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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

CSM Conversion Factors and Regression Parameters to Back Cast CSM Strength and Modulus

The AASHTOWare Pavement ME Design software requires a 28-day Modulus of Rupture (MOR) for characterizing the strength, and a 28-day elastic modulus (E) for characterizing the stiffness, of a cementitiously stabilized material (CSM) base layer. Cored field samples of CSM will be obtained as part of the data collection effort to locally calibrate the Pavement ME transfer functions. The age of these samples correspond to the period of time from initial construction to time of sampling; i.e., 10 – 20 years, not 28 days as required by Pavement ME. Further, Mississippi DOT has not evaluated the MOR for CSMs typically used in Mississippi. Since laboratory testing for CSM MOR is time consuming, level two correlation factors are required to estimate MOR from either CSM indirect tension (IDT) or unconfined compressive strength (UCS) tests. In this study MOR, IDT, UCS, and E will be evaluated for typical Mississippi blends of CSM. Conversion factors will be developed between each of the three strength characterizations and between UCS and E. Strength and modulus regression parameters will be developed to back cast strength and modulus from age of cored samples to 28 days.