• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>Materials >Aging Characteristics of Bitumen from Different Bituminous Pavement Structures in Service
【2h】

Aging Characteristics of Bitumen from Different Bituminous Pavement Structures in Service

机译：使用中不同沥青路面结构的沥青老化特性

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The aging of bitumen seriously affects the service life of bituminous pavements. At present, there are many related researches on bitumen aging, but most of them focus on aging endured in indoor surroundings and conditions. Therefore, the conclusions obtained cannot reflect the actual aging changes of bitumen in bituminous pavements in service. In order to study the comprehensive aging process and mechanism of bitumen under the influence of service, we studied bridge deck, traffic lane, and ramp with bituminous pavement structures in service. The bitumen samples obtained from the core samples in different bituminous pavement structures were characterized by gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), dynamic shear rheometer (DSR), and fluorescence microscope (FM). The aging degree of different bitumen was analyzed, and conclusions were drawn on changes to bitumen aging from different pavement structures. The results showed that the aging degree of bitumen from the upper layer was the most serious, the aging degree of bitumen at the middle layer was weaker than that of bitumen from the upper layer, and the aging degree of bitumen from the bottom layer was the weakest for the different bituminous pavement structures. The aging of bitumen mainly occurred due to oxygen absorption. After aging, viscoelastic components of bitumen changed, and bitumen became harder. The macromolecule of bitumen could be divided into small molecules, and the small molecular weight of bitumen became large. The styrene-butadiene-styrene (SBS) modifier in the modified bitumen became granular after aging, and it appeared as a single phase in bitumen. The aging changes characterized by different analytical methods showed that the aging degree of bitumen from different layers of bituminous pavement structures in service was different. Effective measures should therefore be taken in time to decrease further aging of bitumen from the upper layer of bituminous pavements due to its inevitable early aging in service.
机译：沥青的老化严重影响沥青路面的使用寿命。目前，关于沥青老化的相关研究很多，但大多集中在室内环境和条件下的老化。因此，所得出的结论不能反映使用中的沥青路面中沥青的实际老化变化。为了研究沥青在使用中的综合老化过程和机理，我们研究了在役沥青桥面，桥面，行车道和带有沥青路面结构的坡道。通过凝胶渗透色谱（GPC），傅里叶变换红外光谱（FTIR），动态剪切流变仪（DSR）和荧光显微镜（FM）对从不同沥青路面结构的核心样品中获得的沥青样品进行表征。分析了不同沥青的老化程度，得出了不同路面结构引起的沥青老化变化的结论。结果表明，上层沥青的老化程度最严重，中层沥青的老化程度弱于上层沥青的老化程度，下层沥青的老化程度最大。对于不同的沥青路面结构最弱。沥青的老化主要是由于氧气的吸收。老化后，沥青的粘弹性成分发生变化，沥青变得更硬。沥青的大分子可分为小分子，沥青的小分子量变大。老化后，改性沥青中的苯乙烯-丁二烯-苯乙烯（SBS）改性剂变成粒状，并在沥青中显示为单相。不同分析方法表征的老化变化表明，在役沥青路面结构不同层的沥青老化程度不同。因此，应及时采取有效措施，以减少沥青路面上层沥青的进一步老化，这是因为沥青不可避免地会在使用中提前老化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

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