| North Texas soils exhibit low strength, resilient modulus (MR) and subgrade Modulus of reaction (k) properties, which are known to affect the long-term performance of the pavement structures built on such soils. Hence, there is a research need to explore new stabilization techniques for providing better stabilization of these soils, which provides a better foundation support for pavement structures. In the present research, Class F Fly Ash with Sulfate Resistant Cement, Sulfate Resistant Cement, Ground Granulate Blast France Slag and Lime with Fibers were investigated to understand the effectiveness of these four stabilizers in enhancing the MR and k characteristics of control soil. As a part of the research, subgrade soil from Harwood road southeast Arlington was used as a control soil. Resilient modulus based repeated load triaxial tests were conducted on both control and treated soils at various compaction moisture contents and confining pressure conditions. Measured MR results were used in AASHTO correlations to convert them to subgrade modulus reaction (k) parameters. Both MR and k results of both control and treated soils were first analyzed to assess the effects of compaction moisture content, confining pressure and effectiveness of stabilizers in enhancing the MR and k properties, and were ranked based on their effectiveness to increase MR and k values. Sulfate resistant cement provided maximum enhancements to soil properties, followed closely by fly ash and cement treatment, GGBFS treatment and lime-fibers treatment. Both MR and k properties and their impact on surface layer thickness of flexible and rigid pavements were also addressed. |
