Optimising the moisture durability SATS conditioning parameters for universal asphalt mixture application
Optimising the moisture durability SATS conditioning parameters for universal asphalt mixture application
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DOI：
10.1080/10298436.2012.655740
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发表时间：
2012-08
影响因子：
3.8
通讯作者：
J. Grenfell;N. Ahmad;G. Airey;A. Collop;R. Elliott
中科院分区：
文献类型：
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作者：
J. Grenfell;N. Ahmad;G. Airey;A. Collop;R. Elliott
饱和老化抗拉刚度（SATS）程序是第一个实验室沥青混合料耐久性协议，联合收割机结合水分损害和氧化老化沥青混合料的调节之前，机械测试。然而，SATS程序的应用往往主要针对具有相对“硬”粘合剂和总体高劲度模量要求的基础材料，并且被认为对于更标准的沥青混合物可能太严格。本研究的重点是了解的SATS调节参数的变化对沥青混合料的相对水分损害评估性能的影响，特别是“软”的粘合剂，高粘合剂含量，最后，低空气空隙含量的混合物。使用四种不同的骨料类型，以及“硬”10/20 pen和“软”40/60 pen沥青，改变压力、温度和持续时间的参数，一次一个或组合，以达到测试更常用的40/60 pen材料的合适组合。发现允许SATS程序用于广泛范围的典型使用的沥青混合物的参数的最佳组合为0.5MPa压力、85°C温度和24小时持续时间。修订后的SATS耐久性调节方案仍然能够成功区分“差”的易湿骨料和“好”的材料。
The saturation ageing tensile stiffness (SATS) procedure is the first laboratory asphalt mixture durability protocol to combine moisture damage and oxidative ageing during the conditioning of asphalt mixtures prior to mechanical testing. However, the application of the SATS procedure has tended to be predominantly targeted at base materials with relatively ‘hard’ binders and overall high stiffness modulus requirements and is considered potentially too severe for more standard asphalt mixtures. This research study focused on understanding the effect of changes to the SATS conditioning parameters on the relative moisture damage assessment performance of asphalt mixtures, particularly ‘softer’ binder, high binder content and, finally, low air void content mixtures. Using four different aggregate types, together with ‘hard’ 10/20 pen and ‘softer’ 40/60 pen bitumen, the parameters of pressure, temperature and duration were altered, either one at a time or in combination, to arrive at a suitable combination for testing more commonly used 40/60 pen material. The optimum combination of parameters to allow the SATS procedure to be used for a wide range of typically used asphalt mixtures was found to be 0.5 MPa pressure, 85°C temperature and 24 h duration. The revised SATS durability conditioning protocol was still able to successfully discriminate between ‘poor’ moisture susceptible aggregate and ‘good’ material.