Author: Catherine Johnson
Publisher:
ISBN:
Category :
Languages : en
Pages : 230
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Book Description
This thesis presents the recommendation for whether the Georgia Department of Transportation (GDOT) should adopt the National Cooperative Highway Research Program (NCHRP) Report 747 (Guide for Conducting Forensic Investigations of Highway Pavements) as a guide to conduct forensic investigations. The evaluation of three pavement types using the NCHRP 747 guide is completed: Jointed Plain Concrete (JPC), Continuously Reinforced Concrete (CRC), and Hot Mix Asphalt (HMA). Each type consisted of an evaluation of two sites in "good/fair" and "poor" conditions. Non-destructive testing was performed using a Ground Penetration Radar (GPR) and Falling Weight Deflectometer (FWD). Destructive and on-site field testing were performed consistently with the recommendations of the guide. Laboratory tests were conducted to determine material properties and combined with traffic data to form conclusions about the causes of pavement distress. It is recommended from this study that the GDOT adopts the NCHRP Report 747 for use in Georgia.
Author: Gonzalo R. Rada
Publisher: Transportation Research Board
ISBN: 0309283450
Category : Pavements
Languages : en
Pages : 162
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Book Description
"TRB's National Cooperative Highway Research Program Report 747: Guide for Conducting Forensic Investigations of Highway Pavements explores a process for conducting forensic investigations of pavements that is designed to help understand the reasons behind premature failures or exceptionally good performance. The process also allows for the collection of data for use in developing or calibrating performance-prediction models. The report includes example forms and checklists for use during the conduct of an investigation. These forms can be modified to suit the particular requirements and procedures for the agency. The example forms are included with the print version of the report in CD-ROM format." --Publisher description.
Author: Thomas Elliott Freeman
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 15
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Book Description
A few years after Old Airport Road in Bristol, Virginia, was reconstructed, inordinate distortions of remarkable uniformity began to appear in the paved asphalt surface directly above concrete pipe culverts, which were buried beneath and across the road to transport storm runoff. The distortions closely resemble broad speed bumps that extend across all lanes. The growing influence of the distortions on ride quality and subsequent complaints from the traveling public prompted the City of Bristol to request the investigation reported here. A summary of the project's construction background, methods and findings of the investigation, conclusions regarding the cause of distress, and recommendations for remedial action are presented. The portion of Old Airport Road afflicted by the distress is five lanes wide and extends approximately 0.80 mile in length from its intersection with Bonham Road to I-81 toward the north. Of the 20 pipe culverts that were constructed transversely beneath the road, 14 exhibited some sign of surface distortion at the time of this report. The culverts were placed as part of the Old Airport Road widening and reconstruction project in 1994. This forensic investigation, which included visual and video surveys of pavements and culverts, a geotechnical examination of subgrade conditions, a non-destructive pavement deflection analysis, laboratory and microscopic analyses of culvert trench backfill material, and review of a pertinent geotechnical exploration conducted by others, was designed to determine if the distress was the result of (1) settlement between culverts, or (2) heaving of the trenches themselves. Results of this work demonstrate that the cause of the observed distortions is attributed to expansive heave of the black pyritic shale that was used to backfill transverse culvert trenches. In addition, significant structural damage to culvert pipes resulting from excessive heave expansion pressures was documented. The laboratory analysis of shale backfill samples indicates that heave, which results from the oxidation of pyrite and the formation of new minerals, is ongoing. Recommendations for remedial action include removing all shale trench backfill in distorted zones, replacing damaged pipes, and properly backfilling with a flowable fill or a suitable, compactable non-shale granular material.
Author:
Publisher: Strategic Highway Research Program (Shrp)
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 164
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Book Description
Author: Sonny Kim
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages :
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Book Description
Author: Shad M. Sargand
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages :
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Book Description
The purpose of this research was to identify flexible and rigid pavements in Ohio with average and above average performance, and determine the reasons for these differences in performance. The identification and implementation of factors linked to extended service life will improve performance statewide. FWD and ride quality profiles were measured to evaluate project uniformity, and material samples were obtained from a selected location on each project and tested in the laboratory to determine material properties. Volume 1 of the report includes: the project selection process, FWD and ride quality data, laboratory results of testing on base, subgrade and asphalt concrete pavement samples, and projected service lives using FWD data and the MEPDG. Volume 2 provides results of the laboratory tests and petrographic examinations of the Portland cement concrete cores. Volume 3 contains petrographic analysis of PCC pavement specimens in Cuyahoga County, Ohio containing Blast Furnace Slag Aggregate. Flexible and rigid pavements in Ohio having no structural maintenance show an average condition rating of 68 after 20 and 30 years of service, respectively. This performance, coupled with the general lack of structural distress observed on pavements selected for study indicates pavement design procedures used in Ohio are meeting expectations. Practices recommended to improve pavement performance include: 1) constructing stiffer and more uniform subgrades to provide better support and minimize localized failures, 2) reducing amounts of Portland cement and using larger aggregate in 451 and 452 concrete, while continuing to screen aggregate for D-cracking susceptibility, 3) increasing emphasis on ensuring that dowel bars maintain proper alignment during PC concrete placement, and 4) continuing the use of performance grading, smaller aggregate and polymers in AC mixes on heavily traveled pavements. Other observations regarding data used to reach these conclusions include: keeping the PMIS database current, retaining construction records for at least the design life of the pavements, being aware that the effect of surface cracks on flexible pavement performance depends upon whether the cracks are top-down or bottom-up, and keeping the PMIS and straight-line diagrams consistent in identifying project limits, project numbers and paving materials.
Author: Gerardo W. Flintsch
Publisher: Transportation Research Board
ISBN: 0309142474
Category : Technology & Engineering
Languages : en
Pages : 154
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Book Description
Author: American Association of State Highway and Transportation Officials
Publisher: AASHTO
ISBN: 1560510552
Category : Pavements
Languages : en
Pages : 622
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Book Description
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.
Author: David Robert Luhr
Publisher:
ISBN: 9780893122478
Category : Pavements, Asphalt
Languages : en
Pages : 15
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Book Description
Full-depth reclamation (FDR) is a roadway rehabilitation process that recycles the materials from deteriorated asphalt pavement, and, with the addition of portland cement, creates a new stabilized base. This guide to FDR discusses its applications, benefits, design, construction, and testing.
Author: American Society of Civil Engineers
Publisher: Amer Society of Civil Engineers
ISBN: 9780784411049
Category : Technology & Engineering
Languages : en
Pages : 592
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Book Description
Pavement Design And Paving Material Selection are important for efficient, cost effective, durable, and safe transportation infrastructure Paving Materials and Pavement Analysis contains 73 papers examining bound and unbound material characterization, modeling, and performance of highway and airfield pavements. The papers in this publication were presented during the GeoShanghal 2010 International Conference held in Shanghai, China, June 3-5, 2010.
