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Author: Arizona State University. Center for Advanced Research in Transportation
Publisher:
ISBN:
Category :
Languages : en
Pages : 161
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Author: Arizona State University. Center for Advanced Research in Transportation
Publisher:
ISBN:
Category :
Languages : en
Pages : 161
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Author:
Publisher:
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Category : Pavements
Languages : en
Pages : 256
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Book Description
In this study, a rational overlay design method for flexible pavements in Arizona has been developed which includes roughness, fatigue and plastic deformation models. The method is incorporated in a microcomputer program which is also capable of analyzing the economics of other rehabilitation alternatives. During the development of the method, twenty in-service pavement sites were selected from Arizona highways covering various geographical and environmental regions, soil types, pavement conditions and traffic volumes. nondestructive tests (NDT) were performed on these sites using the Falling Weight Deflectometer at three stress levels as well as the Dynaflect. The pavement layers and subgrade moduli were backcalculated from NDT data using both static and dynamic analyses. The moduli of asphaltic layers were further adjusted for temperature. Statistical analysis was performed and the stress sensitivity was found to be small. Cone Penetration tests were further performed to verify the subgrade moduli. Asphalt concrete cores, base and subbase samples and undisturbed subgrade materials. In addition, base and subbase gradation as well as soil classification and Atterberg limits were obtained. The study expanded the data base for material properties in Arizona. This volume is the first in a three volume set. Volume II provides field testing procedure and workstation development and Volume III is a computer user guide.
Author: Animesh Das
Publisher: CRC Press
ISBN: 1466558563
Category : Technology & Engineering
Languages : en
Pages : 222
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Predict or Explain the Pavement Response to Load: Understand the Physical Governing PrinciplesAnalysis of Pavement Structures brings together current research and existing knowledge on the analysis and design of pavements. This book provides a platform for the readers to understand the basic principles of physics and mechanics involved in pavement
Author:
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 216
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Author:
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Category : Highway engineering
Languages : en
Pages : 424
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Author:
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Category : Science
Languages : en
Pages : 888
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Author: Kurt D. Smith
Publisher:
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Category : Falling weight deflectometer
Languages : en
Pages : 14
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The need to accurately characterize the structural condition of existing pavements has increased with the recent development, release, and ongoing implementation of the Mechanistic-Empirical Pavement Design Guide (MEPDG), developed under National Cooperative Highway Research Program Project No. 1-37A. A number of different material inputs are required in the procedure, and it is important that these be adequately characterized and defined so that competent structural designs can be developed. The analysis of deflection data collected with a falling weight deflectometer (FWD) provides a quick and reliable way of characterizing many of the parameters of the existing pavement layers. This paper summarizes how deflection data are incorporated into the MEPDG and describes two case studies, one with a flexible pavement and one with a rigid pavement. Significant findings and recommendations from the evaluated flexible pavement case study include the following: surface-down cracking is critical in the design of the hot mix asphalt (HMA) overlay, correction factors should be used for adjusting backcalculated layer moduli to laboratory determined values, and an FWD testing frequency of 30 Hz should be used for estimating the existing HMA modulus. For rigid pavements, the case study found that the thinnest overlay produced from the MEPDG was a bonded Portland cement concrete (PCC) overlay, whereas the HMA overlay was unreasonably thick. Within the design procedure, the manually entered k-value is used for unbonded and bonded jointed plain concrete pavements but does not appear to be used by the program in the HMA overlay design. The backcalculated dynamic (or static) elastic modulus should be used for the PCC layer, and the dynamic k-value should be used for the supporting layers. The backcalculated k-value representing the composite stiffness of all layers beneath the slab does not appear to have a significant influence on the design thickness for the pavement structure analyzed.
Author:
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Category : Public administration
Languages : en
Pages : 540
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Author:
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Category : Air travel
Languages : en
Pages : 698
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Author: Régis Luis Carvalho
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 184
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