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Author : MohammadReza Sharbaf
Publisher :
ISBN 13 : 9783330650152
Total Pages : 156 pages
Book Rating : 4.6/5 (51 download)
Download or read book Laboratory Evaluation of Geogrid-Reinforced Flexible Pavements written by MohammadReza Sharbaf and published by . This book was released on 2017-02-25 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Murad Yusuf Abu-Farsakh
Publisher :
ISBN 13 :
Total Pages : 79 pages
Book Rating : 4.:/5 (793 download)
Download or read book Evaluation of the Base/subgrade Soil Under Repeated Loading written by Murad Yusuf Abu-Farsakh and published by . This book was released on 2012 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Murad Yusuf Abu-Farsakh
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (1 download)
Download or read book Evaluation of the Base/subgrade Soil Under Repeated Loading written by Murad Yusuf Abu-Farsakh and published by . This book was released on 2009 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 31 pages
Book Rating : 4.:/5 (163 download)
Download or read book Laboratory Evaluation of Geosynthetic Reinforced Pavement Sections written by and published by . This book was released on 1994 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Karen S. Henry
Publisher :
ISBN 13 :
Total Pages : 62 pages
Book Rating : 4.:/5 (245 download)
Download or read book Construction and Instrumentation of Full-scale Geogrid Reinforced Pavement Test Sections written by Karen S. Henry and published by . This book was released on 2008 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Timothy E. Smith
Publisher :
ISBN 13 :
Total Pages : 482 pages
Book Rating : 4.:/5 (324 download)
Download or read book Laboratory Performance of Geogrid and Geotextile Reinforced Flexible Pavements written by Timothy E. Smith and published by . This book was released on 1994 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Qiming Chen
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (125 download)
Download or read book Laboratory Evaluation of Geogrid Base Reinforcement and Corresponding Instrumentation Program written by Qiming Chen and published by . This book was released on 2009 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of geogrid base reinforcement in pavement on weak subgrade under cyclic plate load testing was studied. The performance of instrumentation sensors was also evaluated to improve future instrumentation programs. The tests were conducted inside a test box of dimensions of 2.0×2.0×1.7 m3 using a servo-hydraulic actuator. A 40-kN load at a frequency of 0.77 Hz was applied through a 305-mm-diameter steel plate. The sensors used included linear variable displacement transducers, pressure cells, bondable foil strain gages, and piezometers. The test results showed that the inclusion of geogrid at the subgrade/base course layer interface can significantly improve the performance of flexible pavement on weak subgrade (California bearing ratio=0.5 %) and that the traffic benefit ratio can be increased up to 3.5 for a rutting depth of 25 mm. The test results also showed that the reinforcement can redistribute the applied load to a wider area, thus achieving an improved stress distribution on the subgrade, which will eventually reduce the permanent deformation of subgrade. The bondable foil strain gages are unsuitable for long-time continuous monitoring of strain development within geogrid under high number of cyclic loading.
Author : Tim E. Smith
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (589 download)
Download or read book Laboratory Behavior of Geogrid and Geotextile Reinforced Flexible Pavements written by Tim E. Smith and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Steven W. Perkins
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.:/5 (1 download)
Download or read book Feasibility of the Use of Existing Analytical Models and Experimental Data to Assess Current Design Methods for Pavement Geogrid-reinforced Base Layers written by Steven W. Perkins and published by . This book was released on 1995 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years polymer geogrids have been proposed and used to improve the performance of paved roadways and/or to reduce base course thickness. Performance improvements have been demonstrated for design conditions where relatively large rut depths are acceptable and where relatively weak pavement sections have been used. This work was undertaken to examine existing literature concerning laboratory and field experimental studies, and analytical studies pertaining to the inclusion of geogrid polymer materials in roadway pavement sections for the purpose of improving performance or to allow for a reduction in the constructed section thicknesses. The original goal of this study was to examine the feasibility of using existing data from laboratory or field studies and existing finite element models to validate and calibrate the model and then use the model to predict the response of pavement sections not included in the experimental studies. This study has indicated that this approach is feasible and has been accomplished by a previous project. Furthermore, the literature reviewed in this study has shown conflicting results pertaining to the level of improvement that is realized by inclusion of a geogrid in the base course layer of a pavement section. While additional laboratory and analytical studies may aid in resolving these conflicts it is concluded that the most productive approach at this point is to construct well instrumented, full scale field sections to assess improvement levels. These sections should be designed and constructed to include variables identified in previous studies as having the greatest impact on pavement performance.
