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首页> 外文期刊>Romanian Journal of Transport Infrastructure >Performance-Based Asphalt Mix and Pavement Design
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Performance-Based Asphalt Mix and Pavement Design

机译：基于性能的沥青混合料和路面设计

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Prediction and optimization of in-service performance of road pavements during their live time is one of the main objectives of pavement research these days. For flexible pavements the key performance characteristics are fatigue and low-temperature, as well as permanent deformation behavior at elevated temperatures. The problem facing pavement designers is the need to fully characterize the complex thermo-rheological properties of hot mix asphalt (HMA) over a wide temperature range on the one hand, while on the other also providing a realistic simulation of the traffic- and climate-induced stresses to which pavements are exposed over their design lives of 20 to 30 years. Where heavily trafficked roads are concerned, there is therefore an urgent need for more comprehensive test methods combined with better numerical forecast procedures to improve the economics and extend the service lives of flexible pavements under repair and maintenance programs. This papers therefore focus on performance-based test methods on the basis of existing European standards that address effective mechanical characteristics of bituminous materials and which may be introduced into national requirements within the framework of European HMA specifications. These test methods comprise low temperature tests, i.e. the tensile stress restrained specimen test or the uniaxial tensile strength test, stiffness and fatigue tests, i.e. the four point bending beam test or the uniaxial tension compression test, as well as methods to determine permanent deformation behavior by means of dynamic triaxial tests. These tests are used for the performance-based mix design and subsequently implemented in numerical pavement models for a reliable prediction of in-service performance, which, in combination with performance-based tests, enables a simulation of load-induced stresses and mechanogenic effects on the road structure and thus improved forecasts of the in-service performance of flexible pavements over their entire service lives.
机译：预测和优化道路路面在使用期间的使用性能是当今路面研究的主要目标之一。对于柔性路面，关键的性能特征是疲劳和低温以及在高温下的永久变形行为。路面设计人员面临的问题是，一方面需要全面表征热拌沥青（HMA）在宽温度范围内的复杂热流变特性，另一方面还需要提供对交通和气候的真实模拟。路面在20到30年的设计寿命中承受的应力。因此，在涉及交通繁忙的道路时，迫切需要更全面的测试方法以及更好的数值预测程序，以改善经济性并延长维修和保养计划下的柔性路面的使用寿命。因此，本文将重点关注基于性能的测试方法，该方法基于解决沥青材料有效机械特性的现有欧洲标准，并且可能会在欧洲HMA规范的框架内引入国家要求。这些测试方法包括低温​​测试（即拉伸应力约束试样测试或单轴拉伸强度测试），刚度和疲劳测试（即四点弯曲梁测试或单轴拉伸压缩测试）以及确定永久变形行为的方法通过动态三轴测试。这些测试用于基于性能的混合料设计，随后在数字路面模型中实施，以可靠地预测使用中的性能，与基于性能的测试相结合，可以模拟载荷引起的应力和机械性能。道路结构，从而改善对柔性路面在整个使用寿命中的使用性能的预测。

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