Development of a Joint Faulting Model for Unbonded Concrete Overlays of Existing Concrete Pavements through a Laboratory and Numeric AnalysisSachs, Steven G. (2017) Development of a Joint Faulting Model for Unbonded Concrete Overlays of Existing Concrete Pavements through a Laboratory and Numeric Analysis. Doctoral Dissertation, University of Pittsburgh. (Unpublished) This is the latest version of this item.
AbstractAn unbonded concrete overlay of an existing concrete pavement (UBOL) is a Portland cement concrete (PCC) overlay separated from the existing concrete slab by an interlayer. The purpose of the interlayer is to reduce stress transfer between the existing concrete layer and the overlay. Interlayers commonly consist of asphalt or nonwoven geotextile fabric. A laboratory investigation is used to characterize the behavior of interlayers within UBOLs. Beam specimens are tested to evaluate four different mechanisms. Both asphalt and nonwoven geotextile fabric interlayer systems are considered. The mechanisms considered are: 1) deflection characteristics of the interlayer, 2) friction developed along the interface between the interlayer and the overlay, 3) ability of the interlayer to prevent reflective cracking, and 4) bond strength at the interfaces of the interlayer (direct tension test). Each interlayer system considered will be described in this chapter followed by the test procedures for each of the four developed tests. The results, findings, and conclusions from each of the tests in the laboratory investigation are presented. The structural model development for UBOL faulting is then discussed. This includes the choice of modeling software and convergence and validation checks. The modeling parameters to characterize the interlayer using data from the laboratory testing are also outlined. Also, the modeling parameters used for the factorial of finite element runs are outlined as well as the critical response parameters which will be used in the faulting model. Finally, the development of neural networks to predict the critical responses will be described. A developed mechanistic-empirical faulting model for UBOL is then presented. This includes the development of an improved erosion model, which is implemented into a series of equations used to predict joint faulting for UBOL. The handling of climatic factors as well as traffic will also be outlined within the calculation framework established. The calibration sections used to calibrate the faulting model will be presented followed by the results of the calibration of the model and the development of a reliability and standard deviation model. Finally, a sensitivity analysis of the model is conducted. Share
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