An Improved Permanent Deformation Model For Unbound Aggregate Base Course
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Author | : Charles Vance Droddy |
Publisher | : |
Total Pages | : |
Release | : 2015 |
Genre | : |
ISBN | : |
Permanent deformation of unbound base course materials under flexible pavements continue to be a significant source of the rutting observed at the surface. The permanent deformation behavior of unbound aggregate bases (UAB) has been documented by several authors. Several models have been proposed to predict the permanent deformation (rutting) occurring in the UAB. Most of the models do not take into account the stress dependent characteristics of UAB or have parameters which vary with stress state. An improved model has been developed at Texas A&M University which includes the stress dependency in the model and this new approach has been validated. This new model incorporates power functions of the first and second invariants of the stress tensor directly in the model along with the [lowercase Epsilon symbol]0 , [lowercase Rho symbol] , and [lowercase Beta symbol] from existing single stage models. Several previous models attempted to achieve this by using the stress as a parameter in the fitting coefficients. This left many with relatively low values of R2 or with widely varying coefficients for a range of stress states. By using the stress state directly in the model, a generalized set of fitting parameters for a given material type have been generated. Using these generalized fitting parameters, it is shown that the new model fits the experimental data on a fundamental level. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/155556
Author | : A. Gomes Correia |
Publisher | : |
Total Pages | : 231 |
Release | : 1999 |
Genre | : |
ISBN | : |
Author | : Douglas M. Marshall |
Publisher | : CRC Press |
Total Pages | : 1944 |
Release | : 2015-10-26 |
Genre | : Political Science |
ISBN | : 113802693X |
The proliferation of technological capability, miniaturization, and demand for aerial intelligence is pushing unmanned aerial systems (UAS) into the realm of a multi-billion dollar industry. This book surveys the UAS landscape from history to future applications. It discusses commercial applications, integration into the national airspace system (NAS), System function, operational procedures, safety concerns, and a host of other relevant topics. The book is dynamic and well-illustrated with separate sections for terminology and web- based resources for further information.
Author | : Eyad Masad |
Publisher | : CRC Press |
Total Pages | : 596 |
Release | : 2018-07-16 |
Genre | : Technology & Engineering |
ISBN | : 042985580X |
Advances in Materials and Pavement Performance Prediction contains the papers presented at the International Conference on Advances in Materials and Pavement Performance Prediction (AM3P, Doha, Qatar, 16- 18 April 2018). There has been an increasing emphasis internationally in the design and construction of sustainable pavement systems. Advances in Materials and Pavement Prediction reflects this development highlighting various approaches to predict pavement performance. The contributions discuss links and interactions between material characterization methods, empirical predictions, mechanistic modeling, and statistically-sound calibration and validation methods. There is also emphasis on comparisons between modeling results and observed performance. The topics of the book include (but are not limited to): • Experimental laboratory material characterization • Field measurements and in situ material characterization • Constitutive modeling and simulation • Innovative pavement materials and interface systems • Non-destructive measurement techniques • Surface characterization, tire-surface interaction, pavement noise • Pavement rehabilitation • Case studies Advances in Materials and Pavement Performance Prediction will be of interest to academics and engineers involved in pavement engineering.
Author | : J. R. Barrett |
Publisher | : |
Total Pages | : 20 |
Release | : 1977 |
Genre | : Pavements |
ISBN | : |
Author | : D. Manzanal |
Publisher | : IOS Press |
Total Pages | : 3344 |
Release | : 2015-12-11 |
Genre | : Technology & Engineering |
ISBN | : 1614996032 |
The work of geotechnical engineers contributes to the creation of safe, economic and pleasant spaces to live, work and relax all over the world. Advances are constantly being made, and the expertise of the profession becomes ever more important with the increased pressure on space and resources. This book presents the proceedings of the 15th Pan-American Conference on Soil Mechanics and Geotechnical Engineering (XV PCSMGE), held in Buenos Aires, Argentina, in November 2015. This conference, held every four years, is an important opportunity for international experts, researchers, academics, professionals and geo-engineering companies to meet and exchange ideas and research findings in the areas of soil mechanics, rock mechanics, and their applications in civil, mining and environmental engineering. The articles are divided into nine sections: transportation geotechnics; in-situ testing; geo-engineering for energy and sustainability; numerical modeling in geotechnics; foundations and ground improvement; unsaturated soil behavior; embankments, dams and tailings; excavations and tunnels; and geo-risks, and cover a wide spectrum of issues from fundamentals to applications in geotechnics. This book will undoubtedly represent an essential reference for academics, researchers and practitioners in the field of soil mechanics and geotechnical engineering. In this proceedings, approximately 65% of the contributions are in English, and 35% of the contributions are in Spanish or Portuguese.
Author | : E. Tutumluer |
Publisher | : |
Total Pages | : 180 |
Release | : 2013 |
Genre | : Aggregates (Building materials) |
ISBN | : |
"TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 445: Practices for Unbound Aggregate Pavement Layers consolidates information on the state-of-the-art and state-of-the-practice of designing and constructing unbound aggregate pavement layers. The report summarizes effective practices related to material selection, design, and construction of unbound aggregate layers to potentially improve pavement performance and longevity."--Publisher website.
Author | : E. J. Yoder |
Publisher | : John Wiley & Sons |
Total Pages | : 732 |
Release | : 1991-01-08 |
Genre | : Technology & Engineering |
ISBN | : 9780471977803 |
Presents a complete coverage of all aspects of the theory and practice of pavement design including the latest concepts.
Author | : American Association of State Highway and Transportation Officials |
Publisher | : AASHTO |
Total Pages | : 622 |
Release | : 1993 |
Genre | : Pavements |
ISBN | : 1560510552 |
Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.
Author | : R. H. Jones |
Publisher | : Butterworth-Heinemann |
Total Pages | : 448 |
Release | : 1989 |
Genre | : Technology & Engineering |
ISBN | : |
The edited, reorganized, and supplemented proceedings of an international symposium at the U. of Nottingham, England, April 1989. The focus is on current practice and recent developments in the use of crushed rock, natural gravels, and man-made aggregates in roads, unbound by cement or bitumen. Several general reports provide an overview. A keynote address introduces each of the sections, which discuss placing and compaction, drainage, and permeability, mechanical properties and durability, alternative materials (for example, steel slags, and waste material) design philosophy, specification and compliance, evaluating in situ performance, and conclusions and recommendations. Describes the pan-European standardization, and practices and specifications in France, West Germany, Italy, Portugal, Singapore, Scandinavia, the U.K., the U.S., and developing countries. Of interest to road designers, contractors, suppliers, materials engineers, researchers, and standards organizations. Annotation copyrighted by Book News, Inc., Portland, OR