Geotechnical Properties of Power plant Ash and Re-cycled Plastic Waste Modified Bitumen on Asphalt Pavement.

Felix Okonta and Langeriwa Mthombeni

Department of Civil Engineering

University of Johannesburg

South Africa, 2000

fnokonta@uj.ac.za, lmthombeni@jra.org.za

Background

The rapid increase in traffic volumes and loads has led to the deterioration of existing roads while increasing demand for the development of new roads (Landman, 2003). subsequently, construction and maintenance of roads have been faced with multiple problems including insufficient quality materials and funds (Mistry & Roy, 2016). Since disposal of Eskom ash and plastic waste is a problem in South Africa, the potential development and application of modified asphalt with Eskom ash and finely shredded recycled plastic waste present enormous sustainable environment and economic benefits (Matshitse, 2015)

Methods

The study reviewed various Asphalt performance modes to identify key failure modes and possible mitigation mechanism. The failure modes are analysed on both high and low weather conditions. The main failure modes under discussions are rutting and cracking which arises under two weather conditions hot and cold weather respectively (Zhang et al 2018). A research site ( for the development of instrumented pavement test strips ) of 3.4 m lane road of 0.5km has been identified on two strategic regions to gather data under various traffic conditions for both winter and summer.

Preliminary Results

The preliminary laboratory results Mishra(2018),Serrano-Guzman(2015) indicate between 10-15 % reduction in Bitumen quantity per ton of Asphalt which approximately equate to 8 – 12% reduction in costs. (0.625 plastic -fly ash ratio)The elastic modulus improves by 5-8% due to Fly Ash enhancing the asphalt flexibility, its temperature range and susceptibility to thermal cracking Ciar’an J.Lynn et al(2016). The plastic increases rheological properties of Asphalt. further field testing to commence

Conclusions

The study focuses on sustainable alternatives or combinations of innovative materials which are cost effective and environmentally friendly to improve the performance and durability of Asphalt materials for various application i.e. design, construct and maintenance. The instrumented pavement test strips are vital for field performance simulation and evaluation.

Key words

Fly Ash, Thermal Cracking, Rutting, Plastic Waste, Green economy.

Acknowledgements

Prof Felix Okonta for the academic mentorship, Pro Naidoo, Rami Kobela and City of Johannesburg for the opportunity and support, Mr Muziwandile Nkonyane for constant support and guidance, Mr Siyabonga Nodu for motivation ,Mr Erick Tshikhudo and Mr Puleng Mokgohloa for teamwork, Mmabatho Mothoa for encouragement and Johannesburg roads agency A/CEO Musa Mkhacane for inspiration.

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Mr. Langeriwa Foster Mthombeni