Evaluation of Moisture Susceptibility of Pyro-Oil Modified Bitumen by Surface Free Energy Approach Shubham D. Suryawanshi, Hemantkumar P. Hadole, and M. S. Ranadive Abstract Municipal solid waste (MSW) is one of the vital environmental problems of Indian cities. Improper management of municipal solid waste (MSW) causes hazards to inhabitants. Various studies reveal that about 90–95% of MSW is disposed of unscientifically in open dumps and landfills, creating problems to public health and the environment. The surface free energy (SFE) is the essential property of materials. SFE parameters can be used to explain moisture damage, rutting, fracture, healing, etc. problems of bituminous mixes. In this paper, a comparison of surface free energy for VG30 (viscosity grade) and pyro-oil modified bitumen (POMB) was done in terms of adhesion and cohesion. The basic test like viscosity test, flash point test, penetration test, and softening point test was done on the VG 30, POMB and combination of both materials. For this research, the sessile drop method was used to calculate the surface free energy of VG 30 and pyro-oil modified bitumen. The surface free energy is used to evaluate cohesion bond energy of the material and adhesion bond energy between two conditions. Pyrolysis is one of the latest technologies and the best option for disposal. The bio oil generated from the pyrolysis process is proposed to use as a substitute to asphalt binder. The pyrolysis is one of the promising technology for the total disposal of waste. The pyro-oil (pyrolysis of plastic) derived from the pyrolysis of municipal solid waste can be best utilized as a bitumen modifier or bitumen extender in flexible pavement. The pyro-oil obtained by pyrolysis is of high-density polyethylene (HDPE) at about 600 °C. Pyro-oil modified bitumen was prepared with 1, 3 and 5% of HDPE by total weight of bitumen and mixed with 3000 rpm at 120 min by using a homogenizer instrument. The Pyrolysis of HDPE was done at 600 °C using a pilot pyrolysis plant developed in the transportation laboratory of College of Engineering, Pune, Maharashtra. Both materials were aged by short term ageing using Rolling thin film oven (RTFO). The comparison between S. D. Suryawanshi (B ) · H. P. Hadole · M. S. Ranadive Department of Civil Engineering, College of Engineering, Pune, India e-mail: badalvjti@gmail.com H. P. Hadole e-mail: hadole50@gmail.com M. S. Ranadive e-mail: msr.civil@coep.ac.in © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021 T. G. Sitharam et al. (eds.), Ground Improvement Techniques, Lecture Notes in Civil Engineering 118, https://doi.org/10.1007/978-981-15-9988-0_33 363