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Influence of Chemical Stabilization on the Flexural Fatigue Performance of Subgrade Soil

机译：化学稳定作用对路基土抗弯疲劳性能的影响

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The chemically-stabilized subgrade (CSS) soil layer in a pavement structure can undergo flexural fatigue as a result of a high number of loading cycles and brittleness of the stabilized soil. The type and amount of chemical stabilizing agents are generally selected based on the results of unconfined compressive strength (UCS) and/or resilient modulus (M_r) tests. The UCS and M_r tests help characterize the compressive behavior of the soil and do not specifically assess the flexural behavior of the CSS layer under cyclic loads. This study aims to evaluate the fatigue life of the CSS layer and compare it with other common indicators such as UCS and M_r. For this purpose, a series of UCS, M_r and four-point flexural fatigue (FPFF) tests were conducted on CSS soil samples. The materials tested in this study consisted of six blends of a lean clay stabilized using cement kiln dust (CKD) and hydrated lime. The CKD was mixed with the soil at 5, 10, and 15% by weight of dry soil. The hydrated lime was mixed with soil at 3, 6, and 9% by weight of dry soil. It was found that while increasing the amount of stabilizing agent resulted in higher UCS and M_r values, it had an adverse effect on the fatigue life of CSS. The specimens containing 5% CKD and 3% lime showed the highest fatigue lives compared with other mixes. It was concluded that the strain endured by the material at the peak load (strain at failure) plays an important role in the fatigue life of the CSS. CSS samples with a high strain level at failure possessed a high fatigue life while those with a lower strain at failure failed after a relatively low number of loading cycles.
机译：人行道结构中的化学稳定路基（CSS）土层会因高荷载循环次数和稳定土的脆性而遭受弯曲疲劳。通常基于无侧限抗压强度（UCS）和/或弹性模量（M_r）测试的结果选择化学稳定剂的类型和量。 UCS和M_r测试有助于表征土壤的压缩行为，而无需专门评估循环载荷下CSS层的弯曲行为。这项研究旨在评估CSS层的疲劳寿命，并将其与UCS和M_r等其他常见指标进行比较。为此，在CSS土样上进行了一系列UCS，M_r和四点弯曲疲劳（FPFF）测试。在这项研究中测试的材料包括使用水泥窑粉尘（CKD）和熟石灰稳定的六种稀粘土混合物。将CKD以5、10和15％干土壤的重量与土壤混合。将熟石灰与3、6和9％（按干土壤重量计）的土壤混合。发现增加稳定剂的量会导致较高的UCS和M_r值，但会对CSS的疲劳寿命产生不利影响。与其他混合物相比，含有5％CKD和3％石灰的试样显示出最高的疲劳寿命。结论是，材料在峰值载荷下承受的应变（破坏时的应变）在CSS的疲劳寿命中起着重要的作用。失效时应变高的CSS样品具有较高的疲劳寿命，而失效时应变较低的CSS样品在相对较少的加载循环后失效。

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