Author : Sarah R. Jersey
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (824 download)
Download or read book Full-scale Evaluation of Geogrid-reinforced Thin Flexible Pavements written by Sarah R. Jersey and published by . This book was released on 2012 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gael Souci
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (15 download)
Download or read book Laboratory Characterization of Geogrid-reinforced Unbound Granular Material for Use in Flexible Pavement Structures written by Gael Souci and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yang Hsien Huang
Publisher :
ISBN 13 : 9780132726108
Total Pages : 775 pages
Book Rating : 4.7/5 (261 download)
Download or read book Pavement Analysis and Design written by Yang Hsien Huang and published by . This book was released on 2004 with total page 775 pages. Available in PDF, EPUB and Kindle. Book excerpt: For one/two-semester, undergraduate/graduate courses in Pavement Design. This up-to-date text covers both theoretical and practical aspects of pavement analysis and design. It includes some of the latest developments in the field, and some very useful computer software-developed by the author-with detailed instructions.
Author : Steven W. Perkins
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.:/5 (414 download)
Download or read book Geosynthetic Reinforcement of Flexible Pavements written by Steven W. Perkins and published by . This book was released on 1999 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the course of the last 17 years, approximately 12 different studies have shown the potential for the use of geosynthetic materials (geogrids and geotextiles) as a reinforcement inclusion in the base course aggregate layer of flexible pavements. The attraction of this application lies in the possibility of reducing the thickness of the base course layer such that a roadway of equal service life results or in extending the service life of the roadway. While several existing studies have provided data that aid in describing mechanisms of reinforcement, detailed information required to understand the mechanisms by which geosynthetics reinforce flexible pavements is lacking. In the absence of this information, it has historically been difficult to create mechanistic based models that adequately describe the process. As such, efforts to establish design solutions have been based largely on empirical data and considerations. Existing design solutions have not been met with open acceptance due to their inability to predict performance for conditions other than those established in the experiments for which the solution was based. This research was undertaken to provide experimental data that could be used to further establish the mechanisms of geosynthetic reinforcement that lead to enhanced pavement performance. Subsequent work will involve the use of these data in developing numerical models and design solutions for this application. Pavement test sections have been constructed in a laboratory based pavement test facility. The facility consists of a large concrete box in which field scale pavement layers can be constructed. Loading is provided through the application of a cyclic, 40 kN load applied to a stationary plate resting on the pavement surface. The test sections have been instrumented with an extensive series of stress and strain cells. Test section variables have included geosynthetic type (two biaxial geogrid products and one woven geotextile), subgrade type and strength, placement position of the geosynthetic in the base course layer and base course layer thickness. The results have shown that the inclusion of a geosynthetic provides a significant reinforcement effect. The geosynthetic is shown to have an influence on the amount of lateral spreading that occurs in both the bottom of the base course layer and in the top of the subgrade. Reinforcement is also seen to produce a more distributed vertical stress distribution on the top of the subgrade. As a result of these effects, reinforcement limits the vertical strain developed in the base and subgrade layers, leading to less surface deformation. Given that these mechanisms result from the development of shear interaction between the base and the geosynthetic, the combination of these effects is termed a mechanism of a shear resisting interface. These effects are seen to be most significant for a soft subgrade where substantial improvement in pavement performance has been observed. Geosynthetic type, strength, stiffness and placement position are also seen to influence observed improvement.
Author : Jayhyun Kwon
Publisher :
ISBN 13 : 9780549096191
Total Pages : 241 pages
Book Rating : 4.0/5 (961 download)
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.
Author : American Society of Civil Engineers
Publisher : Amer Society of Civil Engineers
ISBN 13 : 9780784411049
Total Pages : 592 pages
Book Rating : 4.4/5 (11 download)
Download or read book Paving Materials and Pavement Analysis written by American Society of Civil Engineers and published by Amer Society of Civil Engineers. This book was released on 2010 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pavement Design And Paving Material Selection are important for efficient, cost effective, durable, and safe transportation infrastructure Paving Materials and Pavement Analysis contains 73 papers examining bound and unbound material characterization, modeling, and performance of highway and airfield pavements. The papers in this publication were presented during the GeoShanghal 2010 International Conference held in Shanghai, China, June 3-5, 2010.
Author : Subramanian Sankaranarayanan
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)
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
Author : Robert M. Koerner
Publisher :
ISBN 13 :
Total Pages : 680 pages
Book Rating : 4.3/5 (91 download)
Download or read book Designing with Geosynthetics written by Robert M. Koerner and published by . This book was released on 1990 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geosynthetic materials have entered the mainstream in the professional arena and are no longer considered new construction material. Professionals need to keep up with the nuances of how geosynthetics work. Emphasizes design by function; overviews all types of geosynthetics, with stand-alone units on particular materials. Uses S.I. units for all problems and examples. Expands coverage of containers and tubes in the geotextile chapter. Discusses walls and slope design, including seismic analysis, in the geogrid chapter. Treats wet landfills, agricultural waste, waste stability, and dam waterproofing in the geomembrane chapter. Discusses new products and related performances in the geosynthetic clay liner chapter. Discusses new products and related behavior, including fiber reinforcement and wall drainage, in the geocomposite chapter. Adds a completely new chapter on geofoam. A useful reference for transportation, geotechnical, environmental, and hydraulics professionals and engineers.
