[1]李明欣,王选仓.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[J].长安大学学报(自然科学版),2017,37(03):9-15.
 LI Ming-xin,WANG Xuan-cang.Influence of new added asphalt grade on strength and fatigue performance of high percentage of RAP mixtures[J].Journal of Chang’an University (Natural Science Edition),2017,37(03):9-15.
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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()
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长安大学学报(自然科学版)[ISSN:1006-6977/CN:61-1281/TN]

卷:
第37卷
期数:
2017年03期
页码:
9-15
栏目:
道路工程
出版日期:
2017-05-31

文章信息/Info

Title:
Influence of new added asphalt grade on strength and fatigue performance of high percentage of RAP mixtures
作者:
李明欣王选仓
长安大学 公路学院,陕西 西安 710064
Author(s):
LI Ming-xin WANG Xuan-cang
School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China
关键词:
道路工程沥青标号RAP强度疲劳性能
Keywords:
road engineering asphalt grade RAP strength fatigue performance
分类号:
U414.75
文献标志码:
A
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 influence of new added asphalt types’ performance difference on strength and fatigue performance of high percentage of RAP (reclaimed asphalt pavement) content recycled asphalt mixture, three different types of recycled asphalt mixtures were prepared in this study. The first mixture was AC-20 asphalt mixture made from new aggregates and 70# asphalt. The other two mixtures were AC-20 recycled asphalt mixtures with RAP content of 50% and addition of 70# and 90# asphalt, respectively (abbr. AC-20 reference group, AC-20-50%RAP-70#, AC-20-50%RAP-90#). Three mixture sets used the same target grading design and asphalt content. Performance of asphalt mixture was analyzed by strength and fatigue test. Strength of asphalt mixture was evaluated by uniaxial compression test and splitting test at different temperatures. Fatigue performance was evaluated by the UTM four-point bending fatigue test with controlled strain. Feasibility of using formula method to predict fatigue performance of recycled asphalt was also investigated based on the change of penetration and softening point of recycled asphalt. The results show that strength of recycled asphalt mixture can be improved by adding 50% RAP, and strength of asphalt mixture decreases with the increase of test temperature. Within the test temperature range, strength order of the three groups does not change with the increase of test temperature. AC-20 recycled asphalt mixture by adding 70# asphalt ranks the highest in strength. Fatigue performance of the regenerated mixture is related to the addition of the new asphalt type. AC-20 recycled mixture by adding 90# asphalt has the best fatigue performance, while fatigue life of the recycled mixture with 70# asphalt is lower than that of the reference asphalt mixture set. New asphalt with an appropriate asphalt grade can improve the fatigue performance of recycled asphalt mixture effectively.

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更新日期/Last Update: 2017-06-06