| dc.description.abstract | The sources of rubber granules used in rubber sand mixture (RSM) are various, including discarded automobile tires. According to the data from the Ministry of Environment in Taiwan, there were about 150,000 tons of discarded automobile tires in 2022. However, RSM technology can effectively reuse waste tires while mitigating and reducing damage to buildings caused by earthquakes, thereby achieving sustainable development. Therefore, this study uses quartz fine sand and rubber particles of D50=0.55 mm and D50=3.00 mm as test materials, with different rubber content and particle sizes as variables to explore the mechanical properties of the rubber sand mixtures by conducting the consolidated undrained triaxial tests. On the other hand, the Cyclic triaxial tests are conducted to explore the liquefaction resistance of rubber sand mixtures.
The test results show that the main influencing factors of the shear strength of the rubber sand mixture are the effective confining pressure, the rubber content and the average particle size of the rubber particles. Under the same rubber content, the rubber sand mixture with 3.00 mm average particle size of the rubber particles has higher shear strength. The unit weight and optimal water content decrease as the rubber particle ratio increases. The rubber sand mixture with D50=3.00 mm has a higher unit weight and optimal moisture content; the apparent cohesion appears in the form of rising first and then falling, and the friction angle decreases as the rubber content increases. On the aspect of elastic modulus, E0, E50 and E100 indicate the rubber sand mixtures with D50=0.55 mm rubber granules have lower elastic modulus. Moreover, the E50 of the mixture with D50=0.55 mm tends to be stable in a lower rubber content. The rubber sand mixture with a higher average particle size of rubber particles has a higher apparent cohesion and friction angle. On the other hand, a rubber sand mixture with 40 % rubber content can effectively reduce the risk of liquefaction caused by the cyclic loading with CSR=0.1, 0.2 and 0.3, but its liquefaction resistance against cyclic loading with CSR=0.4 is weak. On the aspect of elastic modulus, the test condition with CSR=0.1, the decline in elastic modulus is the slowest in this test, and additionally, the tendency of the elastic modulus with test condition CSR=0.2, 0.3 and 0.4 respectively is close to one another. | en_US |