IMPROVEMENT OF ROAD SUBGRADE USING WASTE TYRES

Authors

  • Phuntsho Wangmo Civil Engineering and Architecture Department, College of Science and Technology, Royal University of Bhutan,
  • Deki Selen d Civil Engineering and Architecture Department, College of Science and Technology, Royal University of Bhutan,
  • Sonam Choki Civil Engineering and Architecture Department, College of Science and Technology, Royal University of Bhutan,
  • Rinzin Wangmo Civil Engineering and Architecture Department, College of Science and Technology, Royal University of Bhutan,
  • Sonam Phuntsho Civil Engineering and Architecture Department, College of Science and Technology, Royal University of Bhutan,
  • Tshering Tobgyel Civil Engineering and Architecture Department, College of Science and Technology, Royal University of Bhutan,
  • Sangay Dema Civil Engineering and Architecture Department, College of Science and Technology, Royal University of Bhutan,

Keywords:

subgrade, waste tyre crumbs, optimum moisture content, California bearing ratio, pavement

Abstract

The increasing number of waste tyres globally is imposing huge threats on the environment, deeming a necessary proper disposal. One way of disposing these waste tyres is by using it in subgrade as stabilizers. In this paper, research has been carried out on the improvement of road subgrade using waste tyres by conducting laboratory experiments to economically increase the strength of subgrade. Sieve analysis, Atterberg Limits test and free swell test were performed on the soil for classification and suitability purposes. Different percentages of waste tyre crumbs ranging from 2% - 8% were mixed with soil on which California Bearing Ratio test and Modified Proctor Tests were performed to determine the soils strength and their respective optimum moisture contents. Results revealed that inclusion of 6% waste tyres by soil weight was the optimum percentage. Design of pavement for natural and tyre-reinforced subgrade soil revealed a reduction in pavement thickness by 92 mm for tyres-reinforced subgrade. Cost analysis of pavement constructed over weak subgrade by conventional method and reinforcement with tyres showed a saving of 8.39% when tyres were used, thereby inculcating economic benefit. The use of waste tyres in sub-base layer and its environmental impacts are recommended to be explored.

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Published

2022-12-23

How to Cite

Wangmo, P., d, D. S., Choki, S., Wangmo , R., Phuntsho, S., Tobgyel, T., & Dema, S. (2022). IMPROVEMENT OF ROAD SUBGRADE USING WASTE TYRES. Zorig Melong- A Technical Journal of Science, Engineering and Technology, 5(1), 1–7. Retrieved from https://journal.cst.edu.bt/index.php/zm/article/view/30

Issue

Vol. 5 No. 1 (2020): Volume 5 Issue 1

Section

Research Article

License

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