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Showing 1 to 20 of 39 for “"pavement structure"”.
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Assessing the Mechanical Response of Pavements During and After Flooding
… and a threat to the load carrying capacity of pavements around the world. In the aftermath of flooding, the pavement structure could be inundated and fully saturated. The significant increase of water within pavement layers may cause weakness and induce damage with traffic loading, subsequently …
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Three-dimensional finite element modeling as a tool for flexible pavement design and analysis
… for analyzing the performance of flexible pavement. The study is deemed necessary because of the complexity of the landing gears and heavy loads imposed by heavier and bigger aircraft, like the Boeing 747-400, Airbus A380 and Boeing 777.</p> <p>The development of the finite element model …
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Projeto de reforço de pavimentos rodoviários e aeroportuários pelo método da resiliência: uma nova versão do programa TECNAPAV
… design procedure for flexible and semi-rigid pavements is presented. It is based on models developed from the Theory of Elasticity, either existing solutions for linear elasticity or from non-linear elasticity. The computer program TECNAPAV used for pavement management system was extended in …
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Analysis of tire-pavement interaction and pavement responses using a decoupled modeling approach
The proper understanding of tire-pavement interaction is important for the accurate analysis of load-induced stresses and strains in the pavement structure. This dissertation focuses on the analysis of the mechanism of tire-pavement interaction and the effect of tire-pavement interaction on …
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Effects of basecourse saturation on flexible pavement performance.
… to the premature failure of flexible asphalt pavements. Basecourse saturation results in increased flexural strains in the asphaltic layer and increased rutting leading to cracking of the surface layer. To obtain a physical and quantitative understanding of the deformation characteristics of …
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Uncertainty quantification for pavement life-cycle stages
… rolling resistance (RR), a major component of pavement LCA use stage, has significant impact on transportation-related energy consumption. Pavement related RR mainly includes pavement structure, surface roughness (or smoothness) and texture. This research aims at addressing current challenges …
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Super Heavy Load Pavement Analysis PaCKage (SuperPACK): Verification and Modification
Super Heavy Load Pavement Analysis PaCKage (SuperPACK(TM)) is an analysis tool that has been under development by the Pavement Engineering and Science (PES) Program. This analysis tool is intended to be the culmination of the Federal Highway Administration (FHWA) study, Analysis Procedures for …
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Mechanistic characterization of thin asphalt overlays for pavement preservation
… a preservation treatment for rigid and flexible pavements to improve ride quality, extend service life, and reduce noise levels on pavements. However, compared to the conventional methods of mechanistic analysis, analyzing thin AC overlay is complicated as these layers are directly exposed to …
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Impact of structure, material properties, temperature curling, and trafficking on load transfer efficiency
This study examines the impact of structure, material properties, temperature gradient and trafficking on load transfer efficiency of rigid airfield pavements. The current FAA mechanistic design procedure for rigid pavements assumes constant stress-based load transfer efficiency (LTE (S)) of 25% at …
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Ensaios triaxiais dinâmicos de solos argilosos
… layers. The soil samples were taken from pavements at federal highways BR-040/RJ, BR-116/ MG, and BR-277/PR. Testing aimed at two objectives: to study the effect of applied stresses and compaction conditions on the resilient modulus, and to verify the effects of stress magnitude, …
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Assessment of Improvement in Unpaved Roadway Performance Using 3D Geogrids Under Cyclic Loading
… during the following 0.8 seconds. A flexible pavement structure typically consists of an asphalt layer overlying a base course layer placed on top of the natural subgrade. The samples used in the testing program consisted of a lower layer of bentonite clay and sand mix, representing the …
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The Behavior of Pore Water Pressure in Cohesive Subgrade Soils
… 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 for saturated and unsaturated …
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Balanced asphalt mix design and pavement distress predictive models based on machine learning
… the ability of asphalt mixture to resist pavement distress, such as rutting, cracking, IRI (international roughness index), etc., is still the trend of future asphalt mix design. The service life of asphalt pavement mainly depends on the properties of the asphalt mixture. Whether asphalt …
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Use of wicking geotextile to dehydrate road embankments
“Excess water within a pavement structure is the major cause of pavement deteriorations. A roadway is often constructed with soils compacted at the optimum water contents to achieve the best performance. After construction, the soil water content variation is controlled by the ambient environment. …
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Assessment of Fracture Resistance of Asphalt Overlays through Heavy Vehicle Simulator and Laboratory Testing: Synthetic Fiber and Rubber Modified SMA Mixes
… existing jointed Portland Cement Concrete (PCC) pavements in the road network. Since these pavements are in general expensive to rehabilitate, agencies often opt for overlaying the deteriorated PCC pavement with Hot Mix Asphalt (HMA), resulting in a composite pavement. Unfortunately, the tensile …
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Development of Pavement Performance Evaluation Subroutines for 3D-Move Analysis Software
Predicting the pavement performance of existing and new asphalt concrete (AC) pavements is an important and significant task of pavement engineers. It is important to quantifying the factors (material properties, environmental factors and traffic loading) that lead to the pavement deterioration. …
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Evaluation of asphalt stabilized layer equivalency factors for use in airfield flexible pavement design
… method has been used for Air Force airfield pavement design since the late 1920s. The procedures, calculations, and related nomographs have been updated to reflect developments in the pavement design, pavement analysis, and unique landing gear configurations and load levels introduced by new …
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Adjustment factors for MEPDG pavement responses considering three- dimensional analysis and wide-base tire
The Mechanistic-Empirical Pavement Design Guide (MEPDG) provides a superior methodology as compared to its predecessor in the design and analysis of pavement structures. The mechanistic (MEDPG analysis) calculates critical pavement responses due to pavement-tire interactions. On the other hand, the …
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Instrumented Response and Multilayer Modeling of Cold-Central Plant Recycled Pavement Section
… recycled techniques in the Transportation Infrastructure Industry for rehabilitating and constructing pavements in the United States. Besides that, pavement roads are public goods that bring economic and social benefits to all countries. Therefore, assessing the pavement structural condition is …
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Development of a pavement life cycle assessment tool for airfield rehabilitation strategies
… to provide more sustainable facilities and infrastructure has increased over the past ten years. The ability to measure and quantify the environmental impacts of infrastructure projects like life cycle costs is in higher demand. Life cycle assessment (LCA) studies/tools are developed for highway …
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