Shearing Behavior of Tire-Derived Aggregate with Large Particle Size. II: Cyclic Simple Shear

John S. McCartney, Ismaail Ghaaowd, Patrick J. Fox, Michael J. Sanders, Stuart S. Thielmann, Andrew C. Sander
2017 Journal of Geotechnical and Geoenvironmental Engineering  
Although Tire-Derived Aggregate (TDA) has been used widely as lightweight fill 8 in civil engineering applications, the properties governing its response under cyclic loading are 9 not well understood. Reliable data on the evolution of shear modulus and damping ratio with 10 cyclic shear strain amplitude are needed for the prediction of the seismic response of TDA fills, 11 especially those with larger particle sizes up to 300 mm (Type B TDA). This study presents the 12 results of cyclic simple
more » ... ts of cyclic simple shear tests performed on Type B TDA using a new large-scale testing 13 device for vertical stresses ranging from 19.3 to 76.6 kPa and shear strain amplitudes ranging 14 from 0.1% to 10%. The shear modulus of Type B TDA has a maximum value of 3,355 kPa and 15 decreases with increasing shear strain amplitude, which is smaller in magnitude and similar in 16 trend to natural granular soils in this vertical stress range. Continuous volumetric contraction was 17 observed during cyclic loading for all stress levels. The damping ratio for Type B TDA showed a 18 different behavior from granular soils, with a relatively high magnitude of 20 to 25% at the 19 lowest shear strain amplitude (0.1%), followed by a decreasing/increasing trend with increasing 20 amplitude. The shear modulus was found to follow a power law relationship with vertical stress, 21 similar to granular soils, and the damping ratio was not sensitive to vertical stress level. 22 23 1 Associate Professor,
doi:10.1061/(asce)gt.1943-5606.0001781 fatcat:7qvfphz6xfaw5dq5gwchtinxym