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139 order to examine the uniformity of the mixtures, one scoop of the blends was extracted and 140 spread on the table in a circular shape, dividing the material into 4 equal portions followed by 141 observing and comparing the quarters visually. No significant difference in the plastic content 142 of each quarter was observed. 143 Using the obtained OMC and plastic content of 5%, CBR samples were prepared in a 152.4 144 mm diameter mold in five layers each compacted under modified effort using 56 blows 145 according to ASTM-D1883 (2014). In this research, plastic contents were selected so that CBR 146 values of the blends would meet road authorities’ requirements, which specify a CBR greater 147 than 80 for subbases and greater than 100 for bases. First, blends with plastic content of 5% 148 were prepared for determination of OMC. Then using the obtained values of OMC, CBR 149 samples were prepared and compacted. Based on obtained CBR values another plastic content, 150 being 3% was proposed. 151 Results of the compaction and CBR tests on blends of 95% RCA and 5% HDPE/LDPE are 152 presented in Table 2. Obviously, blending RCA with plastic granules with a low specific 153 gravity resulted in a low MDD. CBR values corresponding to 2.54 mm penetration for both 154 blends are about 100, which is the limit for pavement base layer application. As a result, in 155 order not to reach a CBR value lower than the authorities’ requirements for applicability in 156 pavement base/subbase layers, blends of RCA with 5 and a lower plastic content, i.e., 3% were 157 selected as the following: RCA95/HDPE5, RCA5/LDPE5, RCA97/HDPE3, and 158 RCA97/LDPE3. Also, in order to investigate the result of introducing these plastic granules, 159 all tests were conducted on pure RCA as well. The lower limit of CBR for typical quarry 160 material is 80% (Arulrajah et al. 2013 b). Results of modified compaction and CBR tests on 161 the RCA97/HDPE3, and RCA97/LDPE3, as well as pure RCA are presented in Table 2. 6PDF Image | Stiffness Properties of Recycled Concrete Aggregate with Polyethylene Plastic Granules
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