Clayey soils that occur in many countries, including Jordan, are considered poor materials for engineering construction because of their unfavorable geotechnical properties. Previous studies have shown that engineering performance of such soils can be improved by using different additives. This study was designed to evaluate geotechnical properties and durability characteristics of the Jordanian clayey soil after mixing it with cement kiln dust (CKD). The investigation involved testing 105 CKD-amended clayey soil samples to determine the optimum CKD-to-soil ratio for improving its geotechnical properties. Using ASTM standards, one set of soil samples was prepared for mineralogical and geotechnical characterization before and after mixing with 5, 10, 15, and 20% CKD by weight. A second set of samples was prepared and tested under 5, 11, 15, and 20 freeze-thaw (F-T) cycles. Results demonstrated that addition of 20% CKD improved geotechnical properties of the clayey soil including its F-T durability. F-T cycling was found to lower the unconfined compressive strength of the unstabilized soil by 88% while it was only 21% for the CKD-stabilized soil. Overall, CKD stabilization led to a 12-fold increase in unconfined compressive strength besides marked improvements in soil plasticity and workability. Results obtained from this investigation encourage endorsement and use of CKD as an excellent stabilizer to enhance engineering performance of clayey soils. In addition, utilizing an industrial waste for beneficial purposes contributes to the national waste minimization goal by recycling the hazardous CKD waste material, leading to significant economic, environmental, and sustainability benefits for infrastructure construction.

出现在包括约旦在内的许多国家的粘土因其不利的岩土特性而被认为是工程建设的不良材料。先前的研究表明，可以通过使用不同的添加剂来改善此类土壤的工程性能。本研究旨在评估约旦粘土与水泥窑粉尘 (CKD) 混合后的岩土特性和耐久性特征。调查涉及测试 105 个 CKD 修正的粘土样品，以确定最佳的 CKD 与土壤比例，以改善其岩土特性。使用 ASTM 标准，在与 5%、10%、15% 和 20% 的 CKD 混合之前和之后制备一组土壤样品，用于矿物学和岩土工程表征。在 5、11、15、和 20 次冻融 (FT) 循环。结果表明，添加 20% CKD 改善了粘土的岩土特性，包括其 FT 耐久性。发现 FT 循环将不稳定土壤的无侧限抗压强度降低了 88%，而 CKD 稳定土壤的无侧限抗压强度仅为 21%。总体而言，除了显着改善土壤可塑性和可加工性之外，CKD 稳定还使无侧限抗压强度增加了 12 倍。从这项调查中获得的结果鼓励认可和使用 CKD 作为一种出色的稳定剂，以提高粘土的工程性能。此外，将工业废物用于有益目的有助于通过回收危险的 CKD 废物材料来实现国家废物最小化目标，从而带来显着的经济、环境、