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 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 Use of Falling Weight Deflectometer Multi Load Level Data for Pavement Strength Estimation written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to describe a mechanistic-empirical approach to developing an analysis 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 pavement layers using multi-load level FWD deflections is presented in this study. The results indicate that the proposed procedure can estimate the base and subgrade layer conditions. However, large variations were observed in the relationships between the DBCI and desg values and the subgrade CBR values for aggregate base pavements. A FWD test with a load of 53 kN or less does not result in any apparent nonlinear behavior of the subgrade in aggregate base pavements. With regard to the condition assessment of the asphalt concrete (AC) layer, the AC layer modulus and the tensile strain at the bottom of the AC layer are found to be better indicators than the deflection basin parameter. The procedures for performance prediction of fatigue cracking and rutting are developed for flexible pavements. The drastically increasing trend in fatigue cracking with time may not be predicted accurately using the proposed procedure. Such trends may be due to the environmental effects and the inconsistent distress measurements. Predicted rut depths using both single and multi-load level deflections show good agreement with measured rut depths over a wide range of rutting potential. However, the procedure using single load level deflections consistently underpredicts the rut depths. This observation demonstrates that the rutting prediction procedure usin.

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 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 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 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 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 Simplified Techniques for Evaluation and Interpretation of Pavement Deflections for Network level Analysis written by and published by . This book was released on 2012 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to develop an approach for incorporating techniques to interpret and evaluate deflection data for network-level pavement management system (PMS) applications. The first part of this research focused on identifying and evaluating existing techniques, seeking out those that were simple, reliable, and easy to incorporate into current PMS practices, as well as those that produced consistent results. The second part of the research detailed the development of guidelines for the application of recommended techniques and procedures for determining optimum falling weight deflectometer (FWD) test spacing and data collection frequency. While there are many viable techniques available for evaluating the structural capacity of pavements that use FWD for project-level analysis, many of these techniques are time consuming and require an experienced analyst. As a result, using pavement deflection testing for network-level analysis has been limited to date. This guide provides information for the assessment of pavement structural performance for PMS applications. It reflects the general findings presented in the accompanying final report, Simplified Techniques for Evaluation and Interpretation of Pavement Deflections for Network-Level Analysis (FHWA-HRT-12-023).

Download or read book Use of Falling Weight Deflectometer Data for Assessing Pavement Structural Evaluation Values written by Mustaque Hossain and published by . This book was released on 1999 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Falling Weight Deflectometer Usage written by Sirous H. Alavi and published by Transportation Research Board National Research. This book was released on 2008 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: National Cooperative Highway Research Program.

Download or read book Proceedings written by and published by . This book was released on with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Condition Assessment of Flexible Pavements Using Falling Weight Deflectometer Data written by Kristy Lynn Wyatt Alford and published by . This book was released on 2000 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Temporal Fwd and Profile Measurements on Derived Pavement Parameters written by Hamad Bin Muslim and published by . This book was released on 2020 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evaluating a pavement's structural capacity involves analyzing deflections measured by Falling Weight Deflectometer (FWD) while assessing surface roughness, estimated from longitudinal profile measurements, helps determine its functional performance. However, seasonal and diurnal changes (temperature and moisture) influence such measurements. Evaluating temporal variations and quantifying their impact on these measurements may aid in a better understanding of pavement parameters derived from these measurements. Long-Term Pavement Performance (LTPP) Seasonal Monitoring Program (SMP) study is designed to understand environmental factors and their effects on pavement structural and functional performance. Analyzing data from the SMP study shows that FWD and profile measurement season and time of the day have a significant impact on parameters derived from these measurements. Relating the observed effects with recorded ambient temperatures helped developing general guidelines for FWD and profile measurements in different climatic regions.The recommended temperature range for FWD testing on rigid and flexible pavements in freeze climates is 55 to 70oF; 65 to 75oF and 60 to 75oF in the non-freeze climates for flexible and rigid pavements, respectively. The study recommends before-noon FWD testing for rigid, while no time limit within a day for the flexible pavements. Also, the research suggests a temperature range between 50 to 75oF for flexible pavement profiles with no time limitation. For rigid pavements, profile measurements in the afternoon are recommended with temperature ranges of 50 to 65oF, and 50 to 70oF in freeze and non-freeze climates, respectively.

Download or read book Testing Program for the Falling weight Deflectometer written by M. Makbul Hossain and published by . This book was released on 1995 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Predicting Flexible Pavement Structural Response Using Falling Weight Deflectometer Deflections written by Jianfeng Qin and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: