Type of Document Thesis Author Kampmann, Raphael Author's Email Address email@example.com URN etd-07212008-173629 Title Engineering Properties of Florida Concrete Mixes for Implementing the AASHTO Recommended Mechanistic-Empirical Rigid Pavement Design Guide Degree Master of Science Department Civil and Environmental Engineering, Department of Advisory Committee
Advisor Name Title Wei-Chou V. Ping Committee Chair Michelle Rambo-Roddenberry Committee Member Tarek Abichou Committee Member Keywords
- Rigid Pavement
- Pavement Performance
- Mechanistic-Empirical Pavement Design Guide
- Coefficient of Thermal Expansion
- cte Sensitivity
Date of Defense 2008-07-14 Availability unrestricted AbstractThe coefficient of thermal expansion (CTE) is a fundamental property of Portland cement concrete (PCC). The magnitude of temperature-related pavement deformations is directly proportional to the CTE during the pavement design life. Because of its critical effect on PCC performance, it is proposed to be considered for distress and smoothness prediction by the newly developed Mechanistic-Empirical Pavement Design Guide (M-E PDG).
To account for M-E PDG implementation in Florida, three typical Florida concrete mixtures were experimentally measured for compressive strength, flexural strength, splitting tensile strength, Young’s modulus, Poisson’s ratio, and CTE according to AASHTO TP-60. The test results revealed that PCC’s CTE rapidly increases within the first week but stabilizes after 28 days. However, to accurately analyze the mix designs using the new mechanistic-empirical concept considering all three hierarchy levels, nine different JPCP models were generated. Their PCC layer thicknesses were iteratively determined before the resultant pavement structures were evaluated based on the predicted distresses (faulting and cracking) and smoothness (IRI). It was found, that cracking is the most critical pavement performance criterion for Florida JPCP. Moreover, top-down fatigue damage was isolated to be the controlling failure mechanism because of insignificant faulting and minor smoothness reduction.
Based on the thickness idealized JPCP models, a CTE sensitivity matrix was developed for adequate comparison of predicted pavement performance under interchanging CTE values. Despite wide ranging properties, clear patterns were exposed and distinctive performance envelopes arose for certain criteria. It was established that the new M-E PDG, is minimally CTE sensitive to faulting, CTE sensitive to bottom-up damage (for thin PCC layers), and extremely CTE sensitive to top-down damage, cracking, and smoothness.
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