Simplified Techniques for Evaluation and Interpretation of Pavement Deflections for Network-level Analysis PDF Download

Author: Régis Luis Carvalho
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 184

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Author:
Publisher:
ISBN:
Category : Dynaflect
Languages : en
Pages : 164

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Book Description
This report documents the research performed on evaluation of pavement deflection equipment under Contract DTFH61-85-C-00115 for the Federal Highway Administration. The following devices were included in side-by-side field tests conducted in the Austin, Texas area during the week of August 11, 1986: the Benkelman Beam, C.E.B.T.P. Curviameter, Dynaflect, Dynatest Falling Weight Deflectometer (FWD), Kuab FWD, Phonix FWD, and the Road Rater. The report includes descriptions and comparisons of the devices through information obtained from a literature search, field tests and user survey conducted for this study. The side-by-side test program was performed over a broad range of pavement structures, including thick and thin flexible and rigid pavements, and composite pavements. The measured deflections were compared statistically. Mechanistic interpretations of the measured deflection basins were made and compared.

Author: Erland O. Lukanen
Publisher:
ISBN:
Category :
Languages : en
Pages : 52

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Author: R. Clark Graves
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 196

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In this study a procedure has been developed to evaluate the structural condition of pavements using Road Rater deflection measurements. These procedures compare actual field deflections with deflections calculated by the Chevron N-Layer linear elastic computer program. The results obtained from these procedures are the layer moduli of the pavement materials. Procedures have been developed for asphaltic concrete pavements and composite pavements, including broken and non-broken concrete layers. This report also contains a comparison of structural overlay determined using the results of the new procedure, with overlays calculated using results from the 2-3 Projected procedure currently used by the Pavement Management branch of the Kentucky Transportation Cabinet. A users manual from the computer programs developed during this study is included in the appendix of the report.

Author:
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 40

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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).

Author: M. Hossain
Publisher:
ISBN:
Category : Asphalt pavement
Languages : en
Pages : 8

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Book Description
Structural evaluation provides valuable information about the expected behavior of pavements and can be very useful at the network level of pavement management for project prioritization purposes. However, due to the expense involved in data collection and analysis, structural capacity is usually not determined at the network level. In Kansas, due to limited resources and the large size of the network (10 971 miles), annual network-level structural data collection at the same rate (five to ten tests per mile) as the project level is not realistic. This study was initiated to determine the sample size (% mileage) at the network level as well as the test intervals and frequency that can be used as guides for network-level deflection testing and structural evaluation of pavements.

Author: Mario S. Hoffman
Publisher:
ISBN:
Category : Nondestructive testing
Languages : en
Pages : 270

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Author: R. J. Wedner
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 126

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Book Description
Project monitored flexible pavement dynamic deflections, roughness, and distress over a six-year period. Results show present surface condition and serve as a basis for evaluating rehabilitation needs.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Daba S. Gedafa
Publisher:
ISBN:
Category : Pavement temperature
Languages : en
Pages : 10

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Book Description
Structural evaluation can be very useful at the network level of pavement management for project prioritization purposes. However, due to expenses involved in data collection and analysis, pavements are not tested for structural capacity at the network level. Rolling wheel deflectometer (RWD), which measures surface deflections at highway speed, is an alternate, faster method of pavement deflection testing for network level data collection. This study was initiated to assess the feasibility of using RWD for network level pavement deflection measurements. RWD deflection data was collected under an 80-kN axle load and at about highway speed on non-interstate highways in northeast Kansas in July 2006. Falling-wheel deflectometer (FWD) data on these roads, collected from 1998 to 2006, were also used for comparison. The computed effective structural numbers from both FWD and RWD deflection data were compared. The results show that the deflections measured by RWD and the center (first sensor) deflections from FWD are statistically similar. The effective structural numbers computed from the FWD and RWD deflection measurements are also statistically similar. Thus RWD appears to be a valuable tool for structural capacity evaluation of pavements at the network level.