Download or read book Analytical empirical Pavement Evaluation Using the Falling Weight Deflectometer written by Per Ullidtz and published by . This book was released on 1985 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Using Falling Weight Deflectometer Data with Mechanistic empirical Design and Analysis written by Kurt D. Smith and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The need to accurately characterize the structural condition of existing pavements has increased with the recent development, release, and ongoing implementation of the Mechanistic-Empirical Pavement Design Guide (MEPDG). A number of different material inputs are required in the procedure, and it is important to adequately characterize and define them. The analysis of deflection data collected by the falling weight deflectometer (FWD) provides a quick and reliable way to characterize the properties of the paving layers, as well as to assess the load-carrying capacity of existing pavement structures. With the release of the new MEPDG, there is a pressing need to identify and evaluate the way that FWD testing is integrated into the new design procedure. Moreover, as highway agencies continue to implement the MEPDG, they need best practices guidance on how to effectively test existing pavement structures and interpret the results as part of a mechanistic-empirical pavement evaluation and rehabilitation process.

Download or read book Enhanced Analysis of Falling Weight Deflectometer Data for Use with Mechanistic empirical Flexible Pavement Design and Analysis and Recommendations for Improvements to Falling Weight Deflectometers written by Karim Chatti and published by . This book was released on 2017 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the efforts undertaken to review the status of falling weight deflectometer (FWD) equipment, data collection, analysis, and interpretation, including dynamic backcalculation, as they relate to the models and procedures incorporated in the Mechanistic-Empirical Pavement Design Guide. The work conducted in this project resulted in the following: Development of a backcalculation scheme (BACKLAVA) in the time domain using a quasi-static model (LAVA) as its forward solution and genetic algorithm (GA) as its search engine. BACKLAVA is a backcalculation algorithm for a constant asphalt concrete (AC) layer temperature. Development of a backcalculation scheme (BACKLAVAP) in the time domain using a quasi-static model (LAVAP) as its forward solution and GA as its search engine. BACKLAVAP is a backcalculation algorithm for a temperature profile in an AC layer. Development of a backcalculation scheme (BACKLAVAN) in the time domain using a quasi-static model (LAVAN) as its forward solution and GA as its search engine. BACKLAVAN is a backcalculation algorithm for a viscoelastic AC layer and a nonlinear base layer. Development of a backcalculation scheme (DYNABACK-VE) in the time domain using a time-domain viscoelastic dynamic model (ViscoWave-II) as its forward solution and a hybrid approach (GA and Levenberg-Marquardt algorithm) as its search engine. DYNABACK-VE is a backcalculation algorithm for a viscoelastic AC layer with temperature profile and linear unbound layers. Short list of recommendations for FWD equipment enhancements. The tools developed in this project are standalone applications that could be used on most computers.

Download or read book Pavement Analysis written by Per Ullidtz and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides some simple methods for the analysis of pavements in order to describe their present condition and to predict their future condition. Functional and structural conditions of flexible and rigid highway and airfield pavements are treated.

Download or read book Pavement Evaluation with the Falling Weight Deflectometer written by A.I.M. Claessen and published by . This book was released on 1976 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pavement Analysis written by Per Ullidtz and published by Elsevier Science Limited. This book was released on 1987-01-01 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides some simple methods for the analysis of pavements in order to describe their present condition and to predict their future condition. Functional and structural conditions of flexible and rigid highway and airfield pavements are treated. The book has been designed to assist the engineer in answering such questions as: What is the bearing capacity of a pavement structure? How good is the ''ride'' quality? How quickly will the pavement deteriorate? What will be the effects of a particular maintenance or rehabilitation measure? How much should be invested in maintaining road networks in order to obtain the highest rate of return on the investment? The analytical-empirical (or mechanistic-empirical) method has long been recognized as a proper engineering method for pavement evaluation. Its more widespread use has been hindered by the difficulties of determining the fundamental input parameters, but recent developments like the Falling Weight Deflectometer are rapidly changing this situation. The book discusses all important aspects of structural as well as functional evaluation and presents a number of useful mathematical models that are easily programmed on a microcomputer or incorporated in a spreadsheet. The book is written primarily for engineers involved in the design or maintenance of pavement structures and for engineering students interested in this subject. Some of the more advanced methods for computer simulation of pavement performance will be of interest to engineers engaged in pavement research, and the description of pavement management systems will also be of interest to those in airport administration, highway agencies etc.

Download or read book Independent Review of the Mechanistic empirical Pavement Design Guide and Software written by and published by . This book was released on 2006 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This digest summarizes key findings from NCHRP Project 1-40A ... Part I ... was prepared by Stephen F. Brown, Scott Wilson Pavement Engineering, Ltd.; Part II was prepared by Michael M. Darter .... Applied Research Associates, Inc. ... [et al.]"--P. [1].

