Life Cycle Cost Analysis of Flexible Pavements Reinforced with Geosynthetics: A Case Study of New Construction or Repair Overlays in Thailand’s Roads

Shaik Numan Mahdi1

Thanongsak Imjai1,Email

Chirawat Wattanapanich1

Reyes Garcia2

Harsimranpreet Kaur3

Muhammad Ali Musarat4

1School of Engineering and Technology, Walailak University, Nakhon si Thammarat 80160, Thailand.
2Civil Engineering Stream, School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom.
3Department of Civil Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand. 
4Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar,Tronoh 32610, Malaysia.

Abstract

This study investigates the economic viability and cost-effectiveness of the construction or repair of flexible pavements reinforced with geosynthetics in Thailand. The analysis was conducted on the road construction project under Muang District, Uttaradit province authority in Thailand, by adopting the life cycle cost analysis (LCCA) considering the agency, user, and environmental costs for the selected road segment. The study evaluated the economic analysis of National Primary Road with and without geosynthetic materials by focusing on theoretical analysis and life cycle cost analysis considering the Thailand Highway Department costs. Two types geosynthetics were considered in this study,  Polyfelt PGM-G 100/100 Geotextile paving fabric with a unit area of 430 g/m2 and Miragrid GX100/100 geogrid made from high tenacity polyester with a unit area of 335 g/m2. The results revealed that using geosynthetics can extend the road maintenance cycle as much as the material's life, making the road maintenance cycle cost about 36.67% lower than a conventional pavement. Geosynthetic materials, particularly nonwoven geotextiles, demonstrated lower embodied carbon values (2.35 CO2e/ton)than geogrids (2.36 - 2.97 CO2e/ton). Combining Polyfelt PGM-G 100/100 geotextile with on-site pavement production resulted in lower total CO2 emissions (70,888 kg CO2 eq) than traditional flexible pavement. Hence, the utilization of geosynthetic materials can lead to more sustainable and economical approaches in road pavement construction in Southeast Asia where similar approaches can be adopted.

Life Cycle Cost Analysis of Flexible Pavements Reinforced with Geosynthetics: A Case Study of New Construction or Repair Overlays in Thailand’s Roads