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Analysis of Temperature Data for the National Center for Asphalt Technology Test Track

机译：国家沥青技术试验中心温度数据分析

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摘要

Several combinations of mix type, aggregate type, asphalt binder type, and layer thickness are in place at the National Center for Asphalt Technology (NCAT) test track. It was desirable to examine the effects these various combinations may have on temperatures within the pavement. The purpose of this study was to evaluate measured versus predicted temperatures, evaluate the effect of mix type on pavement temperature, and compare the effect of surface layer thickness on pavement temperatures. On the basis of temperature data from the NCAT test track, some of the general conclusions are that (a) both the Strategic Highway Research Program (SHRP) and Long-Term Pavement Performance (LTPP) temperature models slightly underpredicted high pavement temperatures at 50% reliability and slightly overpredicted temperatures at 98% reliability and (b) the low-temperature models for SHRP overpredicteded low pavement temperatures for both 50% and 98% reliability. The LTPP models were also overly conservative at 98% reliability. These results indicate that asphalt binders may not need to be as soft as specified in the Superpave~® performance grading system for low-temperature performance.
机译：美国国家沥青技术中心（NCAT）的测试轨道采用了混合类型，集料类型，沥青粘合剂类型和层厚度的几种组合。期望检查这些各种组合可能对人行道内温度产生的影响。这项研究的目的是评估实测温度与预测温度的关系，评估混合料类型对路面温度的影响，并比较表层厚度对路面温度的影响。根据来自NCAT测试轨道的温度数据，一些一般性结论是：（a）战略公路研究计划（SHRP）和长期路面性能（LTPP）温度模型都稍微低估了50％的高路面温度可靠性和98％可靠性下的温度稍微高估了；（b）SHRP的低温模型对于50％和98％的可靠性都高估了低路面温度。 LTPP模型也过于保守，可靠性高达98％。这些结果表明，沥青粘合剂可能不需要像Superpave®®高性能评分系统中规定的那样具有低温性能。

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