Download or read book Pavement Evaluation in Florida Using the Falling Weight Deflectometer written by Jatinder Sharma and published by . This book was released on 1979 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Case Studies Using Falling Weight Deflectometer Data with Mechanistic empirical Design and Analysis written by Kurt D. Smith and published by . This book was released on 2012 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need to accurately characterize the structural condition of existing pavements has increased with the recent development, release, and ongoing implementation of the Mechanistic-Empirical Pavement Design Guide (MEPDG), developed under National Cooperative Highway Research Program Project No. 1-37A. A number of different material inputs are required in the procedure, and it is important that these be adequately characterized and defined so that competent structural designs can be developed. The analysis of deflection data collected with a falling weight deflectometer (FWD) provides a quick and reliable way of characterizing many of the parameters of the existing pavement layers. This paper summarizes how deflection data are incorporated into the MEPDG and describes two case studies, one with a flexible pavement and one with a rigid pavement. Significant findings and recommendations from the evaluated flexible pavement case study include the following: surface-down cracking is critical in the design of the hot mix asphalt (HMA) overlay, correction factors should be used for adjusting backcalculated layer moduli to laboratory determined values, and an FWD testing frequency of 30 Hz should be used for estimating the existing HMA modulus. For rigid pavements, the case study found that the thinnest overlay produced from the MEPDG was a bonded Portland cement concrete (PCC) overlay, whereas the HMA overlay was unreasonably thick. Within the design procedure, the manually entered k-value is used for unbonded and bonded jointed plain concrete pavements but does not appear to be used by the program in the HMA overlay design. The backcalculated dynamic (or static) elastic modulus should be used for the PCC layer, and the dynamic k-value should be used for the supporting layers. The backcalculated k-value representing the composite stiffness of all layers beneath the slab does not appear to have a significant influence on the design thickness for the pavement structure analyzed.

Download or read book Use of Falling Weight Deflectometer Data for Assessing Pavement Structural Evaluation Values written by Tanveer Chowdhury and published by . This book was released on 1999 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural evaluation can be very useful at the network level for project prioritization purposes. In the project priority ranking procedure of the Kansas Department of Transportation (KDOT), a pavement rating attribute, Pavement Structural Evaluation (PSE), is used. These ratings are subjective. his study outlines an approach based on the classical multiple regression analysis resulting in a better estimation of the PSE values using the results from the Falling Weight Deflectometer (FWD) tests and network-level distress survey. The regression models proposed in this study predict the decrease in PSE values by taking into account the FWD data, age, thickness, and distress levels of pavements, and very closely approximate the current PSE ratings obtained at the district level.

Download or read book Use of Falling Weight Deflectometer Multi load Data for Pavement Strength Estimation written by Y. Richard Kim and published by . This book was released on 2002 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to develop a mechanistic-empirical method for assessing pavement layer conditions and estimating the remaining life of flexible pavements using multi-load level Falling Weight Deflectometer (FWD) deflections. A dynamic finite element program, incorporating a stress-dependent soil model, was developed to generate the synthetic deflection database. Based on this synthetic database, the relationships between surface deflections and critical pavement responses, such as stresses and strains in each individual layer, have been established. A condition assessment procedure for asphalt pavements that uses multi-load level FWD deflections has been developed using these relationships. The verification study was conducted using field data.

Download or read book Implementation of Falling Weight Deflectometer Technology and Development of Analytical Pavement Design in Thailand written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nondestructive Testing of Pavements and Backcalculation of Moduli written by ASTM Committee D-18 on Soil and Rock. Subcommittee D-4 on Road and Paving Materials and published by ASTM International. This book was released on 1994 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of June 1993 international symposium held in Atlanta, Georgia, called specifically to develop and standardized evaluation procedures for non-destructive methods of testing pavements. The 29 papers discuss analytical models and techniques, measurement and calculation techniques in the field and laboratory, problems and errors associated with backcalculation methods and design parameters, and testing for other pavement uses. Also includes a history of the quest for a standard and the status of that effort. Reproduced from typescripts. Annotation copyright by Book News, Inc., Portland, OR

Download or read book Pavement Evaluation and Overlay Design Using Falling Weight Deflectometer and Other Deflection Measurement Devices written by A. A. A. Molenaar and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pavement Evaluation with Particular Reference to Deflection Testing with a Falling Weight Deflectometer written by Duraid Muayed Abd and published by . This book was released on 2011 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pavement Evaluation with a Non destructive Method written by Amin Rezaeezadeh and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Special Report written by and published by . This book was released on 1989 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: