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306 307 308 309 310 3- 311 312 313 314 4- 315 316 317 318 difference in roughness of HDPE and LDPE particle surfaces, this could be attributed to lower sphericity of LDPE particle compared with cylindrical shape of HDPE particles. Generally, a greater plastic content results in lower stiffness parameters of specimens, including E, E50 and ν values. RCA/HDPE specimens presented higher resilient modulus, due to higher E values and also, its cylindrical shape of HDPE particles. Similar to stiffness parameters, Mr values of the specimens decreased by increasing the plastic content, due to further replacement of rough-surfaced materials (RCA) with smooth-surfaced particles (HDPE/LDPE). RLT test results showed that Mr values of all the 4 types of specimen fall within the range of typical quarry materials. Moreover, the evaluation of the results using the resilient modulus models showed that this percentage of plastic particles did not affect the geotechnical nature of RCA. As a result, RCA/HDPE and RCA/LDPE blends can be used in pavement bases/subbases. 319 Acknowledgements 320 The authors wish to thank Alex Fraser Group (Victoria, Australia) for providing the recycled 321 concrete aggregates and Olympic Polymers Pty Ltd (Victoria, Australia) for providing the 322 polyethylene plastic granules for this research project. The last author is grateful to the 323 Suranaree University of Technology, the Office of Higher Education Commission under NRU 324 project of Thailand and the Thailand Research Fund under the TRF Senior Research Scholar 325 program Grant No. RTA5680002. 326 327 328 13PDF Image | Stiffness Properties of Recycled Concrete Aggregate with Polyethylene Plastic Granules
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