Download or read book Use of Nondestructive Evaluation to Detect Moisture in Flexible Pavements written by Brian K. Diefenderfer and published by . This book was released on 2006 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to identify the currently available nondestructive evaluation technology that holds the greatest potential to detect moisture in flexible pavements and then apply the technology in multiple locations throughout Virginia. Ground-penetrating radar (GPR) was chosen for use in a field investigation because of its ability to measure large areal extents and reports of successful implementation by other researchers. This technology was used to determine the moisture content of the subgrade beneath five flexible pavement sections in Virginia. The GPR survey was conducted at normal driving speeds, and data were collected at a sampling rate of 1 scan per foot. For each site, three scans were collected in the travel lane (in the right wheel path, the center of the lane, and in the left wheel path). Existing passing lanes were also scanned. Initial data processing subdivided each pavement section into a three-layer system composed of the hot-mix asphalt layers, the aggregate base layers, and the subgrade. The processing also included calculating the dielectric constant of each layer. These raw data were used to conduct further analyses considering data from only the subgrade. The data were normalized to highlight those areas with the highest dielectric constants since it is known that moisture will have the greatest influence on the dielectric properties of the material. This study showed that GPR can identify areas of varying dielectric constant attributed to variations in the moisture content of the subgrade of various pavement sections. The use of the GPR offered a safe and rapid means for nondestructively surveying large areas of pavement as the survey was conducted at normal driving speeds. In addition, the use of a statistically based data normalization procedure allowed GPR to be used to assess qualitatively the moisture condition of the subgrade of flexible pavements. Two advantages of GPR testing are that it can be used to provide a continuous reading of subgrade moisture conditions (rather than a point location) and can be performed at highway speeds with no traffic control. A typical network-level study involving one subgrade bore per mile would cost $1,200 per location. The cost for the current study averaged $0.04 per data point. Assuming one data point every foot and three scans per lane, the resultant cost was approximately $680 per mile. VDOT maintains approximately 225 lane-miles of flexible pavement with subsurface drainage layers and does not routinely inspect the condition of the outlet pipes. In approximately 1 workday, a two-person crew could use a push camera to inspect approximately 5 lane-miles worth of outlet pipes for subsurface drainage layers or the GPR system could scan approximately 330 lane-miles (assuming operation at 55 mph for 6 hours). Thus, the entire system of flexible pavement with subsurface drainage could be inspected in approximately 2% of the time.

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 Flexible Pavements written by Jim W. Hall and published by . This book was released on 1970 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review of literature concerned with the nondestructive testing of flexible pavements, and two types of testing methods are presented in this report. The first method deals with the measurement of pavement response through the deflection of the pavement surface. Effect of the loading characteristics, pavement structure, and environment on measured deflections are discussed. Experience has shown that deflections of certain magnitudes are associated with failure. Bending strain has also been associated with failure through field measurements of radius of curvature of the deflection basin and through laboratory fatigue studies. The second method involves the application of a vibratory load to the pavement surface and determination of pavement response through deflection of the surface under a low-frequency vibration or by measurement of wave propagation at higher frequencies. The deflection of the pavement under the vibratory loading is used to determine dynamic stiffness, or type of spring constant, for the pavement structure. The wave velocity is used to arrive at a shear modulus and compression modulus of each pavement layer and the subgrade as well as thickness of each layer. Theoretical calculations involved and typical results are presented. Conclusions are made from findings in the literature, and recommendations are given for developing a method of nondestructive evaluation of flexible pavements. (Author).

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 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 Nondestructive Testing of Pavements written by A. A. Maxwell and published by . This book was released on 1960 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Use of Nondestructive Testing in the Design of Overlays for Flexible Pavements written by Robert L. Lytton and published by . This book was released on 1985 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Use of Non Destructive Testing in Flexible Pavement written by Hans Jørgen Ertman Larsen and published by . This book was released on 1983 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Application of Nondestructive Testing to Pavement Evaluation and Overlay Design written by Cheryl Allen Richter and published by . This book was released on 1987 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nondestructive Testing to Identify Delaminations between HMA Layers written by National Academies of Sciences, Engineering, and Medicine and published by Transportation Research Board. This book was released on 2022 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report from the second Strategic Highway Research Program (SHRP 2), which is administered by the Transportation Research Board of the National Academies, describes development of nondestructive testing techniques that are capable of detecting and quantifying delaminations in HMA pavements. This NDT technique is applicable to construction, project design, and network-level assessments. This e-book contains 5 different volumes, the last 4 involving more technical descriptions of the project.

Download or read book Noncontact Nondestructive Evaluation of Flexible Pavements Using Prototype Loads written by Norman T. Ng-A-Qui and published by . This book was released on 1977 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nondestructive Testing of Flexible Pavements written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NDT Technology for Quality Assurance of HMA Pavement Construction written by Harold L. Von Quintus and published by Transportation Research Board. This book was released on 2009 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: National Cooperative Highway Research Program

Download or read book Non destructive Testing written by and published by . This book was released on 1988 with total page 24 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 Non Destructive Techniques for the Evaluation of Structures and Infrastructure written by Belén Riveiro and published by CRC Press. This book was released on 2016-04-04 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an overview and up-to-date synthesis of the most commonly used non-destructive technologies for the reverse engineering of built infrastructure facilities. These technologies tackle both the geometric and radiometric characterization of built structures, and thus, validated technologies such as laser scanning, photogrammetry, and

Download or read book Nondestructive Testing of Flexible Pavements Field Testing Program Summary written by Mario S. Hoffman and published by . This book was released on 1981 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book AASHTO Guide for Design of Pavement Structures 1993 written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 1993 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.