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Thickness Design for Cement-Treated Base Pavements

Project Details
STATE

IL

SOURCE

TRID

START DATE

07/01/21

END DATE

06/30/24

RESEARCHERS

Marshall Thompson

SPONSORS

Illinois DOT

KEYWORDS

Base course (Pavements), Cement, Compressive strength, Fatigue (Mechanics), Pavement design, Pavement performance, Thickness

LINKS

Project webpage

Product

Project description

This project developed a cement-treated base (CTB) thickness design procedure for the Illinois Department of Transportation (IDOT) based on CTB fatigue (stress ratio criterion). The researcher developed a comprehensive ILLI-PAVE database for a range of thickness design inputs (7-day compressive strength, CTB thickness, and subgrade modulus). A CTB flexural stress algorithm was derived from the comprehensive ILLI-PAVE database. Minimum CTB thicknesses for IDOT Class III and Class IV pavements were established, and the results were presented in tabular form. Falling weight deflectometer testing and project site reviews of several existing typical CTB projects indicated CTB compressive strengths are significant (average of 750 psi), and the projects are performing well. As expected, transverse shrinkage cracks have occurred in the projects.
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