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Geogrid Reinforced Aggregate Base Stiffness For Mechanistic Pavement Design
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Book Synopsis Geogrid Reinforced Aggregate Base Stiffness for Mechanistic Pavement Design by : John Siekmeier
Download or read book Geogrid Reinforced Aggregate Base Stiffness for Mechanistic Pavement Design written by John Siekmeier and published by . This book was released on 2016 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: The pavement design package created by Itasca extends the capabilities of PFC3D to support triaxial testing of a synthetic unsaturated aggregate base containing geogrid. The geogrid provides lateral restraint to the aggregate base as a result of interlocking and friction between the geogrid and the aggregate particles. The macroscopic system properties are affected by the microstructural system properties. Therefore, the modeled system was used to study and quantify the effect of microstructural properties on the macroscopic properties, which include the stress-strain curves produced during triaxial tests at different confinements. The microstructural properties of the aggregate base include: particle size, particle type (density, Young’s modulus, and Poisson’s ratio of each particle; and friction between particles), aggregate base moisture content (suction and gap), and initial aggregate base porosity. The microstructural properties of the geogrid include: geometry (aperture and rib dimensions), Young’s modulus, bond stiffness, and grid-grain interface behavior. The pavement design package provides a mechanistically defensible model for aggregate-geogrid interaction, which was used to improve pavement design by estimating geogrid gain factors for typical geogrid-reinforced aggregate roadways. It is anticipated that a simplified geogrid gain factor adjustment will be trialed during pavement design for projects where geogrid is being considered. As expected, this study concludes that geogrid provides benefit and that this benefit varies during the year. Therefore, it is recommended that the seasonal effects be included during implementation. This would allow the fatigue and rutting to be more accurately estimated over the expected pavement design life.
Book Synopsis Recent Developments in Pavement Design, Modeling and Performance by : Sherif El-Badawy
Download or read book Recent Developments in Pavement Design, Modeling and Performance written by Sherif El-Badawy and published by Springer. This book was released on 2018-10-30 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume includes a collection of research and practical papers from an international research and technology activities on recent developments in pavement design, modeling and performance, and effects on infrastructure, green energy, technology and integration. Sustainability is increasingly a key priority in engineering practices. With the aging transportation infrastructure and renewed emphasis on infrastructure renovation by transportation agencies, innovations are urgently needed to develop materials, designs, and practices to ensure the sustainability of transportation infrastructure. The volume is based on the best contributions to the 2nd GeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures, Egypt 2018 – The official international congress of the Soil-Structure Interaction Group in Egypt (SSIGE).
Book Synopsis Development of a Mechanistic Model for Geogrid Reinforced Flexible Pavements by : Jayhyun Kwon
Download or read book Development of a Mechanistic Model for Geogrid Reinforced Flexible Pavements written by Jayhyun Kwon and published by . This book was released on 2007 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes the development of a mechanistic response model for the analysis of geogrid base reinforced flexible pavements and to investigate the response benefit of geogrid-reinforcement. This is an axisymmetric finite element structural model that considers the nonlinear, stress dependent pavement foundation geomaterials, i.e., unbound base aggregates and fine grained subgrade soils, anisotropic behavior of the granular base materials, as well as the compaction and preloading induced residual stresses in the granular base. The mechanistic model was used to investigate geogrid reinforcement mechanisms by considering locked-in horizontal residual stresses formed around the geogrid location for a proper modeling of the stiffening effect shown by the geogrid. These residual stresses are taken as initial conditions in pavement response analysis. To validate the response model, full-scale flexible pavement test sections, geogrid reinforced and unreinforced, were constructed at the University of Illinois Advanced Transportation Research and Engineering Laboratory (ATREL). Results from full-scale tests showed reduced critical pavement responses due to the inclusion of geogrid reinforcement. Higher percent reductions in lateral deflections in the aggregate base were realized especially in the direction of traffic. The anisotropic characterization of the granular base was needed to better capture the measured responses from the full-scale test sections. Field forensic and pavement trench studies were used to further calibrate the mechanistic response model. Typical increased horizontal residual stresses at the level of approximately 41 kPa was also needed 100 mm around the geogrid to better match measured pavement responses of the reinforced sections. As a result of the calibration efforts, the predicted responses at different locations in the test sections compared in general well with the field measured responses under different load levels.
