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Task 5. Leah Nehl. Development of Standard Laboratory Testing Method.
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Task 5 Leah Nehl
Development of Standard Laboratory Testing Method • The objective of this task is to develop a testing procedure to address material properties needed to support practical pavement design. The focus will be on developing standard test methods to be used specifically for AASHTO related pavement designs. • The FDR process produces a layer that will be modeled as a base course within the structure of a flexible pavement. • Depending on the FDR process selected, the base course layer can be classified as one of the following types: • Unstabilized • Stabilized FDR with Portland Cement • Stabilized FDR with Fly Ash • Stabilized FDR with Asphalt Emulsion • Stabilized FDR with Asphalt Emulsion + Lime • Stabilized FDR with Foamed Asphalt + Portland Cement
Tests with unstabilized FDR will use the results of Task 4, thus will not be performed. • 5 levels of stabilizer (PC, Fly Ash, Emulsion, Emulsion + Lime, Foamed Asphalt + PC) • Lime content for Emulsion + Lime stabilizer is constant: 1.0 % • PC content for Foamed Asphalt + PC stabilizer: Optimum %
Material & Samples • Poor Dirty • Poor Clean • Good Dirty • Good Clean • All four types of material will be combined with rap. Tests will be run on samples consisting of 25, 50, and 75 percent rap.
SPT Machine • Resilient Modulus • Dynamic Modulus • E* Master Curve • Repeated Load Triaxial
Dynamic Modulus Results AASHTO’s standard test method TP 62-07 specifies that this test should be run at five different temperatures -10°C, 4°C, 21°C, 37°C, and 54°C. -10°C will be omitted from the testing procedure.
Triaxial Machine • Compressive Strength • CBR • Modulus of Rupture