Ageing characteristics of some low penetration grade binders

机译：一些低渗透级粘合剂的老化特性

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In the United Kingdom, the long term performance predictions for High Modulus Bases (HMB's) containing hard low penetration grade binders have been based on the projection of the behaviour of "conventional" flexible base materials manufactured with 50 or 100 penetration grade binder. Whether failure is assumed to occur by crack initiation at the top (as more recent evidence suggests) or by fatigue crack initiation at the bottom of a bituminous pavement layer, it is of concern that HMB might be fundamentally more "brittle" than "conventional" bituminous material. This characteristic may lead to more rapid crack propagation especially at lower temperatures and after a degree of ageing. Hard grade bitumen samples from different sources were subjected to accelerated ageing procedures: the Rolling Thin Film Oven Test (RTFOT); and the High Pressure Ageing Test (HiPAT). Rheological and cohesion testing were carried out using a Dynamic Shear Rheometer and a Vialit Pendulum Cohesion tester. A cellular method was adopted for analysing the overall binder properties. The rheological and cohesive characteristics of the low penetration grade binders tested changed in a different manner and at different rates with ageing, for each different source, with the two straight-run binders tested showing the least susceptibility to ageing.

机译：在英国，对含有硬质低渗透等级粘合剂的高模量基材（HMB's）的长期性能预测是基于对使用50或100渗透等级粘合剂制造的“常规”柔性基材的行为的预测。无论是假定失效是由于沥青路面层的顶部裂纹引发（如最近的证据所表明的那样）还是由于疲劳裂纹在沥青路面层的底部引发而引起的，令人担忧的是，HMB从根本上比“常规”更“易碎”沥青材料。该特性可能导致裂纹更迅速地传播，尤其是在较低温度下以及一定程度的老化之后。对来自不同来源的硬质沥青样品进行了加速老化程序：滚动薄膜烤箱测试（RTFOT）；以及高压老化测试（HiPAT）。流变学和内聚力测试是使用动态剪切流变仪和Vialit摆式内聚力测试仪进行的。采用多孔方法来分析整体粘合剂性能。对于每种不同的来源，所测试的低渗透级粘合剂的流变和内聚特性随老化的变化方式和速率不同，对于两种不同的来源，测试的两种直馏粘合剂对老化的敏感性最低。

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《Fourth European Symposium on Performance of Bituminous and Hydraulic Materials in Pavements, Apr 11-12, 2002, Nottingham, United Kingdom》|2002年|p.13-24|共12页
会议地点 Nottingham(GB);Nottingham(GB)
作者
I. Widyatmoko; R.C. Elliott; M.W. Heslop; J.T. Williams;
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Scott Wilson Pavement Engineering Ltd., 9―10 Faraday Building, Nottingham Science and Technology Park, University Boulevard, Nottingham NG7 2QP;

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正文语种 eng
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Ageing characteristics of some low penetration grade binders

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