Download or read book Harmonisation of the Use of the Falling Weight Deflectometer on Pavements written by and published by . This book was released on 1996 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Harmonisation of the Use of the Falling Weight Deflectometer on Pavements written by Forum of European National Highway Research Laboratories and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Harmonisation of the Use of the Falling Weight Deflectometer on Pavements Part 1 Harmonisation of FWD Measurements and Data Processing for Flexible Road Pavement Evaluation written by and published by . This book was released on 1996 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Harmonisation of the Use of the Falling Weight Deflectometer on Pavements written by Forum of European National Highway Research Laboratories and published by . This book was released on 1996 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 The Use of Falling Weight Deflectometer Data in Monitoring Flexible Pavement Systems written by NC. Jackson and published by . This book was released on 1989 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pavement performance studies are being conducted in the states of Nevada and Washington for the purpose of developing mechanistically based pavement design procedures for highways. A critical element of each of these studies is the statewide characterization of the pavement materials. The materials characterization process has included laboratory and field testing for 16 sites in Washington and 27 sites in Nevada.
Download or read book Pavement Design and Development of the Falling Weight Deflectometer written by Jeffrey Goode and published by . This book was released on 1993 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Compliance Testing Using the Falling Weight Deflectometer for Pavement Construction Rehabilitation and Area Wide Treatments written by and published by . This book was released on 2009 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Falling Weight Deflectometer for Nondestructive Evaluation of Rigid Pavements written by and published by . This book was released on 1985 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic Interpretation of Dynaflect and Falling Weight Deflectometer Tests on Pavement Systems written by Ko-Young Shao and published by . This book was released on 1986 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Dynaflect and the Falling Weight Deflectometer are commonly used for nondestructive testing of pavements. Although in both cases a dynamic load is imparted, the determination of the mechanical properties of the pavement is normally performed by using static analyses. In this study, the displacements obtained from dynamic analyses are compared to those provided by conventional static programs when the subbase is a homogeneous soil stratum of finite depth, resting on a much stiffer rock-like material and when the soil properties increase smoothly with depth, as is often the case.
Download or read book Comparison of the Falling Weight Deflectometer and the Dynaflect for Pavement Evaluation written by Bary Eagleson and published by . This book was released on 1982 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: A literature search was made for the purpose of comparing deflection measuring devices. The Dynaflect, Road Rater, and Falling Weight Deflectometer (FWD) ranked highest when compared, using the criteria of cost, operational characteristics, and suitability. Field testing proved the Dynaflect and FWD were nearly equal in overall ability except in operational speed. Here the Dynaflect was superior primarily due to the automated sensor placement. The correlation coefficients obtained showed good agreement between the deflections measured by the two devices on all pavements tested except overlaid CRCP. This study indicates that there may be pavements and conditions for which the Dynaflect does not provide useful information or where present methods of data interpretation do not appear to be adequate.
Download or read book The Use of Falling Weight Deflectometer in Asphalt Pavement Construction Quality Control written by SM. Zaghloul and published by . This book was released on 1996 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Good quality control (QC) practices are essential to obtain satisfactory pavements. Typical QC tests for asphalt pavements include: asphalt content, mixture properties of laboratory samples, density, ..., etc. Results of these tests are used to ensure that the constructed pavements comply to specifications. However, quality of compliance to specifications and quality performance are two different things and are not always directly related to each other. The ultimate goal of QC is to have high quality of performance. However, efforts are made to achieve this goal by using laboratory based specifications, which are empirically related to field performance.
Download or read book Interpreting Data from the Falling weight Deflectometer written by and published by . This book was released on 1994 with total page 70 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 Temperature Adjustment Factors for Falling Weight Deflectometer Deflections on Full Depth Asphalt Concrete Pavements written by Ronald Netemeyer and published by . This book was released on 1997 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
