| Author | Nutthapon Supawiwat |
| Call Number | AIT Thesis no. GE-01-14 |
| Subject(s) | Tires--Simulation methods
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| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-01-14 |
| Abstract | Scrap tires are undesired urban waste and are increasing at alarming rates every year. This situation has produced an acute need for finding new and beneficial ways to recycle and reuse large volumes of scrap tires. One of the possible practical applications consists of using shredded tires alone or mixed with soil as lightweight backfill materials. In this study, various tests including index tests, compression tests and large direct shear tests have been performed to investigate the engineering properties of the shredded rubber tire with and without sand mixture. In addition, the interaction with the hexagonal wire reinforcement was observed by the in-soil pullout tests. The tested materials were Ayutthaya sand, shredded rubber tires and the mixtures between both materials at various mixing ratios. The unit weight of shredded rubber tire with sand mixtures is most significantly controlled by the percentage of sand in the mixture, while moisture content is found to be insignificant. The unit weight increases with increasing sand content in the mixtures. Furthermore, shredded rubber tire with sand mixtures exhibit a significant initial plastic compression under load. Up to more than 40% of the initial thickness of pure shredded rubber tire under stress of 500 kPa. However, there is a significant rebound upon unloading. With increasing sand content in the mixtures, the compressibility decreased. Beyond sand content of 50% by weight of the mixture, the compression significantly decreased to less than 20%. Shredded rubber tire with sand mixtures showed lower shear strengths than those of pure sand and do not exhibit peak shear strength. The shear strength also increased with increasing sand content in the mixture, while the displacement required for fully mobilizing the shear strength of shredded rubber tire and sand mixtures decreased. Compared with the tests in sand, the in-soil pullout resistances of PVC-coated hexagonal wire mesh reinforcement in the shredded rubber tire with sand mixtures are smaller while the displacements required for fully mobilizing the pullout resistances are greater. The pullout resistances increased with increasing sand content. Therefore, it should be noted that the method of adding sand into shredded rubber tires not only improved the deformation characteristic but also increased the strength and the pullout resistance. However, the unit weight of the mixture should be considered because increasing the portion of sand will increase the unit weight of the rubber-sand material. The constitutive model proposed by Li and Dafalias (2000) is successfully implemented into FLAC finite difference program to simulate the strength and deformation characteristics of the shredded rubber tire with sand mixtures. Consequently, the predicted pullout resistance results from numerical simulation reasonably agreed with those measured from laboratory tests. |
| Year | 2002 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-01-14 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Bergado, D. T.; |
| Examination Committee(s) | Noppadol Phien-wej;Park, Kyung-Ho; |
| Scholarship Donor(s) | Asian Institute of Technology (Partial Scholarship); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2002 |