Browsing by Subject "Rigid pavements"

Now showing 1 - 4 of 4
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    Effects of Implements of Husbandry (Farm Equipment) on Pavement Performance
    (Minnesota Department of Transportation Research Services Section, 2012-04) Lim, Jason; Azary, Andrea; Khazanovich, Lev; Wang, Shiyun; Kim, Sunghwan; Ceylan, Halil; Gopalakrishnan, Kasthurirangan
    The effects of farm equipment on the structural behavior of flexible and rigid pavements were investigated in this study. The project quantified the difference in pavement behavior caused by heavy farm equipment as compared to a typical 5-axle, 80 kip semi-truck. This research was conducted on full scale pavement test sections designed and constructed at the Minnesota Road Research facility (MnROAD). The testing was conducted in the spring and fall seasons to capture responses when the pavement is at its weakest state and when agricultural vehicles operate at a higher frequency, respectively. The flexible pavement sections were heavily instrumented with strain gauges and earth pressure cells to measure essential pavement responses under heavy agricultural vehicles, whereas the rigid pavement sections were instrumented with strain gauges and linear variable differential transducers (LVDTs). The full scale testing data collected in this study were used to validate and calibrate analytical models used to predict relative damage to pavements. The developed procedure uses various inputs (including axle weight, tire footprint, pavement structure, material characteristics, and climatic information) to determine the critical pavement responses (strains and deflections). An analysis was performed to determine the damage caused by various types of vehicles to the roadway when there is a need to move large amounts agricultural product.
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    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, Lev
    This 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.
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    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, Lucio
    Benefits 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.
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    Simplified Design Table For Minnesota Concrete Pavements
    (Minnesota Department of Transportation Research Services & Library, 2014-06) Tompkins, Derek; Khazanovich, Lev
    The project “Simplified Design Table for Minnesota Concrete Pavements” led to the creation of MnPCC-ME, a standalone 32-bit Windows executable program to replace the preexisting RigidPave. Whereas RigidPave was based upon the outdated AASHTO 1993 design procedure for rigid pavements, MnPCC-ME is based on MEPDG version 1.1, a mechanistic-empirical design procedure that accounts for the effects of traffic loading and environment. Furthermore, MnPCC-ME was localized for Minnesota pavements through: 1) the use of local climate data and weigh-in-motion traffic data; 2) the incorporation of previously conducted calibrations of the MEPDG for Minnesota pavements; and 3) the inclusion of advanced analysis features included in MnPCC-ME’s flexible design counterpart, MnPAVE. The development and source code of MnPCC-ME is detailed in this final report.