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Showing 1 to 20 of 40 for “"FWD"”.
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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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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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Rapid Condition Assessment of Bridges By Falling Weight Deflectometer
… 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 rolled steel beam bridge. Two …
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Evaluation of interlayer bonding in hot mix asphalt pavements
… 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 City, New Jersey. In this …
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The Behavior of Pore Water Pressure in Cohesive Subgrade Soils
… 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. Experimental tests were performed …
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Soft computing based parameter identification in pavements and geomechanical systems
… 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 properties using FWD …
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Network Level Decision-Making Using Pavement Structural Condition Information From The Traffic Speed Deflectometer
… the structural condition obtained from the FWD that is currently used in the VDOT PMS. The effective structural number (SNeff) calculated from the TSD and FWD had similar distribution, and the calculated consistency between the TSD SNeff and FWD SNeff was higher than the consistency between …
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Asphalt Perpetual Pavement Design: Utilizing Existing Pavement Systems in Ohio
… 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, five of those sites were …
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Mechanistic-Empirical Evaluation of Mn/ROAD Mainline Flexible Pavement Sections
… of the paving materials was performed through FWD and DCP testing. The effect of granular material quality on pavement response and performance was assessed through analysis of FWD data. The ""Design Time"" concept for considering temperature effects on AC modulus fatigue calculations was …
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In-Situ Recycling: Applications, Guidelines, and Case Study for Local Governments
… 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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Use of the Traffic Speed Deflectometer for Concrete and Composite Pavement Structural Health Assessment: A Big-Data-Based Approach Towards Concrete and Composite Pavement Management and Rehabilitation
… device – the Falling Weight Deflectometer [FWD]. The research efforts have concluded that although different in nature than the FWD, the TSD does furnish valid deflection measurements, from which the pavement structural health can be assessed. Most published TSD-related literature focused on …
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Evaluating the Traffic Speed Deflectometer (TSD) for network-level screening of pavements in Michigan
… quasi-static falling weight deflectometer (FWD) load from TSD dual tires loading. Such approach of using equivalent quasi-static FWD load is consistent with the AASHTO procedures for determining the Portland cement concrete (PCC) elastic modulus and modulus of subgrade reaction (composite …
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An improved backcalculation method to predict flexible pavement layers moduli and bonding condition between wearing course and base course.
… 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 interface condition between …
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Study of load transfer efficiency of airfield rigid pavement joints based on stresses and deflections
… 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 the evaluation of LTE (S) from …
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NDT application in Transport Asset Management. QA/QC performance specifications in pavement construction and maintenance
… degli strumenti ad alte prestazioni, come FWD, LWD, GPR e ARAN, nel monitoraggio ferroviario, nella valutazione delle condizioni del ballast e l interazione traversa/ballast, e anche nel riutilizzo delle ceneri vulcaniche che dopo la stabilizzazione possono essere utilizzate in strati di …
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Mechanistic-Empirical Evaluation of the Mn/ROAD Low-Volume Road Test Sections
… test results, field distress measurements, and FWD test data were used to study the effect of granular material quality on pavement performance and deflection response. The results from the rapid shear tests and permanent deformation tests show that the rutting potential of a granular material …
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Sustainable pavement applications utilizing quarry by-products and recycled/nontraditional aggregate materials
… Mix Asphalt (HMA), Falling Weight Deflectometer (FWD) tests were conducted on all finished surfaces. Significantly low deflection values were measured for the sections with cement-stabilized QB and QB blends with recycled aggregates. APT was conducted using the Advanced Transportation Loading …
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Thermochemistry and kinetic analysis on radicals of acetaldehyde + O2, allyl radical + O2 and diethyl and chlorodiethyl sulfides
… the literature show linearity on a plot of Ea_{fwd} vs [Delta]_{rxn, fwd}, yielding a slope of (0.38 +/- 0.04) and an intercept of (10.12 +/- 0.81) kcal/mol. The use of Density Functional Theory, B3LYP/6-31g(d,p), with isodesmic working reactions for enthalpy of formation of sulfur hydrocarbons …
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Laboratory characterization and field performance of hot in-place recycled mixtures
… 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 post-overlay conditions. …
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Estudo de obtenção de número estrutural em pavimentos flexíveis
… das 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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