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Showing 1 to 20 of 33 for “"falling weight deflectometer"”.
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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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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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Characterization of Emulsion Aggregate Mixtures
… DCP, and non-destructive testing using the Falling Weight Deflectometer. The study concludes that EAM's are adequately characterized as an improved granular material.
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Early Age Assessment of Cement Treated Materials
… heavy Clegg impact soil tester (CIST), portable falling-weight deflectometer (PFWD), dynamic cone penetrometer, and falling-weight deflectometer for assessing early-age strength gain of cement-stabilized materials. Experimentation was performed at four sites on a pavement reconstruction project …
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Estudo de obtenção de número estrutural em pavimentos flexíveis
… deflexões obtidos com um equipamento tipo FWD (Falling Weight Deflectometer) e, com valores das espessuras dos pavimentos fornecidas pelo DAER-RS, foram realizadas retroanálises de todas as bacias de deformação levantadas, para cada ponto dos trechos estudados. Encontrados os Módulos de …
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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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Mechanistic-Empirical Pavement Design Procedure For Geosynthetically Stabilized Flexible Pavements
… rut depth, ground penetration radar survey, and falling weight deflectometer survey. The control section (100-mm-thick base course) exhibited rutting that was more severe than the geosynthetically stabilized sections. Falling weight deflectometer back-calculation revealed consistently weaker …
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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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Evaluation of bonding between ultra-thin portland cement concrete overlays and asphalt cement concrete
… monitoring interface strains and temperatures, falling weight deflectometer deflection responses, direct shear strengths, and distresses on a 7.2 mile Iowa Department of Transportation UTW project (HR-559). Variables investigated included ACC surface preparation, PCC thickness, synthetic fiber …
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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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Characterization of Recycled Concrete for use as Pavement Base Material
… tester, a soil stiffness gauge, and a portable falling-weight deflectometer. The laboratory testing indicated that the demolition material exhibited lower strength and stiffness than the haul-back material and reduced UCS loss after freeze-thaw cycling. However, the demolition material received …
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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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