新加沥青标号对高掺量RAP再生混合料强度及疲劳性能的影响

发布时间：2018-03-18 03:34

本文选题：道路工程　切入点：沥青标号　出处：《长安大学学报(自然科学版)》2017年03期 　论文类型：期刊论文

【摘要】：为了研究新加沥青标号的性能差异对高掺量回收沥青路面材料(RAP)再生沥青混合料强度和疲劳性能的影响,制备了3种不同类型的再生沥青混合料:新集料和70#沥青制备的AC-20沥青混合料;RAP掺量为50%并添加70#沥青的AC-20再生沥青混合料;RAP掺量为50%并添加90#沥青的AC-20再生沥青混合料(简称AC-20参照组、AC-20-50%RAP-70#和AC-20-50%RAP-90#,下同),3组沥青混合料采用相同的目标级配设计和沥青含量。通过强度试验和疲劳试验分析沥青混合料的性能;采用不同温度下单轴压缩试验和劈裂试验评价沥青混合料的强度;采用控制应变的UTM四点弯曲疲劳试验研究沥青混合料的疲劳性能;同时,根据再生沥青实测针入度和软化点的变化规律,探索利用公式预测再生沥青疲劳性能的可行性。研究结果表明:掺入50%RAP能使再生沥青混合料的强度提高,沥青混合料强度随试验温度升高而降低,在试验温度范围内,3组试件强度的高低排序不随试验温度变化而改变,AC-20-50%RAP-70#再生沥青混合料强度最高;再生混合料的疲劳性能与添加新沥青的标号有关,AC-20-50%RAP-90#再生沥青混合料疲劳性能最好,而AC-20-50%RAP-70#再生沥青混合料的疲劳寿命低于新制备沥青混合料,选用合适标号的新加沥青可有效改善再生沥青混合料的疲劳性能。
[Abstract]:In order to study the effect of the performance difference of new asphalt grade on the strength and fatigue performance of recycled asphalt mixture with high content recycled asphalt pavement material, Three different types of recycled asphalt mixture were prepared: new aggregate and 70# asphalt, AC-20 asphalt mixture with a content of 50% and AC-20 recycled asphalt mixture with 70# asphalt with a content of 50% and AC-20 recycled leachate with 90# asphalt. Green mixture (abbreviated as AC-20 reference group) AC-20-50, RAP-70# and AC-20-50RP-90 #.The following three groups of asphalt mixture adopt the same objective gradation design and asphalt content. The performance of asphalt mixture is analyzed by strength test and fatigue test. The strength of asphalt mixture is evaluated by compression test and splitting test of different temperature, the fatigue performance of asphalt mixture is studied by UTM four-point bending fatigue test with controlled strain, at the same time, According to the change rule of penetration and softening point of recycled asphalt, the feasibility of predicting the fatigue performance of recycled asphalt by formula is explored. The results show that the strength of recycled asphalt mixture can be improved by adding 50 rap. The strength of asphalt mixture decreases with the increase of test temperature, and the order of strength of three groups of bituminous mixture does not change with the change of test temperature, and the strength of recycled asphalt mixture is the highest in the range of test temperature. The fatigue performance of recycled mixture is related to the grade of adding new asphalt. The fatigue performance of recycled asphalt mixture is the best, while the fatigue life of AC-20-50%RAP-70# recycled asphalt mixture is lower than that of newly prepared asphalt mixture. The fatigue performance of recycled asphalt mixture can be effectively improved by selecting new asphalt with suitable grade.
【作者单位】：长安大学公路学院;
【基金】：交通运输部建设科技项目(2013 318J08 220) 河北省交通运输厅科技计划项目(Y-201302007)
【分类号】：U414

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