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首页> 外文会议>Airfield and Highway Pavement Specialty Conference; 20060430-0503; Atlanta,GA(US) >Comparison of Moisture Damage In Hot Mix Asphalt Using Ultrasonic Accelerated Moisture Conditioning and Tensile Strength Test Results
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Comparison of Moisture Damage In Hot Mix Asphalt Using Ultrasonic Accelerated Moisture Conditioning and Tensile Strength Test Results

机译：超声加速水分调节和抗张强度试验结果对比热拌沥青中的水分破坏

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摘要

Ultrasonic accelerated moisture conditioning (UAMC) has been demonstrated to be a quantitative analysis to evaluate the moisture sensitivity of a hot mix asphalt (HMA) mixture. Data from the UAMC test procedure was evaluated for repeatability and statistically compared to tensile strength test results after one and multiple cycles of freeze-thaw conditioning. UAMC is accomplished by containing a loose sample of HMA on a sieve in a 60°C waterbath while subjecting the sample to ultrasonic energy. As the asphalt recedes from the surface of the aggregate, small particles of the mix are released and drop through the sieve. The percent of material lost from the sample is recorded for five hours and plotted with respect to conditioning time. The slope of a linear regression function that is fit to the data represents the rate at which the small particles are released as the asphalt recedes along the surface of the aggregate. The value of the slope has been demonstrated to be a quantifiable representation of the moisture sensitivity for a HMA mixture, and the greater the value the more susceptible the mixture is to moisture damage. Seven mixes were subjected to UAMC. Replicate samples were used to define the UAMC slope of the linear regression function and evaluate the repeatability of the UAMC one-day test procedure. Repeatability was confirmed in six of the seven mixes, and the average UAMC slope for all mixes had a significant relationship to tensile strength test results after one and multiple cycles of freeze-thaw conditioning.
机译：超声波加速水分调节（UAMC）已被证明是定量分析，可评估热拌沥青（HMA）混合物的水分敏感性。评估了UAMC测试程序的数据的可重复性，并经过一轮和多轮冻融调节后，将其与拉伸强度测试结果进行统计比较。 UAMC通过在60°C水浴中的筛子上容纳HMA松散样品，同时对样品施加超声能量来完成。随着沥青从骨料表面退缩，混合物中的小颗粒被释放并通过筛子掉落。记录五个小时从样品中损失的材料的百分比，并根据调节时间作图。拟合数据的线性回归函数的斜率表示当沥青沿着集料表面退去时小颗粒释放的速率。斜率的值已被证明是HMA混合物水分敏感性的可量化表示，并且该值越大，混合物对水分的损害越敏感。将七种混合物进行UAMC。使用重复样本定义线性回归函数的UAMC斜率，并评估UAMC一日测试程序的可重复性。在七种混合物中的六种中确认了重复性，并且在经过一轮和多轮冻融调节后，所有混合物的平均UAMC斜率与抗张强度测试结果有显着关系。

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