Large triaxial test of shredded rubber tire with and without sand mixture and the constitutive model verification | |
| Author | Amnart Rittirong |
| Call Number | AIT Thesis no.GE-02-13 |
| Subject(s) | Tires Materials Compression testing |
| Note | A thesis submitted in partial fulfillment of the requirements ยท for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-02-13 |
| Abstract | Disposal of used rubber scrap tires has become a major environmental problem worldwide. Using shredded tires as lightweight backfill materials is one of the possibly practical applications in recycling used rubber tires. From the results of the large triaxial test, the unit weight and behavior of shredded rubber tire-sand mixtures were controlled by sand proportion. The unit weight proportionally increases with increasing sand content in the mixtures. The pure shredded rubber tires demonstrated the linear stress-strain relationship; no failure was found, while the shredded rubber tire-sand mixtures had the nonlinear stress-strain relationship. Shredded rubber tire-sand mixtures showed lower shear strengths than those of pure sand. However, sand showed dilative deformation, while the shredded rubber tires showed contractive deformation. Therefore the deformation characteristic of shredded rubber tire-sand mixtures was in between dilation and contraction. The addition of 30% sand portion yielded a significant decrease in compressibility. According to the numerical study, the constitutive model proposed by Li and Dafalias (2000) successfully simulated the strength and deformation characteristics of the shredded rubber tire with sand mixtures. For the full scale test simulation of the shredded rubber tire fill, the linear elastic model agreed with the full scale test. Increasing in the sand proportion, the lateral earth pressure coefficient was decreased. The lateral earth pressure coefficient of shredded rubber tire was significantly higher than that of sand and decreased with increasing in proportion of sand. In addition, the lateral earth pressure coefficient considerably decreased whenever the mixed material was dominated by sand. For the preliminary design guidelines, the ultimate pullout failure envelopes obtained from the previous study were empirically normalized by the nonlinear equation. The proposed nonlinear empirical equation with respect to the proportion sand agreed with the overall pullout resistance of hexagonal wire in shredded rubber tire-sand fill . Finally, the lateral earth pressure coefficient from the numerical analysis incorporated with the proposed nonlinear pullout resistance envelopes can be utilized to design the reinforced wall using shredded rubber tire sand mixtures as backfill material and hexagonal wire as reinforcement. |
| Year | 2003 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-02-13 |
| 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;Glawe, Ulrich ; |
| Scholarship Donor(s) | Japanese Government; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2003 |