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Investigation of Dolomite Aggregate Long-Term Cementation and Its Potential Advantage for Building Roads

项目名称：	Investigation of Dolomite Aggregate Long-Term Cementation and Its Potential Advantage for Building Roads
摘要：	The objective of the proposed research is to systematically study the effects of chemical, mineralogical and physical properties of dolomitic aggregate fines on the long-term performances of both unbound and chemically stabilized aggregate base/subbase materials. The scope will entail a comprehensive geological survey and review of aggregate quarry maps to characterize dolomite aggregate compositions in Illinois followed by the selection of representative source samples to be studied for mechanisms responsible for cementation and significant strength gain. Because MgO comes mostly from dolomite in Illinois quarries, percent MgO in fines could be a valuable indicator of dolomite purity. Advanced materials characterization tests to be conducted on the dolomite aggregate sources will include X-Ray diffraction (XRD), X-Ray fluorescence (XRF), scanning electron microscopy (SEM), and Raman imaging (Polavaram and Garg, 2021ab) of the fines fraction. The study scope will entail short- and long-term performance monitoring of samples tested for unconfined compressive strength, and samples tested after a conditioning period to trigger precipitation-dissolution delayed reactions (by soaking samples and exposing them to freeze-thaw cycles prior to testing). After different periods of conditioning, the characterization tests will be conducted to identify changes in the phase compositions and mineralogy that may be contributing to cementation and strength gain.
状态：	Active
资金：	447926
资助组织：	Illinois Department of Transportation
管理组织：	University of Illinois, Urbana-Champaign
主要研究人员：	Tutumluer, Erol；Garg, Nishant
开始时间：	20220701
预计完成日期：	20241231
主题领域：	Highways；Materials；Pavements