Evaluation of Alabama Limestone Sources for Use as Pavement Aggregate Base
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Evaluation of Alabama Limestone Sources for Use as Pavement Aggregate Base

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  • Creators:
  • Corporate Creators:
    Auburn University. Highway Research Center
  • Corporate Contributors:
    Alabama. Department of Transportation. Bureau of Research and Development
  • Subject/TRT Terms:
  • Publication/ Report Number:
    931-052
  • Resource Type:
    Research Paper
  • Geographical Coverage:
  • Corporate Publisher:
    Auburn University. Highway Research Center
  • Abstract:
    In recent years, the number of requests for approval of locally mined lime rock in Alabama has increased due to potential economic benefits associated with its use. However, the potential moisture sensitivity of lime rock is a concern that has not been fully addressed as it can impact the long-term performance of pavements. The objective of this study was to evaluate the effect of moisture, over a broad spectrum ranging from a very dry state to complete saturation, on the mechanical behavior of crushed limestone and lime rock. The second objective is to develop and identify a rapid test method for quality assurance. The resilient modulus of three limestone aggregates and four lime rock aggregates were determined at four different moisture contents including 100% saturation. The properties of the base aggregates were also obtained. The results demonstrated that the resilient modulus of limestone and lime rock increased significantly with decreasing moisture content when drying from the optimum moisture content. When saturated, limestone and lime rock aggregates mostly experienced a reduction in their resilient modulus. A series of statistical and sensitivity analyses of the laboratory test results demonstrated that the fine aggregate content, fines content, fine aggregate angularity, and plastic fines content contribute most to the moisture susceptibility of base aggregates when moisture content exceeds the optimum moisture content. A set of tests was recommended to rapidly obtain these influencing properties, and a threshold chart was developed to assess the moisture susceptibility of unbound base materials. A case study confirmed the validity and reliability of the threshold chart, which can be used during material selection and quality assurance testing in the field or laboratory. This proposed method can help ensure that the unbound base materials selected for construction can retain their stiffness or recover from the effects of climatic events in a timely and efficient manner. These findings are also valuable for pavement design and construction material selection to achieve more sustainable and climate-resilient pavements.
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