Download or read book Nondestructive Testing of Pavements and Backcalculation of Moduli written by Albert Jasper Bush and published by ASTM International. This book was released on 1989 with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ILLI SLAB and FWD Deflection Basins for Characterization of Rigid Pavements written by MI. Darter and published by . This book was released on 1989 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deflection-based nondestructive evaluation methods for highway and airfield pavements rely wholly on mechanistic models of pavement behavior under load to characterize certain fundamental properties of individual pavement features (pavement section of similar thickness, construction history, and traffic). Once these key pavement parameters are quantified, areas of immediate concern can be identified for maintenance or rehabilitation, and an evaluation of the future performance of the entire feature can be made. The procedure sounds simple enough, until one tries to accomplish the task for an entire airfield which might contain well in excess of 200 distinct features. This paper details how the deflection basin created at the center of a rigid pavement slab under loads produced by the falling weight deflectometer (FWD) can be used in conjunction with the ILLI-SLAB finite-element model to backcalculate the two key parameters needed to characterize a classical Westergaard rigid pavement, a dynamic Young's Modulis (E) of the concrete surface, and a composite dynamic modulus of subgrade reaction (k) for the supporting layers of the system. The deflection basin is described in terms of two independent variables, the maximum deflection under the center of the FWD loading plate (D0) and the cross sectional "area" of the basin. The independent nature of these two variables is critical to the uniqueness of the backcalculated parameters. Using the ILLI-SLAB model, ranges of dynamic E and k that bound the actual field values are input to the computer, along with the actual FWD load, to produce a graphical solution. An iterative computer solution is then outlined that makes the task of backcalculating dynamic E and k for several hundred features more manageable. A correlation is presented that relates dynamic k values to traditional static k values determined from plate-bearing tests. Finally, comparisons between measured deflections in the field and predicted deflections using backcalculated parameters on the computer are made at center slab to verify the accuracy and repeatability of the technique for a wide variety of temperatures and thicknesses. It is only after the validity of the technique is established that confidence can be placed in the calculated stresses due to actual loads and, therefore, the evaluation itself.
Download or read book Temperature Differential Effect on the Falling Weight Deflectometer Deflections Used for Structural Evaluation of Rigid Pavements written by Gustavo E. Morales-Valentin and published by . This book was released on 1987 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rigid Pavement Analysis and Design written by K. W. Heinrichs and published by . This book was released on 1989 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evaluation of analysis models and design methods.
Download or read book Mechanistic Interpretation of Nondestructive Pavement Testing Deflections written by Mario S. Hoffman and published by . This book was released on 1981 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pavement Design and Analysis written by and published by . This book was released on 1995 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented at the 1995 TRB Annual Meeting.
Download or read book LTPP Rigid Pavement FWD Deflection Analysis and Backcalculation Procedure written by SD. Tayabji and published by . This book was released on 2000 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents the results of a falling weight deflectometer (FWD) deflection analysis study performed as a part of data analysis study under the Long-Term Pavement Performance (LTPP) program. The paper presents backcalculation procedures for rigid pavements adapted in this study and discusses the results of backcalculation. Backcalculation was performed using dense liquid (DL) and elastic solid (ES) subgrade models. Although backcalculated parameters determined in this study were found to be realistic for the majority of the LTPP rigid pavement sections, this study also uncovered some limitations of the current backcalculation procedures for rigid pavements. It was noted that backcalculated values may vary significantly due to factors such as temperature at the time of testing, slab curling conditions, time of day, and time of year. Current rigid pavement backcalculation technology is inappropriate to adequately address all of these matters; however, the LTPP database provides an excellent opportunity to conduct an in-depth study.
Download or read book Smart Systems Engineering written by Cihan H. Dagli and published by American Society of Mechanical Engineers. This book was released on 2006 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings Annie Conference, November 2006, St. Louis, Missouri. The newest volume in this series presents refereed papers in the following categories and their applications in the engineering domain: Neural Networks; Complex Networks; Evolutionary Programming; Data Mining; Fuzzy Logic; Adaptive Control; Pattern Recognition; Smart Engineering System Design. These papers are intended to provide a forum for researchers in the field to exchange ideas on smart engineering system design.
Download or read book Computational Models Software Engineering and Advanced Technologies in Air Transportation Next Generation Applications written by Weigang, Li and published by IGI Global. This book was released on 2009-10-31 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book disseminates knowledge on modern information technology applications in air transportation useful to professionals, researchers, and academicians"--Provided by publisher.
Download or read book Pavement Design written by National Research Council (U.S.). Transportation Research Board and published by Transportation Research Board National Research. This book was released on 1987 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic Analysis of FWD Test Results for Rigid Pavements written by L. Khazanovich and published by . This book was released on 2000 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper investigates the importance of accounting for the dynamic behavior of the rigid pavement system during falling weight deflectometer (FWD) testing. An analytical closed-form solution for dynamic loading of a plate on the Winkler foundation is derived and, using this solution, FWD sensor deflections are simulated and compared with the measured deflections. The lag between the peak of the applied FWD load and sensor deflections can be explained by the effects of pavement inertia and subgrade dumping. Nondimensional parameters that govern the dynamic behavior of a rigid pavement system are also identified.
Download or read book Dynaflect Testing for Rigid Pavement Evaluation written by and published by . This book was released on 1983 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Back calculation of Layer Parameters for LTPP Test Sections written by Harold L. Von Quintus and published by DIANE Publishing. This book was released on 2002 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design and Performance of Flexible Pavements written by National Research Council (U.S.). Transportation Research Board and published by Transportation Research Board National Research. This book was released on 1986 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transportation Research Record written by and published by . This book was released on 2000 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design and Evaluation of Rigid and Flexible Pavements written by National Research Council (U.S.). Transportation Research Board and published by . This book was released on 1990 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Final Summary Report written by Ernest J. Barenberg and published by . This book was released on 1991 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
