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Evaluating the fatigue properties of hot mix asphalt reinforced by recycled PET fibers using 4-point bending test

机译：用四点弯曲试验评估再生PET纤维增强的热拌沥青的疲劳性能

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This research evaluates the effect of recycled polyethylene terephthalate (PET) fibers on the fatigue properties of hot asphalt mix. Based on micro-structural analysis, fiber contents were taken into account as equal to 0.0 (i.e. reference mix), 0.5, 1.0, 1.5 and 2.0% by weight of bitumen. Fibers used with two lengths of 1 and 2 cm and an average diameter of 30 gm. For comparison, crumb PET with the particle size of 0.425-1.180 mm was used at the rate of 1 and 2% by weight of bitumen. Slab-shaped specimens were compacted by laboratory roller compactor to achieve 4 0.2% air void. After that, the specimens were removed from the mold and sawed to obtain beam-shaped specimens. 4-Point bending test was performed to evaluate the fatigue response of the modified and unmodified specimens considering EN12697-24 standard. The fatigue tests were performed at 20 degrees C and initial strain levels of 300, 500 and 700 microstrain using universal testing machine (UTM-14). Based on the obtained results, the flexural stiffness of mixes containing both additives was lower than the reference mix. The reduction in the flexural stiffness continued as the fiber and crumb PET content increased. The fatigue life of fiber reinforced mixes was higher than the reference one. At initial strain of 300 microstrain, the most increase in the fatigue lives of fiber reinforced mixes containing 1 and 2 cm fibers were equal to 149 and 177% of the reference mix, respectively. Also, at 700 microstrain the fatigue lives of aforementioned mixes were 138 and 163% of the reference mix, respectively. Likewise, the most increases in the fatigue lives of modified specimens with 1 and 2% crumb PET were 148 and 163% of the reference one, respectively. Based on the obtained results and performed analyses, the optimum fiber and crumb PET contents were 1 and 2% by weight of bitumen, respectively. (C) 2017 Elsevier Ltd. All rights reserved.
机译：这项研究评估了再生的聚对苯二甲酸乙二醇酯（PET）纤维对热沥青混合料疲劳性能的影响。基于微观结构分析，将纤维含量考虑为等于0.0（即参考混合物），0.5、1.0、1.5和2.0重量％的沥青。所用纤维的长度分别为1和2 cm，平均直径为30 gm。为了比较，以0.4和1.1重量％的沥青的比例使用粒度为0.425-1.180mm的碎PET。通过实验室压路机压实板状样品，以达到4个0.2％的空气空隙。之后，将样品从模具中取出并锯开以获得梁状样品。根据EN12697-24标准，进行了4点弯曲试验，以评估改性和未改性试样的疲劳响应。使用通用测试机（UTM-14）在20摄氏度和300、500和700微应变的初始应变水平下进行疲劳测试。根据获得的结果，包含两种添加剂的混合物的弯曲刚度均低于参考混合物。随着纤维和碎屑PET含量的增加，弯曲刚度继续降低。纤维增强混合物的疲劳寿命高于参考样品。在300微应变的初始应变下，包含1和2 cm纤维的纤维增强混合物的疲劳寿命增加最多，分别等于参考混合物的149和177％。同样，在700微应变下，上述混合物的疲劳寿命分别为参考混合物的138％和163％。同样，碎屑PET为1％和2％的改性样品的疲劳寿命最大增加分别是参考样品的148％和163％。基于获得的结果和进行的分析，最佳纤维和碎屑PET含量分别为沥青的1和2重量％。 （C）2017 Elsevier Ltd.保留所有权利。

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