Evaluation Of Seismic Pavement Analyzer For Pavement Condition Monitoring
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| Author | : Nenad Gucunski |
| Publisher | : |
| Total Pages | : 122 |
| Release | : 2002 |
| Genre | : Nondestructive testing |
| ISBN | : |
The Seismic Pavement Analyzer (SPA) is a device for nondestructive evaluation of pavements. This study examines the applicability of the SPA in pavement structural evaluation, detection of defects and distresses, and other uses relevant for pavement evaluation and condition monitoring. With respect to the equipment itself, the objectives were to examine the robustness and consistency of the SPA hardware and software, and the soundness of the seismic methods implemented in the device. A number of flexible and rigid pavements in New Jersey were tested, with specific attention given to pavement profiling and detection of voids or loss of support under rigid pavements.
| Author | : D. Yuan |
| Publisher | : |
| Total Pages | : 16 |
| Release | : 2000 |
| Genre | : Body waves |
| ISBN | : |
Seismic nondestructive testing technology has been incorporated in two newly developed devices: the seismic pavement analyzer (SPA) and its hand-portable version (PSPA). Shortly after a prototype of the SPA was built and tested under a SHRP contract, the Texas Department of Transportation (TxDOT) acquired a second prototype SPA and several PSPAs. Each of the two devices can rapidly carry out a suite of seismic tests to evaluate pavement condition. A few short-term projects were conducted to learn when and where the use of seismic technology is feasible. The usefulness of the test methods involved in SPA and PSPA has been to some extent evaluated. In their present states, the SPA and PSPA seem to be emerging as valuable tools for forensic studies and the day-to-day operation of TxDOT. The devices have been helpful in understanding some of the complex mechanisms encountered under accelerated pavement testing with the Texas Mobile Load Simulator and have provided useful information to the engineers in a few TxDOT projects. More experience is needed to fully understand the potential and the weaknesses of the devices, and further development of their software is required.
| Author | : Soheil Nazarian |
| Publisher | : Strategic Highway Research Program (Shrp) |
| Total Pages | : 165 |
| Release | : 1993 |
| Genre | : Nondestructive testing |
| ISBN | : 9780309057530 |
The Seismic Pavement Analyzer (SPA) is an instrument designed and constructed to monitor conditions associated with pavement deterioration. It measures voids or loss of support under a rigid pavement, moisture infiltration in asphalt concrete pavement, fine cracking in pavements delamination of overlays, and aging of asphalt. is report describes the device and summarizes the usefulness of the equipment in maintenance activities. The operation of the SPA to determine different types of distress precursors is briefly illustrated. This report discusses results from several field tests. The specifications and design of different components of the device and a manual of operation are presented in a companion report.
| Author | : D. Huston |
| Publisher | : CRC Press |
| Total Pages | : 664 |
| Release | : 2010-09-21 |
| Genre | : Science |
| ISBN | : 1420012355 |
Structural health monitoring (SHM) uses one or more in situ sensing systems placed in or around a structure, providing real-time evaluation of its performance and ultimately preventing structural failure. Although most commonly used in civil engineering, such as in roads, bridges, and dams, SHM is now finding applications in other engineering envir
| Author | : Mark Richard Baker |
| Publisher | : Strategic Highway Research Program (Shrp) |
| Total Pages | : 76 |
| Release | : 1993 |
| Genre | : Technology & Engineering |
| ISBN | : |
This report describes an instrument for monitoring conditions associated with pavement deterioration that was designed and constructed as part of the Strategic Highway Research Program. The conditions measured are voids or loss of support under a rigid pavement; moisture infiltrating asphalt concrete pavement; fine cracking in pavements; delamination of overlays; and aging of asphalt. These conditions of deterioration are determined by estimating Young's and shear moduli in the pavement, base, and subgrade from the wave propagation measurements. The details of the instrument are described. This report includes a user's manual along with the technical specifications for the device.
| Author | : K. Tawfiq |
| Publisher | : |
| Total Pages | : 19 |
| Release | : 2000 |
| Genre | : Extreme value theory |
| ISBN | : |
The purpose of using nondestructive testing techniques (NDT) for pavement evaluation is to obtain material properties at relatively low strain levels. Backcalculation methods that utilize surface deformation such as falling weight deflectometer (FWD) and Dynaflect assume linear elastic modeling for the pavement layers. Although the same assumption was considered for the seismic pavement analyzer (SPA) method, results obtained from these testing techniques did not conform to each other. To narrow the gap between the obtained pavement moduli values, a total of 22 pavement sites have been tested in Florida using deflection and seismic methods. Using the time-history records as well as the frequency response functions, pavement deformations from deflection and seismic methods were measured and related to the obtained moduli values. Relationships between deformation vs. pavement stiffness are presented. These relationships can be used to extract moduli values at any level of pavement deflection.
| Author | : Sreenivas Alampalli |
| Publisher | : CRC Press |
| Total Pages | : 458 |
| Release | : 2000-02-29 |
| Genre | : Technology & Engineering |
| ISBN | : 9781566769495 |
The fourth Structural Materials Technology NDT Conference was held in Atlantic City, New Jersey, with over sixty speakers presenting on a wide variety of topics. The goal of this conference was to inform engineers and researchers of the new nondestructive testing/nondestructive evaluation (NDT/NDE) technologies and techniques available for use in transportation construction. The use of alternative materials is challenging NDT/NDE professionals to develop new methods or modify existing techniques to address quality control, quality assurance, and long-term monitoring of structures built or strengthened with these materials. One such alternative is fiber-reinforced polymer (FRP) products. This conference included papers on this topic and a panel discussion that focused on the future of NDT/NDE technologies for structures built or rehabilitated with FRP composites. These proceedings contain the 62 papers that were presented at the conference, arranged according to session number. An author index is included.
| Author | : Shiraz D. Tayabji |
| Publisher | : ASTM International |
| Total Pages | : 534 |
| Release | : 2000 |
| Genre | : Materials |
| ISBN | : 0803128584 |
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
| Author | : Soheil Nazarian |
| Publisher | : |
| Total Pages | : 3 |
| Release | : 1995 |
| Genre | : Nondestructive testing |
| ISBN | : |
| Author | : Nenad Gucunski |
| Publisher | : |
| Total Pages | : 76 |
| Release | : 2000 |
| Genre | : Bridges |
| ISBN | : |