Book Synopsis Proceedings of GeoShanghai 2018 International Conference: Transportation Geotechnics and Pavement Engineering by : Xianming Shi
Download or read book Proceedings of GeoShanghai 2018 International Conference: Transportation Geotechnics and Pavement Engineering written by Xianming Shi and published by Springer. This book was released on 2018-05-03 with total page 511 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the fourth volume of the proceedings of the 4th GeoShanghai International Conference that was held on May 27 - 30, 2018. This volume, entitled “Transportation Geotechnics and Pavement Engineering”, represents the recent advances and technologies in transportation geotechnics and pavement engineering. This book covers a wide range of topics, from transportation geotechnics, to geomechanics at various length scales, to pavement materials and structures. The book offers a unique mix of numerical modeling studies, experimental studies, and case studies from industry. It may be of interest to researchers and practitioners in the fields of transportation engineering and pavement engineering. Each of the papers included in this book received at least two positive peer reviews. The editors would like to express their sincerest appreciation to all of the anonymous reviewers all over the world, for their diligent work.
Book Synopsis Evaluation of Mechanisms Governing the Stabilization of Unbound Aggregate Bases by Geogrids in Flexible Pavements by : Subramanian Sankaranarayanan
Download or read book Evaluation of Mechanisms Governing the Stabilization of Unbound Aggregate Bases by Geogrids in Flexible Pavements written by Subramanian Sankaranarayanan and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The benefits of using geosynthetics to stabilize the unbound aggregate layers in flexible pavements, in terms of improvement to pavement life or potential decrease in layer thickness, have been well documented. Early research focused on developing ratios such as the traffic benefit ratio (TBR) or the layer coefficient ratio (LCR) to quantify (empirically) the benefits of including geogrids, and for their use in the design of flexible pavements with those geogrids. However, the lack of a mechanistic understanding of geogrid-stabilization and the empirical nature of this data limited their use to the geogrids and pavement materials that were used to develop them. With the proliferation of different geogrid products and pavement materials, the scope of the early research has become limited and attempts to correlate the properties of the geogrids and pavement materials to the improvement in performance of the pavement have not been successful. This study aims to further the understanding of the mechanisms involved in geogrid-stabilization and to identify the mechanistically relevant properties that contribute to this stabilization. Accelerated pavement tests are conducted, using the model mobile load simulator (MLS11), on reduced-scale pavement test sections with and without geogrids for stabilization under controlled, laboratory conditions. The performance of the pavement sections is evaluated by monitoring the deformation of the surface, the internal particle displacements (within the base), and the dynamic increase in stress (within the pavement structure) for increasing traffic volume. The deformation of the surface is obtained by profiling the surface of the pavement at regular traffic intervals using a laser profilometer, designed and built in-house for this study. A unique cost-effective displacement measuring technique is developed and implemented to obtain the horizontal displacement data of particles in the base. The data from the dense array of the particle tracking sensors is used to generate the horizontal displacement field, horizontal normal strain field and shear transfer efficiency plots in the base. The vertical stress distribution is obtained from the earth pressure cells installed within the pavement structure that are monitored for dynamic stress responses with applied traffic. The inclusion of the stabilizing geogrid resulted in reduced rut development, reduced particle displacements within the base and a wider distribution of the applied load for similar traffic volumes in the control and stabilized sections. The improvement in pavement life due to the stabilization of the base by the geogrid is quantified as the traffic benefit ratio (TBR). The TBRs are determined for seven different geogrids from the accelerated pavement tests, and correlated with the most commonly used in-isolation properties of the geogrid (geometric and tensile properties), and interaction properties of the geogrid-base aggregate composite. The TBRs are found to be best correlated to the coefficients of soil-geosynthetic composite stiffness (K [subscript SGC]) obtained from the soil-geosynthetic interaction tests
Download or read book GMA White Paper Ii written by Ryan Berg and published by . This book was released on 2000 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geosynthetic reinforcement of the base, or subbase, course of pavement structures is addressed. The value added with reinforcement, design criteria/protocols, and practices for design and for material specifications are presented. Base, or subbase, reinforcement is defined within as the use of geosynthetic reinforcement in flexible pavements to support vehicular traffic over the life of a pavement structure. Primary base reinforcement benefits are to improve the service life and/or obtain equivalent performance with a reduced structural section. Substantial life-cycle cost savings are possible with base reinforcement. The use of geosynthetic reinforcement to aid in construction over low strength subgrades, termed subgrade restraint within, is also addressed. Geosynthetic reinforcement is used to increase the support equipment during construction of a roadway. Geogrid, geotextile, and geogrid-geotextile composite materials are addressed within.
Book Synopsis Geotechnics for Transportation Infrastructure by : Ravi Sundaram
Download or read book Geotechnics for Transportation Infrastructure written by Ravi Sundaram and published by Springer. This book was released on 2019-06-12 with total page 703 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents selected papers from the International Symposium on Geotechnics for Transportation Infrastructure (ISGTI 2018). The research papers cover geotechnical interventions for the diverse fields of policy formulation, design, implementation, operation and management of the different modes of travel, namely road, air, rail and waterways. This book will be of interest to academic and industry researchers working in transportation geotechnics, as also to practicing engineers, policy makers, and civil agencies.
