Performance of Virginia's CBR Designed Pavements PDF Download
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Author: Frank Patterson Nichols
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 18
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Book Description
Author: Frank Patterson Nichols
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 18
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Book Description
Author: National Research Council (U.S.). Highway Research Board
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 236
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Book Description
Author: Nari K. Vaswani
Publisher:
ISBN:
Category : Pavements, Flexible
Languages : en
Pages : 24
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Book Description
Author: Nari K. Vaswani
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages :
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Author: Kenneth H. McGhee
Publisher:
ISBN:
Category : Interstate Highway System
Languages : en
Pages : 77
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Book Description
Extensive studies of over 800 miles of divided interstate pavements constructed prior to July 1, 1975, are reported. The studies included those of performance adequacy and the identification of certain factors which appeared to adversely affect performance. The studies showed that Virginia interstate pavements have performed very well in spite of some serious problems for which the causes have been identified and corrected in current standards and specifications. Six instances where location, pavement age, and traffic permitted valid comparisons between portland cement and bituminous concrete pavements showed the two pavement types to be performing similarly and to have incurred very similar maintenance costs. Ten recommendations relating to design, construction, and maintenance are presented. A major recommendation encourages the Department to continue to consider all the existing pavement types with appropriate modifications, for use on future construction. No major design modifications are recommended.
Author: Virginia. Department of Highways. Division of Tests
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 24
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Author: Charles S. Hughes
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 37
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Book Description
Author: Kenneth H. McGhee
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 17
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Book Description
The performance of in-service typical Virginia flexible and rigid pavements in all areas of the state has been under evaluation since 1954. The objectives are to provide a ready reference for designers and field engineers and to provide background information for design improvement. Periodic deflection and roughness tests have been conducted along with field inspections. The records maintained on each pavement reflect condition, traffic, construction costs, and major repairs. Among the major findings of the study are: 1. Cement stabilized subgrades under recently constructed flexible pavements have virtually eliminated rutting and other major distortions; 2. the estimated cumulative number of 18 kip equivalent axle loads sustained by a pavement up to a fixed degree of cracking is directly related to a parameter used to define the shape of the dynaflect deflection basin; 3. terminal PSI as defined from the AASHO Road Test is too insensitive for use in the evaluation of flexible pavement performance in Virginia; 4. and the use of too long a joint spacing and of metal joint forming inserts has impaired the performance of rigid pavements in Virginia.
Author: National Research Council (U.S.). Highway Research Board
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 84
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Author:
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 33
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Book Description
This study evaluated 18 pavement sections located in high-traffic highways in Virginia to find a premium pavement design with a life span of 40 years or more using current and past field experience. The selected pavement sections were thought to perform well. Eight flexible pavements, six composite pavements, two continuously reinforced concrete pavements, and two jointed plain concrete pavements were investigated. Field testing consisted of (1) falling weight deflectometer (FWD) testing to assess the structural capacity of the different pavements and to backcalculate the pavement layer materials' moduli, (2) ground-penetrating radar (GPR) scanning to determine layer thicknesses and to locate any abnormalities inside the pavements, (3) digital imaging to determine condition indices, (4) longitudinal profile measurements to calculate International Roughness Index, and (5) coring and boring to perform material characterization of pavement layers. Hot mix asphalt tests included resilient modulus and creep compliance. Concrete was tested for compressive strength. The analysis of the collected data suggests that premium pavement designs can be obtained. The field investigations suggest that all the tested sites are performing satisfactorily and show very low structural distress. Limited material-related problems were found at some sites, which induced non-load related distresses. It was also confirmed that FWD, GPR, and digital imaging are very useful tools to assess the condition of existing pavements. Since the three categories of pavements (flexible, composite, and rigid) were found to perform well, the study recommends that evaluation of other pavement sections, which are thought to perform in a less than optimal state, be conducted to define the causes of the less than desired performance. The selection of the most appropriate premium pavement design should be based on a detailed life-cycle cost analysis; hence, such analysis should be performed. Mechanistic empirical modeling of the best performing section within each category would allow the prediction of future pavement performance for use in the life-cycle cost analysis.
