Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"LTPP"”.
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Comparison of LTPP-Bind V3.1 and MEPDG for the Selection of Binder Grades
… and two pavement designs were selected using the LTPPBind V3.1 software. The recommended binders were then refined to meet realistic constraints of pavement construction in West Virginia. The performance of pavements with the selected binders, pavement structures and analysis locations was …
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Hierarchical planning and scheduling of looping a activities for robotic scouts
… the looping temporal problem with preference (LTPP), as a formalism for encoding scheduling problems that contain looping activities, and provide an algorithm to solve it. The LTPP expresses temporal and looping constraints in a compact form, while adding a preference function on the number of …
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Evaluation of the IDEAL-CT for Hveem-Designed Asphalt Mixtures in Nevada
… validate the CT Index for Nevada conditions, the LTPP SPS-10 project was used as a case study. Field core samples collected at different in-service periods within the first two years of pavement life, along with plant-produced asphalt mixtures, were tested for the CT Index. Field distress data for …
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Laboratory and Field Evaluation of Two Warm-Mix Additives in Connecticut and Validation of an Alternative Moisture Susceptibility Test
… samples from six Long-Term Pavement Performance (LTPP) test sections as well as field and laboratory compacted WMA from the Rt. 70 test sections. Wearing surface cores from the LTPP test sections were run through the MiST and water samples before and after the test were analyzed using Infrared …
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A Study of the Relationship between Borderline-dysregulated Personality and Treatment-resistant Depression in the Course of the TADS Randomised Controlled Trial
… comparing Long Term Psychodynamic Psychotherapy (LTPP) to Treatment as Usual (TAU) for 129 patients whose depression has not been successfully treated by at least two previous interventions. The author of this project took part in rating all patients with the Shedler-Westen Assessment Profile …
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Cracking and Roughness of Asphalt Pavements Constructed Using Cement-Treated Base Materials
… through the Long-Term Pavement Performance (LTPP) program to investigate the use and classification of CTB layers and evaluate the relative impact of cement content on the development of roughness and cracking in asphalt concrete (AC) pavements constructed using CTB layers. The data included …
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Model based pavement-vehicle interaction simulation for life cycle assessment of pavements
… FHWA's Long Term Pavement Performance program (LTPP), representing the U.S. roadway Network. Distributions of model parameters are determined on pavement material properties (top layer and subgrade moduli), structural properties (thickness), and loading conditions obtained from model calibration …
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Validating the empirical distress prediction models within the AASHTOWare Pavement Mechanistic-Empirical Design, using Tennessee pavement performance data from the Long Term Pavement Performance database
… data from the Long Term Pavement Performance (LTPP) database, along with previously established local and current global calibration coefficients. Findings from statistical evaluations support the need for local calibration and recalibration of the distress prediction models, in order to suit …
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Comparative analysis between MERRA and updated MEPDG climate database in the state of Tennessee
… these two climate data sources using eight LTPP sites in Tennessee was conducted. It was found that using MERRA as a climate data source for the state of Tennessee will offer better geographic coverage and therefore more precise distress predictions are expected.
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Wheel Path Wandering Based On Field Data
… used wheel path definition is derived from the LTPP distress manual with fixed width and position, in which the influence of traffic wander on wheel path was overlooked. This thesis attempts to develop a new wheel path definition based on the lateral placement investigation of heavy vehicles' …
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Sensitivity analysis and calibration of the alligator cracking model in the mechanistic-empirical pavement design guide using regional data
… the fact that there were limited sections of LTPP in every state and the model was calibrated on the average value using the national database.</p> <p>The verification of M-EPDG with level 2 and 3 inputs for the State of New Jersey did not yield satisfactory results with respect to alligator …
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Flexible Pavement Rut Depth Modeling For Different Climate Zones
… pavement rutting on granular base based on LTPP data. Flexible pavements with granular base course were considered for this study. These models lead to better understanding of rutting phenomena and the factors that may have affect in pavement rutting. In addition, these models will help …
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THERMAL FATIGUE DAMAGE OF ASPHALT PAVEMENT
… damages of 34 Long-Term Pavement Performance (LTPP) test sections. Fatigue damage predicted by the traditional AASHTOWare Pavement ME Design approach, which considers only traffic-induced fatigue damage, is compared to the fatigue damage by the developed model which considers both traffic- and …
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Soft Computing-based Life-Cycle Cost Analysis Tools for Transportation Infrastructure Management
… from the Long Term Pavement Performance (LTPP) database. By reinterpreting the model in the form of a neuro-fuzzy system, the calibration algorithm takes advantage of the learning capabilities of artificial neural networks for tuning the fuzzy membership functions and rules. The …
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Characterization of traffic load and local calibration of the MEPDG for New Mexico
… from the Long Term Pavement Performance (LTPP) database located in New Mexico are used for local calibration. The permanent deformation, alligator cracking, and longitudinal cracking models are calibrated. In calibration methodology, the target is fixed to reduce the residual sum of …
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Balanced asphalt mix design and pavement distress predictive models based on machine learning
… data acquired from laboratory records, the LTPP dataset, and the NCHRP 1-37A report, data analytics and processing methods, as well as ML models to establish pavement distress predictive models, and then developed an automated and balanced mix design procedure, further lying a foundation to …
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Machine Learning Approaches for Improving Construction Materials and Pavement Systems
… from the Long-Term Pavement Performance (LTPP) database. Not unexpectedly, the models concluded that material properties, traffic load, and climate conditions were crucial to IRI prediction. Hierarchical clustering models were constructed to group the data into four clusters, where each …
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Assessing the Mechanical Response of Pavements During and After Flooding
<p>Flooding is recognized as a catastrophic event and a threat to the load carrying capacity of pavements around the world. In the aftermath of flooding, the pavement structure could be inundated and fully saturated. The significant increase of water within pavement layers may cause weakness and …