Book Synopsis Advances in Pavement Design through Full-scale Accelerated Pavement Testing by : David Jones
Download or read book Advances in Pavement Design through Full-scale Accelerated Pavement Testing written by David Jones and published by CRC Press. This book was released on 2012-10-08 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pack: Book and CDInternationally, full-scale accelerated pavement testing, either on test roads or linear/circular test tracks, has proven to be a valuable tool that fills the gap between models and laboratory tests and long-term experiments on in-service pavements. Accelerated pavement testing is used to improve understanding of pavement behavior,
Book Synopsis Advances in Materials and Pavement Performance Prediction II by : K. Anupam
Download or read book Advances in Materials and Pavement Performance Prediction II written by K. Anupam and published by CRC Press. This book was released on 2020-12-08 with total page 501 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inspired from the legacy of the previous four 3DFEM conferences held in Delft and Athens as well as the successful 2018 AM3P conference held in Doha, the 2020 AM3P conference continues the pavement mechanics theme including pavement models, experimental methods to estimate model parameters, and their implementation in predicting pavement performance. The AM3P conference is organized by the Standing International Advisory Committee (SIAC), at the time of this publication chaired by Professors Tom Scarpas, Eyad Masad, and Amit Bhasin. Advances in Materials and Pavement Performance Prediction II includes over 111 papers presented at the 2020 AM3P Conference. The technical topics covered include: - rigid pavements - pavement geotechnics - statistical and data tools in pavement engineering - pavement structures - asphalt mixtures - asphalt binders The book will be invaluable to academics and engineers involved or interested in pavement engineering, pavement models, experimental methods to estimate model parameters, and their implementation in predicting pavement performance.
Book Synopsis Evaluation of the Influence of Geogrid Reinforcement on Stiffness in Compacted Base Course Material by : Craig Schuettpelz
Download or read book Evaluation of the Influence of Geogrid Reinforcement on Stiffness in Compacted Base Course Material written by Craig Schuettpelz and published by . This book was released on 2008 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a Test Protocol for Cyclic Pullout of Geosynthetics in Roadway Base Reinforcement by : Timothy Michael Holley
Download or read book Development of a Test Protocol for Cyclic Pullout of Geosynthetics in Roadway Base Reinforcement written by Timothy Michael Holley and published by . This book was released on 2009 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geosynthetics, or manmade materials used in soils engineering, have successfully been used as base reinforcement of pavements for over 40 years. Use of geosynthetics can result in cost savings by allowing the aggregate base layer to be reduced in thickness and/or the service life of the pavement to be extended. Design methods for this type of reinforcement have typically been developed by individual manufacturers for specific products. These methods are not widely used by state transportation agencies because 1) they are proprietary, 2) they are empirically based, and 3) they lack compatibility with the current national trend towards mechanistic-empirical pavement design procedures. This project was initiated to develop testing methods to determine one of the critical material properties needed for mechanistic-empirical base-reinforced pavement design, namely, the resilient interface shear stiffness. This property describes the interaction, in particular the shear stiffness, between the geosynthetic and the surrounding aggregate. This new test protocol closely mimics vehicular load patterns, resulting in design parameters pertinent to the use of the geosynthetics to reinforce the base course. A study was conducted to evaluate the repeatability of these tests and to develop a standardized test method. Specific parameters under investigation include load pulse and rest period duration, embedment length of the geosynthetic, and differences in results using different soils and types of geosynthetics. Some parameters seemed to have little effect on values of resilient interface shear stiffness, while others vastly impacted the results. Load pulse and rest period durations did not affect output results significantly. Maintaining a constant confinement or shear stress during the test duration produced higher repeatability and correlated well to the adapted resilient modulus equation. Three-aperture length tests on polyester geogrid also correlated well with this equation, however repeatability was moderately low. Polypropylene geogrid and a woven geotextile confined in Ottawa sand displayed low correlation to this equation. During testing, very small displacements occur, and therefore, every effort should be made to ensure that these measurements are accurate and not skewed by electrical noise and interference.
