitumen samples were prepared with 1,3 and 5 % PP by the weight of the binder. Basic binder tests were conducted, and results compared with Polymer modified bitumen code values then modified binder was used for the preparation of Marshall sample to find marshal properties of polymer modified mix (wet process). On the other hand, polypropylene was added to mix (aggregates) by 1,3 and 5% by the weight of aggregates. Here polymer was added with aggregates while preparation of marshal mix (dry process). In wet process the visco-elastic and thermodynamic properties of binder get change while the addition of polymer and changes take place in maltenes content of binder then results in hardening of the binder. In the dry process, the polymer sticks to aggregates and help to improvise coating ability during mixing and voids ratio of the specimen. So, in both the processes the marshal properties get varies due to visco-elastic and thermodynamic properties, coating, and void ratio. By comparing the results of the modified binder with neat bitumen and control marshall test results with dry and wet mix marshall test results it was concluded that dry process gives better results than wet process. In this paper investigation of the mixing process with merits and demerits, importance of polymer modification, mechanism involves in both physical and chemical changes, advantages, and disadvantages are discussed.
Keywords: Polymer Modified Bitumen, Visco-Elastic Properties, Marshal Properties, Maltenes.

Scope of the Article: Properties and Mechanics of Concrete