Browsing by Author "Hoegh, Kyle"
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Item All Mira Data collected on the ORNL Large Specimen(2015-09-14) Hoegh, Kyle; hoeg0021@umn.edu; Hoegh, KyleThis data was collected following a 4 in. by 4 in. grid testing on the ORNL Large Specimen at various testing settings.Item Concrete Strength Required to Open to Traffic(Center for Transportation Studies, University of Minnesota, 2016-01) Freeseman, Katelyn; Hoegh, Kyle; Khazanovich, LevThe current empirical methods for determining traffic-opening criteria can be overly conservative causing unnecessary construction delays and user costs. The research described here recommends innovative mechanistic based procedures for monitoring concrete early age development and evaluating the effect of early traffic opening on long-term damage accumulation. The procedure utilizes recent developments in nondestructive testing to optimize traffic opening timing without jeopardizing pavement longevity. These tasks were achieved via extensive field and laboratory experiments allowing for the analysis of variables such as curing condition and loading type with respect to the effect of early loading of concrete. The results of these efforts culminated in the development of a program that analyzes the effect of design and opening time decisions on pavement damage. The deliverable can be utilized by transportation agencies to make more informed decisions.Item Evaluation, Development, and Implementation of 3D GPR for Assessment of Minnesota Infrastructure(Center for Transportation Studies, University of Minnesota, 2016-12) Hoegh, Kyle; Thompkins, Derek; Khazanovich, LevThis research project evaluated the 3D Radar ground penetrating radar (3D GPR) equipment to determine applications and develop software for immediate use. A major focus was the use of 3D GPR to determine asphalt compaction uniformity. Other pavement assessment applications were explored. The research resulted in the development of new software that provides on-site mapping shortly after the last roller pass is completed on new construction. This provides the potential to select validation locations and give feedback to the contractor detailing the as-constructed performance during the paving process. The outputs of the software were also designed to allow for comparison with other technology and as-constructed information. (A user’s guide for the software is included in the project final report.) Overall, the use of 3D GPR with the developed software, combined with as-constructed data such as Intelligent Compaction pass counts, vibration amplitude, and other measures, can lead to better asphalt compaction and longer lasting roads.Item Implementation of the MEPDG for New and Rehabilitated Pavement Structures for Design of Concrete and Asphalt Pavements in Minnesota(Minnesota Department of Transportation, 2009-01) Velasquez, Raul; Hoegh, Kyle; Yut, Iliya; Funk, Nova; Cochran, George; Marasteanu, Mihai; Khazanovich, LevThe recently introduced Mechanistic-Empirical Pavement Design Guide (MEPDG) and related software provide capabilities for the analysis and performance prediction of different types of flexible and rigid pavements. An important aspect of this process is the evaluation of the performance prediction models and sensitivity of the predicted distresses to various input parameters for local conditions and, if necessary, re-calibration of the performance prediction models. To achieve these objectives, the Minnesota Department of Transportation (MnDOT) and the Local Road Research Board (LRRB) initiated a study “Implementation of the MEPDG for New and Rehabilitated Pavement Structures for Design of Concrete and Asphalt Pavements in Minnesota.” This report presents the results of the evaluation of default inputs, identification of deficiencies in the software, sensitivity analysis, and comparison of results to the expected limits for typical Minnesota site conditions, a wide range of pavement design features (e.g. layer thickness, material properties, etc), and the effects of different parameters on predicted pavement distresses. Since the sensitivity analysis was conducted over a span of several years and the MEPDG software underwent significant modifications, especially for flexible pavements, various versions of the MEPDG software were run. Performance prediction models of the latest version of the MEPDG 1.003 were evaluated and modified or recalibrated to reduce bias and error in performance prediction for Minnesota conditions.Item Portland Cement Concrete Pavement Thickness Variation Versus Observed Pavement Distress(Minnesota Department of Transportation, 2016-09) Khazanovich, Lev; Hoegh, Kyle; Barnes, Randal; Conway, Ryan; Salles, LucioBenefits from a potential significant correlation between distresses and slab thickness can be broadly applied in all stages of highway development from design and construction to maintenance decisions. In order to comprehensive explore this possibility, thickness data and existing distresses were related for three highway projects in Minnesota. Thickness was obtained through non-destructive ultrasonic testing, while distresses were recorded for the same location with a distress image software. Significant thickness variation was observed in both longitudinal and transverse directions. The combined results of thickness, shear wave velocity and distresses analysis revealed that an increase in shear wave velocity was coincident with a less damaged pavement area within a section. An in-depth statistical analysis confirmed this observation showing that shear surface velocity variation was better correlated with overall pavement performance than thickness variation. Differences in cracking behavior within a section were traced back to changes in construction and design practices, showing the potential of using shear velocity analysis for pavement maintenance. A survey and analysis procedure for shear wave velocity testing of concrete pavements is proposed.