Louisiana experience with crumb rubber-modified hot-mix asphalt pavement
Louisiana experience with crumb rubber-modified hot-mix asphalt pavement
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DOI：
10.3141/1789-01
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发表时间：
2002-01-01
期刊：
影响因子：
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通讯作者：
Abadie, C
中科院分区：
文献类型：
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作者：
Huang, BS;Mohammad, LN;Abadie, C
本文介绍了在路易斯安那州几种应用的碎橡胶改性（CRM）热混合沥青的实验室和现场性能对比研究。通过8种不同的CRM流程或应用程序构建了8个CRM沥青路面段。这8个CRM路段分别建在5个国道项目中。在每个项目中都建立了常规沥青混合料的控制路段，以与CRM沥青混合料的路面路段的性能进行比较。为了评价CRM和常规混合料的混合特性，对现场压实的Marshall试件进行了Marshall稳定性和流动、间接拉伸强度和应变以及间接拉伸弹性模量的室内试验。通过巷道岩心空腔分析、车辙深度测量、国际标准试验等方法，对路面的现场性能进行了比较。粗糙度指数，路面结构数通过Dynallect（动态挠度测定）系统测量，以及裂缝目视检查。结果表明，常规混合料比CRM混合料具有更高的实验室强度特性。经过5 ~ 7年的使用，使用CRM沥青混合料的路面区段的车辙深度、疲劳裂纹、国际粗糙度指数等综合性能指标优于相应的对照区段。
A comparative study of laboratory and field performance of several applications of crumb rubber-modified (CRM) hot-mix asphalt in Louisiana is presented. Eight CRM asphalt pavement sections were constructed by eight different CRM processes or applications. These eight CRM sections were built at five state highway projects. A control section with conventional asphalt mixture was constructed at each project to compare with the performance of pavement sections built with CRM asphalt mixtures. To evaluate the mixture characteristics of the CRM and conventional mixes, laboratory tests of Marshall stability and flow, indirect tensile strength and strain, and indirect tensile resilient modulus were conducted on field compacted Marshall specimens. Comparisons of the field performances of the pavements were achieved through roadway core air void analysis, rut-depth measurement, international. roughness index, pavement structure numbers measured through the Dynallect (dynamic deflection determination) system, and visual inspections of cracks. The results indicated that the conventional mixtures exhibited higher laboratory strength characteristics than the CRM mixtures. The pavement sections constructed with CRM asphalt mixtures showed overall better performance indices (rut depth, fatigue cracks, and international roughness index numbers) than the corresponding control sections after 5 to 7 years of traffic.