Author :American Association of State Highway and Transportation Officials Publisher :AASHTO ISBN 13 :156051423X Total Pages :218 pages Book Rating :4.5/5 (65 download)
Book Synopsis Mechanistic-empirical Pavement Design Guide by : American Association of State Highway and Transportation Officials
Download or read book Mechanistic-empirical Pavement Design Guide written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 2008 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields by : Inge Hoff
Download or read book Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields written by Inge Hoff and published by CRC Press. This book was released on 2021-11-10 with total page 501 pages. Available in PDF, EPUB and Kindle. Book excerpt: Innovations in Road, Railway and Airfield Bearing Capacity – Volume 1 comprises the first part of contributions to the 11th International Conference on Bearing Capacity of Roads, Railways and Airfields (2022). In anticipation of the event, it unveils state-of-the-art information and research on the latest policies, traffic loading measurements, in-situ measurements and condition surveys, functional testing, deflection measurement evaluation, structural performance prediction for pavements and tracks, new construction and rehabilitation design systems, frost affected areas, drainage and environmental effects, reinforcement, traditional and recycled materials, full scale testing and on case histories of road, railways and airfields. This edited work is intended for a global audience of road, railway and airfield engineers, researchers and consultants, as well as building and maintenance companies looking to further upgrade their practices in the field.
Book Synopsis Bearing Capacity of Roads, Railways and Airfields by : Andreas Loizos
Download or read book Bearing Capacity of Roads, Railways and Airfields written by Andreas Loizos and published by CRC Press. This book was released on 2017-07-20 with total page 3209 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bearing Capacity of Roads, Railways and Airfields includes the contributions to the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields (BCRRA 2017, 28-30 June 2017, Athens, Greece). The papers cover aspects related to materials, laboratory testing, design, construction, maintenance and management systems of transport infrastructure, and focus on roads, railways and airfields. Additional aspects that concern new materials and characterization, alternative rehabilitation techniques, technological advances as well as pavement and railway track substructure sustainability are included. The contributions discuss new concepts and innovative solutions, and are concentrated but not limited on the following topics: · Unbound aggregate materials and soil properties · Bound materials characteritics, mechanical properties and testing · Effect of traffic loading · In-situ measurements techniques and monitoring · Structural evaluation · Pavement serviceability condition · Rehabilitation and maintenance issues · Geophysical assessment · Stabilization and reinforcement · Performance modeling · Environmental challenges · Life cycle assessment and sustainability Bearing Capacity of Roads, Railways and Airfields is essential reading for academics and professionals involved or interested in transport infrastructure systems, in particular roads, railways and airfields.
Book Synopsis Behavior of Geosynthetic-reinforced Aggregate Platforms Over Soft Subgrades by : Woon-Hyung Kim
Download or read book Behavior of Geosynthetic-reinforced Aggregate Platforms Over Soft Subgrades written by Woon-Hyung Kim and published by . This book was released on 2003 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recommendations for Design and Analysis of Earth Structures using Geosynthetic Reinforcements - EBGEO by : Deutsche Gesellschaft für Geotechnik
Download or read book Recommendations for Design and Analysis of Earth Structures using Geosynthetic Reinforcements - EBGEO written by Deutsche Gesellschaft für Geotechnik and published by John Wiley & Sons. This book was released on 2012-01-09 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: The completely revised and extended Recommendations deal with all questions relevant to the planning and dimensioning of geosynthetics-reinforced earth structures. In addition to the demands on materials and analysis principles, the applications of geosynthetics in a range of foundation systems, ground improvement measures, highways engineering projects, in slopes and retaining structures, and in landfill engineering are discussed. The Recommendations have been supplemented by the following sections: - reinforced earth structures over point or linear bearing elements, - foundation systems using geotextile-encased columns, - bridging subsidence, - dynamic actions of geosynthetic-reinforced systems. The remaining sections have been fundamentally revised and updated in line with current standards and codes of practice.
Book Synopsis Significant Findings from Full-scale Accelerated Pavement Testing by : Wynand JvdM. Steyn
Download or read book Significant Findings from Full-scale Accelerated Pavement Testing written by Wynand JvdM. Steyn and published by Transportation Research Board. This book was released on 2012 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: "TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 433: Significant Findings from Full-Scale Accelerated Pavement Testing documents and summarizes significant findings from the various experimental activities associated with full-scale accelerated pavement testing (f-sAPT) programs that have taken place between 2000 and 2011. The report also identifies gaps in knowledge related to f-sAPT and where future research may be needed. NCHRP Synthesis 433 is designed to expand the f-sAPT base of knowledge documented in NCHRP Syntheses 325 and 235, both with the same title of Significant Findings from Full-Scale Accelerated Pavement Testing. f-sAPT is the controlled application of a wheel loading, at or above the appropriate legal load limit, to a pavement system to determine pavement response in a compressed time period. The acceleration of damage is achieved by one or more of the following factors: increased repetitions, modified loading conditions, imposed climatic conditions, and thinner pavements with a decreased structural capacity which have shorter design lives"--
