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162 Resilient modulus (Mr) is an important parameter required for structural design of pavement 163 layers. Hence, investigation of the changes in resilient behavior of the blends by adding 164 particles of HDPE and LDPE was also evaluated. Resilient characteristics of the specimens 165 were determined using Repeated Load Triaxial (RLT) tests. RLT test is meant to simulate the 166 pavement layer’s condition under repeated traffic loads (AASHTO-T307-99 2007). Resilient 167 modulus (Mr) is the ratio of a repeated axial stress to the recoverable axial strain caused by the 168 repeated load. In RLT testing procedure, a haversine-shaped loading pulse with 0.1 s loading 169 period and 0.9 s resting period was applied (AASHTO-T307-99 2007). A triaxial cell was used 170 with the universal testing machine to carry out the RLT tests. A split compaction mold with a 171 diameter of 100 mm and height of 202 mm was used to prepare RLT specimens. Specimens 172 prepared with impact method were compacted in 8 layers, following the procedure described 173 in ASTM-D1557 (2012). A collar was used to ensure the aggregates remain inside the mold 174 while compacting the top layers. Materials were placed inside the mold carefully to avoid 175 segregation. During the tests, specimens were protected from moisture change by using a latex 176 membrane. A total of 60 data sets for Mr values was obtained from a range of repeated vertical 177 stress and static confinements in 15 sequences of RLT testing procedure. Two popular three- 178 parameter resilient modulus prediction models were selected to evaluate the data obtained from 179 laboratory tests. The two models used were Puppala et al. (1997) and AASHTO (2002). Though 180 there are many other methods available, these were selected since their input data was available 181 and these were suitable for granular material applications. 182 Unconfined Compressive Strength (UCS) test was carried out to determine stiffness 183 characteristics of the compacted specimens. UCS test is a popular testing procedure for 184 evaluation of pavement material. Since RLT testing is a nondestructive procedure, the same 185 specimens after completion of RLT testing were used for the UCS tests. In addition to 186 measuring UCS values, Young’s modulus (E) and secant modulus (E50) were determined from 7PDF Image | Stiffness Properties of Recycled Concrete Aggregate with Polyethylene Plastic Granules
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