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首页> 外文会议>6th International RILEM Symposium on Performance Testing and Evaluation of Bituminous Materials, (PTEBM'03) Pt.1 Apr 14-16, 2003 Zurich, Switzerland >VISCOELASTIC LINEARITY LIMITS FOR BITUMINOUS MATERIALS
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VISCOELASTIC LINEARITY LIMITS FOR BITUMINOUS MATERIALS

机译：两种材料的粘弹性线性极限

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摘要

As bituminous materials are viscoelastic in nature, their performance must be characterised using test methods and analytical techniques that account for time (or rate) of loading and temperature. In addition, it is usually advisable to confine the characterisation of a bitumen to its linear viscoelastic response (small strains) to simplify the mathematical modelling of the material, as non-linear response, particularly for viscoelastic materials, is extremely difficult to characterise in the laboratory and model in practical engineering problems. This paper describes an investigation of the linearity limits of a range of unmodified and modified bituminous binders and mixtures using a dynamic shear rheometer and a purpose-built dynamic, direct tension-compression, servo-hydraulic testing apparatus. The results show that there are strain dependent linearity criteria for both binders and asphalt mixtures at high stiffness values (low temperatures for binders and low to intermediate temperatures for mixtures) as well as a high temperature strain dependent linearity criterion for elastomeric modified binders. The linearity strain criterion for the mixtures was found to be in the order of 100 microstrain with the criterion for the binders being at least 100 times greater at just over 10,000 microstrain and the polymer network strain criterion at 1,000,000 microstrain.
机译：由于沥青材料本质上是粘弹性的，因此必须使用考虑加载时间（或速率）和温度的测试方法和分析技术来表征其性能。此外，通常建议将沥青的特性限制在其线性粘弹性响应（小应变）范围内，以简化材料的数学建模，因为非线性响应（特别是对于粘弹性材料）很难在材料中进行表征。实验室和模型中的实际工程问题。本文介绍了使用动态剪切流变仪和专用动态，直接张力压缩，伺服液压测试设备对一系列未改性和改性沥青粘合剂和混合物的线性极限进行的研究。结果表明，在高刚度值（粘结剂的低温和混合物的中低温度）下，粘结剂和沥青混合物均具有应变相关的线性准则，而弹性体改性的粘结剂则具有高温应变相关的线性准则。发现混合物的线性应变标准为100微应变的量级，其中粘合剂的标准在刚超过10,000微应变的情况下至少为100倍，而聚合物网络的应变标准为1,000,000微应变。

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