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260 the UCS value (in kPa) of pure RCA. These are found to be close to the lower range of the 261 relationships presented in Figure 8. 262 The 60 data sets obtained from RLT testing procedure were evaluated through two predictive 263 resilient modulus models, suggested by Puppala et al. (1997), also known as octahedral stress 264 state model, and AASHTO (2002), also known as modified universal model. These models are 265 presented in Equations 1 and 2, respectively: 266 Mr = pa[k1(σ3)k2(σd)k3] (1) pa pa 267 Mr = k1pa (σb)k2 (τoct + 1)k3 (2) pa pa 268 where σ3, σd and σb are respectively, confining, deviator and bulk stresses, pa is atmospheric 269 pressure, τoct is octahedral shear stress, and k1 to k3 are model parameters. 270 Figure 9 compares the predicted with measured resilient modulus using these predictive 271 models and also presents the model parameters obtained from regression analysis of the 60 data 272 sets undertaken in this research. Model parameters k1, k2 and k3 correspond to the Puppala et 273 al. (1997) model (Equation 1). k1 and k2 are positive since an increase in σ3 and σd results in a 274 corresponding increase in Mr, as evident in Figures 4 and 5, while k3 is positive since Mr is 275 always a positive value. k1 and k2 parameters corresponding to the modified universal model 276 (Equation 2) are also positive due to similar reasons. However, k3 is negative of which an 277 increase in octahedral shear stress results in a corresponding decrease in the Mr value. This is 278 due to the fact that an increase in shear stress softens the specimen and results in a low resilient 279 modulus. Comparison between k parameters obtained from blends with and without plastic 280 shows an increase in k2 and k3 (absolute value of k3 in AASHTO (2002) model) in both models 281 by introducing plastic particles to RCA. This indicates that sensitivity of the models to 11PDF Image | Stiffness Properties of Recycled Concrete Aggregate with Polyethylene Plastic Granules
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