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Showing 1 to 20 of 25 for “"Falling Weight Deflectometer (FWD)"”.
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The Behavior of Pore Water Pressure in Cohesive Subgrade Soils
… water pressure in subgrade cohesive soils under Falling Weight Deflectometer (FWD) tests. The deflection of a pavement structure largely depends on the deformation of subgrade soils, which is in turn dependent upon soil stiffness. Soil stiffness can be characterized by the resilient modulus. …
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In-Situ Recycling: Applications, Guidelines, and Case Study for Local Governments
… pavement sections in Christiansburg, VA, using Falling Weight Deflectometer (FWD) and Ground Penetrating Radar (GPR). Additionally, using the FWD and GPR data, alternate recycled designs were proposed in addition to a cost comparison to a conventional design.
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Evaluation of interlayer bonding in hot mix asphalt pavements
<p>This study investigates the potential of falling weight deflectometer (FWD) data for use in quantifying the level of interlayer bonding achieved in pavements. Data was obtained and used from the Federal Aviation Administration's (FAA) National Airport Pavement Test Facility located in Atlantic …
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Laboratory and Field Evaluation of Performance-Engineered Stress Relief Courses in Nevada
… ESRC stability and resistance to cracking. The falling weight deflectometer (FWD) testing in conjunction with field core samples were used to characterize the pre-overlay in order to be used in the AASHTOWare Pavement ME Design software version 2.5.5 to predict the long term performance of the …
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Verification of the dissipated energy based fatigue model using field data
… HMA layer modulus, usually taken as 50 percent. Falling Weight Deflectometer (FWD) testing results collected from flexible pavements at the FAA's National Airport Pavement Test Facility (NAPTF) were analyzed to determine the loading pass for each section that the HMA layer modulus was reduced by …
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In-Situ Behavior of Geosynthetically Stabilized Flexible Pavement
… 9, and sections 1, 4 and 7 were controls. Six Falling weight deflectometer (FWD) tests were performed on all the nine sections over 30 months. The nine sections were subjected to at least 5 load drops with wide loading range each time. The measured deflections were analyzed using the MODULUS …
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Evaluating the Traffic Speed Deflectometer (TSD) for network-level screening of pavements in Michigan
… pavement management, the Traffic Speed Deflectometer (TSD) has emerged as an alternative non-destructive testing (NDT) technology that allows for continuous pavement data collection at traffic speed without having the need for lane closures. Its’ usage focus has been researched mostly …
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An improved backcalculation method to predict flexible pavement layers moduli and bonding condition between wearing course and base course.
… of flexible pavement properties from the Falling Weight Deflectometer (FWD) test results. The conventional backcalculation methods estimate the pavement layer moduli assuming full adhesion exists between layers in the analysis process. The method developed in this research can predict the …
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Evaluation of FWD software and deflection basin for airport pavements
Falling Weight Deflectometer (FWD) test data are processed by backcalculation software to obtain modulus of layer materials of airport pavements. Currently, several backcalculation software are available. However it is not known which software produces accurate and consistence modulus values. In …
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AI-POWERED DIGITAL TWIN MODELING USING LARGE HIGHWAY INFRASTRUCTURE DATASETS
… ground vibration response, and pavement falling weight deflectometer (FWD) response analysis. The proposed digital twins enabled the real-time monitoring and analysis of infrastructure conditions which could enhance the decision-making processes, by providing useful insights in risk …
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Asphalt Perpetual Pavement Design: Utilizing Existing Pavement Systems in Ohio
… in Ohio. Field distress surveys, coring, Falling Weight Deflectometer (FWD), Seismic Property Analyzer (SPA), and the Dynamic Cone Pentrometer (DCP) tests were performed; in addition, Indirect Tensile Strength (IDT) and Resilient Modulus (E) tests were performed in the laboratory. In 2012, …
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Rapid Condition Assessment of Bridges By Falling Weight Deflectometer
… is to investigate the feasibility of using a Falling Weight Deflectometer (FWD) as an impact source to rapidly assess the condition of an in service bridge through the evaluation of its modal properties. Tests were conducted on two bridges, a Parker Pony Truss and a modern concrete deck on …
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Laboratory characterization and field performance of hot in-place recycled mixtures
… AC overlay. Field investigation comprised of Falling Weight Deflectometer (FWD), profiling for predicting International Roughness Index (IRI) and Condition Rating Survey (CRS). FWD was conducted at every 61 m for the evaluation of pavement structural capacity of existing pavement, post-HIR and …
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Analytical solutions for temperature profile prediction in multi-layered pavement systems
… the moduli of various pavement layers, analyze Falling Weight Deflectometer (FWD) testing data, as well as assess the load transfer efficiency across joints in concrete pavements. To facilitate estimation of pavement temperature profiles, one-dimensional (1-D) analytical solutions for …
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Model based pavement-vehicle interaction simulation for life cycle assessment of pavements
… wave propagation using the complete set of Falling Weight Deflectometer (FWD) time history data from 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 …
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THERMAL FATIGUE DAMAGE OF ASPHALT PAVEMENT
… was calibrated for field conditions using the Falling Weight Deflectometer (FWD) test data. The developed model is used to evaluate fatigue damages of 34 Long-Term Pavement Performance (LTPP) test sections. Fatigue damage predicted by the traditional AASHTOWare Pavement ME Design approach, …
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Soft computing based parameter identification in pavements and geomechanical systems
… deflection basins produced by the nondestructive Falling Weight Deflectometer (FWD) test data are commonly used. The nondestructive FWD test drops weights on the pavement to simulate traffic loads and measures the created pavement deflection basins. Backcalculation of pavement geometry and layer …
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Evaluation of bonded concrete overlays on asphalt pavements
… subbase and subgrade samples from each project. FWD testing, distress surveys, IRI, and ultrasonic MIRA testing was completed at each project location. First, Falling weight deflectometer (FWD) and MIRA data was collected to determine slab thickness, effective thickness of structural sections, …
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Validation of FWD Testing Results at the Virginia Smart Road: Theoretically and by Instrument Responses
Falling weight deflectometer (FWD) is currently used by most highway agencies to determine the structural condition of the highway network. Utilizing the deflections measured by the FWD, the resilient moduli of layers in the flexible pavement is determined using backcalculation software packages. …
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Study of load transfer efficiency of airfield rigid pavement joints based on stresses and deflections
… slab deflection to loaded slab deflection. Falling weight deflectometer (FWD) generally serves the purpose of measurement of deflection-based load transfer efficiency [LTE (6)]. The true load transfer is defined by stress (or strain) ratio [LTE (S)]. The current FAA specification prescribes …
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