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首页> 外文期刊>The international journal of pavement engineering & asphalt technology >MEASURING AND EVALUATING THE CHARACTERISTICS OF ASPHALT AT LOW TEMPERATURES
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MEASURING AND EVALUATING THE CHARACTERISTICS OF ASPHALT AT LOW TEMPERATURES

机译：低温下沥青特性的测量与评估

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The European Asphalt Specification covers a wide range of test procedures to evaluate asphalt characteristics. However, tests evaluating crack resistance and the performance of asphalt at low temperature are yet to be included. The German testing procedure on the other hand, allows for the evaluation of asphalt characteristics at low temperatures. With increasing demand for such test, the German approach will be reviewed by the European counterparts for possible adoption in the European Specification upon presentation by the work committee AK 7.6.5. "Performance of Asphalt" (Head: M. Hase) of the German Road and Transportation Research Association (FGSV). As a result in summer 2008 the prEN 12697-46 could be introduced to the Europeean Committee. The following paper presents the German experiences with the testing procedure during the last twenty yearsrnThe German test system consists of Uniaxial Tension Stress Tests (UTST) and Tensile Stress Restraines Specimen Tests (TSRST) carried out at different temperatures. The UTST assesses the tensile strength, failure strain, while the Thermal Stress Restrained Specimen tests assess the failure stress, temperature and the cryogenic tensile strength versus the temperature. By combining the results of the UTST and TSRST, the tensile strenght reserve in relation to the temperature is estimated. This tensile strength reservere represents the tension from the traffic load that an asphalt layer should bear in addition to the cryogenic stresses due to temperature drops.rnThis paper describes the testing procedure and illustrates the potentials of the test system. The application of the test for the prediction of asphalt performance at low-temperature conditions is evaluated using different asphalt mixtures.
机译：欧洲沥青规范涵盖评估沥青特性的各种测试程序。然而，评估抗裂性和低温下沥青性能的测试尚未包括在内。另一方面，德国的测试程序可以评估低温下的沥青特性。随着对这种测试的需求不断增加，工作方法AK 7.6.5提出后，欧洲同行将对德国的方法进行审查，以可能在欧洲规范中采用。德国道路和运输研究协会（FGSV）的“沥青性能”（负责人：M. Hase）。结果，可以在2008年夏季将prEN 12697-46引入欧洲委员会。以下论文介绍了德国在过去20年中的测试程序经验。德国测试系统包括在不同温度下进行的单轴拉伸应力测试（UTST）和拉伸应力约束试样测试（TSRST）。 UTST评估拉伸强度，破坏应变，而热应力约束试样测试评估破坏应力，温度以及低温拉伸强度与温度的关系。通过结合UTST和TSRST的结果，可以估算出相对于温度的拉伸强度储备。该抗张强度储备表示除了由于温度下降引起的低温应力外，沥青层还应承受的交通负荷所产生的拉力。本文描述了测试程序，并说明了测试系统的潜力。使用不同的沥青混合物评估了在低温条件下预测沥青性能的测试应用。

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