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Ruggedness Evaluation of the Tube Suction Test

机译：吸力测试的坚固性评估

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The tube suction test (TST) was developed for assessing the moisture/frost susceptibility of granular base materials. The susceptibility ranking is based on the mean surface dielectric value of compacted specimens after a 10-day capillary soak in the laboratory. During the process of implementing the TST statewide, Texas Department of Transportation personnel raised concerns about the reproducibility of the test procedure, leading to the ruggedness testing performed in this research. Seven factors were investigated, including air temperature, mixing and soaking water salinity, dielectric probe seating force, number of days of drying before the start of capillary soaking, aggregate fines content, water bath height, and specimen compaction energy. Sixteen specimens of each of the two aggregates, a limestone and a caliche, included in this study were treated with specific combinations of the different levels of these factors according to the Plackett-Burman experimental design. Statistical hypothesis tests performed on the data indicate that air temperature, drying time, fines content, water bath height, and compaction energy are significant for the caliche, while only air temperature is statistically significant for the limestone. Small variations in mixing and soaking water salinity and dielectric probe seating force do not apparently exert significant influence on final dielectric values in the TST. Based on the results of the research, recommendations are given for improving the interlaboratory reproducibility of the TST.
机译：开发了管吸测试（TST），用于评估颗粒状基材的水分/霜冻敏感性。敏感性等级基于在实验室中毛细管浸泡10天后的压实样品的平均表面介电值。在全州实施TST的过程中，得克萨斯州交通运输部的工作人员对测试程序的可重复性提出了担忧，从而导致了本研究中进行的坚固性测试。研究了七个因素，包括空气温度，混合和浸泡的盐度，介电探针的固定力，毛细管浸泡开始前的干燥天数，骨料细粉含量，水浴高度和样品压实能量。根据Plackett-Burman实验设计，用不同水平的这些因子的特定组合处理了本研究中包括的两种聚集体（石灰石和钙长石）的16个标本。根据数据进行的统计假设检验表明，温度，干燥时间，细粉含量，水浴高度和压实能量对钙硅石很重要，而只有空气温度对石灰石有统计学意义。混合和浸泡水盐度和介电探针的固定力的微小变化显然不会对TST中的最终介电值产生重大影响。根据研究结果，提出了改善TST实验室间可重复性的建议。

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