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Geomechanics and Engineering Volume 9, Number 2, August 2015, pages 219-241 DOI: http://dx.doi.org/10.12989/gae.2015.9.2.219 |
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Application of waste rubber to reduce the settlement of road embankment |
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S.N. Moghaddas Tafreshi and A.H. Norouzi
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| Abstract | ||
| In this paper, a series of repeated load tests were carried out on a 150 mm diameter plate simulative of vehicle passes, to demonstrate the benefits of soil-rubber shred mixture in decreasing the soil surface settlement of road embankment. The results show that the efficiency of rubber reinforcement is significantly a function of the rubber content, thickness of rubber-soil mixture and soil cap thickness over the mixture. Minimum surface settlement is provided by 2.5% of rubber in rubber-soil mixture, the thickness of mixture layer and soil cap of 0.5 times the loading surface diameter, giving values of 0.32-0.68 times those obtained in the unreinforced system for low and high values of amplitude of repeated load. In this installation, in contrast with unreinforced bed that shows unstable response, the rate of enhancement in settlement decreases significantly as the number of loading cycles increase and system behaves resiliently without undergoing plastic deformation. The findings encourage the use of rubber shreds obtained from non-reusable tires as a viable material in road works. | ||
| Key Words | ||
| rubber-soil mixture; soil cap layer; rubber content; settlement; repeated load; road embankment | ||
| Address | ||
| (1) S.N. Moghaddas Tafreshi: Department of Civil Engineering, K.N. Toosi University of Technology, Valiasr St., Mirdamad Cr., Tehran, Iran; (2) A.H. Norouzi: Department of Civil, Construction and Environmental Engineering, North Carolina State University, USA. | ||