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282 confining stress, bulk stress, deviator stress and octahedral shear stress is increased by adding 283 plastic particles. 284 Three statistical measurements were used in order to evaluate the goodness of fit of test data in 285 the models. These include: standard accuracy (Se/Sy), coefficient of determination (R2), and 286 Root Mean Square Deviation (RMSD). In these measures, Se is standard error of estimate and 287 Sy is the standard deviation (Azam et al. 2013; Witczak et al. 2002). For evaluation of accuracy 288 of fit, Witczak et al. (2002) criterion was used. In this criterion, Se/Sy ≤ 0.35 and R2 ≥ 90 289 represent “Excellent”, 0.36≤ Se/Sy ≤ 0.55 and 0.70 ≤ R2≤ 0.89 represent “Good”, 0.56≤ Se/Sy ≤ 290 0.75 and 0.40≤ R2 ≤ 0.69 represent “Fair”, and 0.76≤ Se/Sy ≤ 0.90 and 0.20 ≤ R2≤ 0.39 represent 291 “Poor” fit. Statistical measurements calculated and presented in Figure 9 show that test data 292 show an “Excellent” fit for both of these models. This means that resilient behavior of these 293 blends can be evaluated or predicted through these established models, in spite of existence of 294 plastic granules in them. 295 Conclusions 296 In this research, two types of recycled waste materials, being RCA and with polyethylene 297 plastic blends (HDPE and LDPE) were evaluated for their stiffness and resilient characteristics. 298 Since the polyethylene plastics in this research were used in form of granules instead of 299 reinforcing fibers, slight degradation of RCA properties was observed. The following results 300 are obtained from the outcomes of this research: 301 1- 302 303 304 2- 305 Samples prepared by adding 3% and 5% LDPE or HDPE indicated CBR values comparable to that of typical quarry materials, and these blends could be used in base/subbase layers. Blends of RCA/HDPE showed a higher CBR values. Specimens containing HDPE particles showed greater UCS values and higher Young’s modulus compared with LDPE blends. SEM images showed there was no significant 12PDF Image | Stiffness Properties of Recycled Concrete Aggregate with Polyethylene Plastic Granules
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