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

J. Geotech. Geoenviron. Eng.

Thielmann

et al. 2017

Self Cite

Tire-Derived Aggregate (TDA) has been used widely in civil engineering applications such as highway embankments, light rail foundations, landslide repairs, and retaining walls as both a recycled material and a lightweight fill. Although the shearing properties of certain types of TDA have been studied, there is still a need for representative and reliable properties of TDA with large particles, such as Type B TDA with particle sizes ranging from 150 to 300 mm. Direct shear tests were performed on Type B TDA using a new large-scale shearing device to measure properties governing internal shear strength as well as interface shear strength against concrete. The internal failure envelope is nonlinear, with a secant friction angle decreasing from 39.6 to 30.2° as the normal stress increased from 19.5 to 76.7 kPa. Negligible shearing rate effects were observed for the internal shear strength of this material. The TDA-concrete interface failure envelope is linear with a friction angle of 22.6°. The dilation angle decreased with increasing normal stress for the TDA internal shear tests, whereas only contraction was observed for the TDA-concrete interface shear tests. Displacements at failure for the TDA internal shear tests ranged from 333 to 439 mm, and were 2 to 3 times larger than those for the TDA-concrete interface shear tests.

Section: Introductionmentioning

confidence: 99%

Shearing Behavior of Tire-Derived Aggregate with Large Particle Size. I: Internal and Concrete Interface Direct Shear

Ghaaowd

J. Geotech. Geoenviron. Eng.

Thielmann

et al. 2017

Self Cite

“…An increase in volumetric contraction is observed with increasing normal stress, although the volumetric strains are not as significant as those observed in the direct shear tests on TDA reported by Ghaoowd et al (2017). In the direct shear tests reported by Ghaaowd et al (2017), the TDA was observed to initially contract to a volumetric strain of up to 303 0.8% at a horizontal displacement, after which dilation was observed. A dilation angle of 1.2 to 304 3.7° was observed for the TDA.…”

Section: Pullout Tests On Gga 275mentioning

confidence: 93%

“…The low unit weight, high thermal insulation capacity, and high permeability of TDA are distinctive properties that provide several advantages for using TDA in civil engineering applications (Humphrey 2005(Humphrey , 2008. Further, Ghaaowd et al (2017) and McCartney et al (2017) found that TDA has similar shear strength properties to granular soils and also has high damping ratio. TDA has been used widely in different civil engineering applications including subgrade replacement and backfills for embankments, retaining walls and trenches (Ahmed and Lovell 1993;Bosscher et al 1993;Bosscher et al 1997;Tweedie et al 1998;Yoon et al 2006;Humphrey 2008;Geisler et al 1989;Lee et al 1999;Tandon et al 2009;Meles et al 2013;Ahn and Cheng 2014;CalRecycle 2015;Mahgoub and El Naggar 2019).…”

Section: Introductionmentioning

confidence: 97%

“…In addition to uniaxial and biaxial geogrids having very different tensile strengths, the pullout response of different types of geogrids (uniaxial, biaxial) having different aperture sizes in TDA is not well understood. This device was built upon the direct shear/simple shear device developed by Fox et al (2018) andused by Ghaaowd et al (2017) to study the internal and interface shear strength of Type B TDA and by McCartney et al (2017) to study the cyclic shearing properties of Type B TDA.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pullout of geogrids from tire-derived aggregate having large particle size

Ghaaowd

Geosynthetics International

2020

“…Scrap rubber tires also have unique engineering properties in addition to their low thermal conductivity, including their light-weight, high frictional resistance and high damping (Zornberg et al 2004;Ghaaowd et al 2017;McCartney et al 2017;Noorzad and Raveshi 2017). Scrap rubber tires have been widely used as a replacement aggregate in many geotechnical applications, such as retaining walls, pavements, and embankments (Humphrey and Eaton 1995;Bosscher et al 1997;Youwai and Bergado 2003).…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Sand–Tire Shred Mixtures

Xiao

Nan

J. Geotech. Geoenviron. Eng.

2019

Self Cite

Sand-tire shred mixtures are useful as thermal backfills due to their lower unit weight and thermal conductivity than those of most soils. In this study, a series of thermal conductivity tests on sand-tire shred mixtures and pure sand were performed to investigate the effects of volumetric mixing ratio and tire shred particle size. A volumetric mixing ratio of 40% was found to yield the greatest decrease in thermal conductivity from that of pure sand, with a maximum percent difference of 72%. Using tire shreds with larger relative size ratio was found to result in higher thermal conductivity, and the maximum variation in the thermal conductivity percent difference with the relative size ratio can reach about 20% at a volumetric mixing ratio of 40%. An empirical model proposed to predict of the thermal conductivity of quartz sand-tire shred mixtures could capture trends in the experimental data.