• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>American Journal of Traffic and Transportation Engineering >Resilient Behavior of Modified Asphalt Concrete Mixture
【24h】

Resilient Behavior of Modified Asphalt Concrete Mixture

机译：改性沥青混凝土混合料的回弹性能

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Asphalt concrete pavement is designed to exhibit elastic behavior under loading at cold weather condition and a combination of elastic, plastic and viscous behavior at hot weather condition. Distress of the pavement usually starts with initiation of micro cracking due to load repetition, while such cracks can heal by themselves in slow process under repeated loading, external or internal heating, and provision of rest period at ambient temperature. The aim of this work was to assess the resilient behavior of modified asphalt concrete using three types of polymer additives such as starien- butadien- stairen (SBS), low density poluetheline (LDPE), and scrap tire rubber. Beam specimens of 381.0 mm length, 76.2 mm width, and 76.2mm thickness have been prepared with optimum asphalt content requirement and with extra 0.5% asphalt above and below the optimum. Beam specimens were tested under repeated flexure stress. The applied stress level was 138 kPa at 25℃. The loading cycle consist of 0.1 second loading application followed by 0.9 seconds of rest period. The test was conducted for 660 load repetitions using the Pneumatic repeated load system (RPLS) to allow for the initiation of micro cracks. After the specified loading cycles, the test was stopped and the Specimens have been withdrawn from the testing chamber of PRLS and stored in the oven for two hours at 60℃ environment to allow for possible micro crack healing. The specimens were then subjected to another loading cycle. Permanent, total and resilient deformations were captured through LVDT. The resilient modulus was calculated and compared among various conditions. Test results showed that the implemented polymer additives and the process of micro crack healing have positive influence on resilient modulus and deformation variables of asphalt concrete.
机译：沥青混凝土路面被设计为在寒冷天气条件下表现出在荷载作用下的弹性性能，并在炎热天气条件下表现出弹性，塑性和粘性行为的组合。人行道的窘迫通常始于由于重复载荷而引起的微裂纹，而在反复加载，外部或内部加热以及在环境温度下提供休息时间的情况下，此类裂纹可以在缓慢的过程中自行修复。这项工作的目的是评估使用三种聚合物添加剂的改性沥青混凝土的回弹性能，例如三丁烯丁二烯（SBS），低密度聚乙烯（LDPE）和废旧轮胎橡胶。制备了381.0毫米长，76.2毫米宽和76.2毫米厚的梁试样，其最佳沥青含量要求以及在最佳之上和之下的额外0.5％沥青。在反复弯曲应力下对梁样品进行了测试。在25℃下施加的应力水平为138kPa。加载周期包括0.1秒的加载时间，然后是0.9秒的休息时间。使用气动重复加载系统（RPLS）对660次重复加载进行了测试，以允许产生微裂纹。在指定的加载周期后，停止测试，并从PRLS的测试室中取出样品，并在60℃的环境下在烤箱中存放2个小时，以实现可能的微裂纹愈合。然后使样品经受另一个加载循环。永久变形，整体变形和弹性变形通过LVDT捕获。计算弹性模量并在各种条件下进行比较。试验结果表明，所添加的聚合物添加剂和微裂纹修复过程对沥青混凝土的弹性模量和变形变量具有积极的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号