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The Mechanistic-Empirical Pavement Design Guide (MEPDG) Version 1.1 model was used to analyze the performance of three typical concrete pavement designs in Florida to evaluate their suitability for use as long-life concrete pavements and the effects of various design parameters on their performance. Concrete slab thickness, concrete flexural strength, and the aggregate used in the concrete were found to be the three most significant factors affecting the predicted performance of the pavement evaluated. The type of base material and the stiffness of the base material appear to have no significant effect on the predicted performance. The Long-Term Pavement Performance (LTTP) database was used to evaluate the effects of various factors on the performance of Jointed Plain Concrete Pavements (JPCP). Critical stress analysis was also performed on the selected LTPP JPCP selections to determine the maximum stress in the concrete slab under a critical load and temperature condition.
A research study was conducted to develop long-life concrete pavement designs with expected service life of over 50 years suitable for use in Florida. Two typical concrete pavement designs used in Florida were evaluated using the MEPDG program to see if they could be used for long-life concrete pavements in Florida. The MEPDG program used was calibrated for the Florida conditions. It was found that these two designs could be used as long-life pavements if the slab thickness was adequate and the concrete properties were right - low elastic modulus, low coefficient of thermal expansion and adequate flexural strength. The concrete with the right properties could be produced if it was made with the right aggregate. Among the three aggregates considered, Brooksville limestone was found to produce the best concrete for this application. DRIP 2.0 software was used to evaluate the drainage conditions for the two pavement designs, which were designated as Type I and Type II designs in this study. The effects of pavement cross slope, number of lanes, base permeability, infiltration rate and effective porosity were studied. Drainage analyses showed that increasing the slope and permeability of the designs would allow the drainage system to work better, as well as, reduce the time-to-drain required. The required combinations of these parameters for satisfactory drainage performance were determined.
With maintenance costs accounting for a large proportion of road budgets, this report assesses the economic and technical feasibility of innovative wearing courses for long life road pavements. While having higher initial costs, such wearing courses ...
In Phase I, the research team contacted each of 16 participating states to gather information about concrete and concrete material tests. A preliminary suite of tests to ensure long-term pavement performance was developed. The tests were selected to provide useful and easy-to-interpret results that can be performed reasonably and routinely in terms of time, expertise, training, and cost. The tests examine concrete pavement properties in five focal areas critical to the long life and durability of concrete pavements: (1) workability, (2) strength development, (3) air system, (4) permeability, and (5) shrinkage. The tests were relevant at three stages in the concrete paving process: mix design, preconstruction verification, and construction quality control. In Phase II, the research team conducted field testing in each participating state to evaluate the preliminary suite of tests and demonstrate the testing technologies and procedures using local materials.
The state of the art of Portland cement concrete pavement evaluation is reviewed with emphasis on the methods applicable to the urban freeway environment. Methods are recommended for texture evaluation, void detection and condition surveys. Data analysis methods useful for the development of pavement performance models are presented. The overall framework for life cycle cost (LCC) analysis is described with recommendations for the development of a LCC method for the Arizona Department of Transportation.
The primary objective of this study was to develop, implement, and evaluate a Level 1 performance-related specification (PRS) for the construction of a jointed plain concrete pavement in the State of Florida. The study included an evaluation of the construction quality levels achieved on recent Florida JPCP projects and the formulation of a Level 1 PRS using the results of the quality evaluation and defined FDOT pavement practices as a basis. The Level 1 PRS defined the sampling and testing requirements for three acceptance quality characteristics (AQCs): thickness, strength, and smoothness. The corresponding performance-based pay factor curves were developed for each AQC. The Level 1 PRS was included as an overriding special provision in the July 2001 letting of the paving project SR 9A (I-295 Leg) in southeast Jacksonville, Florida. Construction of the PRS project took place in 2004–05. Three lanes and tied shoulders were placed in both directions. AQC measurements obtained from the project were used to compute PRS pay factors and establish pay adjustments for the contractor. The higher-than-target (i.e., higher-than-design) quality levels achieved by the contractor resulted in significant pay increases for the contractor under the PRS. Feedback from FDOT and the contractor indicated that this first PRS implementation in Florida was successful, particularly with respect to the layouts of lots and sublots and quality achieved. Several suggestions were received to improve and streamline the PRS process.
Manual of integrated material and construction practices for concrete pavements.