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 Nondestructive Testing of Pavements and Backcalculation of Moduli written by Shiraz D. Tayabji and published by ASTM International. This book was released on 2000 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: As with the previous two symposia, the 32 papers from the June/July, 1999, Seattle symposium present advances in the nondestructive testing of pavements using conventional falling weight deflectometer techniques and other promising techniques such as ground penetrating radar, rolling weight deflecto
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 Evaluation of the Falling Weight Deflectometer 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:
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 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 Non destructive Testing written by and published by . This book was released on 1988 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-destructive testing of pavement structures can be achieved by accurately measuring and interpreting deflection data. this paper describes a computer program designed for simple and fast processing of deflection data collected using a falling weight deflectometer (fwd). a set of diagnostic parameters are calculated: first, maximum horizontal strain in the asphalt concrete (ac) under the test load, directly via the corresponding maximum curvature; next, the elastic stiffness (or young's modulus) of the subgrade; and finally, the vertical stress, strain and deflection on top of the subgrade, by means of an improved method of equivalent layer thickness. the actual stresses, strains, and deflections at test conditions can be normalized for standard ac temperature and standard test load. diagnostic and design applications are discussed. comparisons are made with parallel elastic layer analysis computations. for the covering abstract of the conference see irrd 807201.
Download or read book Environmental Effects on the Non destructive Evaluation of Plain Jointed Concrete Pavements Using Falling Weight Deflectometer written by Satish Babu Kodavali and published by . This book was released on 1994 with total page 238 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 Evaluation of Concrete Pavements Using Nondestructive Testing Techniques written by Ernest J. Barenberg and published by . This book was released on 1988 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: An evaluation of NDT equipment and acquisition of a Falling Weight Deflectometer (FWD) for the Illinois Department of Transportation was accomplished. This was followed by an extensive testing program using the FWD to evaluate concrete pavements in Illinois. Test results were evaluated and procedures developed for testing and evaluation of jointed and continuously reinforced concrete pavements. Results show that some causes of incipient distresses can be detected using the FWD device including subgrade strength, loss of load transfer and development of voids. Recommendations for rehabilitations are presented in the final report.
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 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 Nondestructive Deflection Testing and Backcalculation for Pavements written by National Research Council (U.S.). Transportation Research Board and published by Transportation Research Board National Research. This book was released on 1992 with total page 216 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 Determining Asphaltic Concrete Pavement Structural Properties by Nondestructive Testing written by National Research Council (U.S.). Transportation Research Board and published by Transportation Research Board. This book was released on 1990 with total page 116 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 CTD measurements during 1999 and 2000 as part of the Global OceanAtmosphereLand System GOALS Pan American Climate Studies PACS written by and published by DIANE Publishing. This book was released on with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
