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211 blends fall between the typical ranges of 0.15 to 0.35 specified for sand and gravel (Das 2008). 212 Results of Table 3 also show that increasing the plastic content results in decrease in the ν 213 values. Poisson’s ratio is obtained from data corresponding to the elastic zone of stress-strain 214 curves of the blends (Figure 3). This zone for all blends of this research fell between stress 215 levels of approximately 50 kPa to 100 kPa. Low E values for blends with high plastic content 216 results in greater axial strain under the same stress as blends with low plastic content. Low ν 217 values in blends with low plastic content shows that the lateral strains do not correspondingly 218 increase. This can be attributed to low structure integrity of these blends due to high content of 219 particles with smooth surfaces (plastic particles). 220 Figures 4 and 5 show the resilient modulus versus maximum axial stress graphs for 221 RCA/HDPE and RCA/LDPE blends, respectively. As illustrated in the graphs, a high confining 222 pressure results in a high resilient modulus. This can be explained by the fact that the high 223 confinement increases the aggregate interlocking, which results in low strains and accordingly 224 low Mr values. Thach Nguyen and Mohajerani (2016) explained the effect of confining 225 pressure through predictive resilient modulus models. Figures 4 and 5 also indicate that under 226 the same confining pressure, increases in deviator (axial) stress which result in higher Mr 227 values. This can be attributed to greater stress hardening under greater deviatoric stresses 228 (Puppala et al. 2011). However, high deviatoric stress can also result in low Mr values (Thach 229 Nguyen and Mohajerani 2016) which is not the case in this research. 230 Aside from the effects of testing conditions (deviator and confining pressures), the RLT results 231 showed that in both RCA/HDPE and RCA/LDPE blends, the Mr values decreased by increasing 232 the plastic content. This, together with UCS values, is further illustrated in Figure 6. Values of 233 Mr presented in Figure 6 (b) are the average of resilient moduli obtained from 15 sequences 234 of the RLT test. Figure 6 also compares the RCA/plastic results with typical UCS values 235 reported previously for RCA (Arulrajah et al. 2014) and recommended ranges of Mr values for 9PDF Image | Stiffness Properties of Recycled Concrete Aggregate with Polyethylene Plastic Granules
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