Predicting Seasonal Changes in Pavement Stiffness and Capacity Caused by Freezing and Thawing PDF Download
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Author: Craig H. Benson
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 0
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Book Description
Author: Craig H. Benson
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 0
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Book Description
Author: Craig H. Benson
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 76
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Book Description
The objective of this study was to develop a method to predict the timing of weight limits on secondary highways in Wisconsin. Two types of weight limits are of interest: overloads when the pavement is frozen and weight restrictions during thawing and post-thawing recovery period. To meet this objective, three sections of secondary highways with flexible pavements were instrumented and monitored to determine how freezing, thawing, and post-thaw recovery affect pavement stiffness. Data collected from these sites were used to develop a computer model (UWFrost) that can be used to predict seasonal changes in the support capacity of pavements.
Author: Craig H. Benson
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 61
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Book Description
The objective of this study was to develop a method to predict the timing of weight limits on secondary highways in Wisconsin. Two types of weight limits are of interest: overloads when the pavement is frozen and weight restrictions during thawing and post-thawing recovery period. To meet this objective, three sections of secondary highways with flexible pavements were instrumented and monitored to determine how freezing, thawing, and post-thaw recovery affect pavement stiffness. Data collected from these sites were used to develop a computer model (UWFrost) that can be used to predict seasonal changes in the support capacity of pavements.
Author: W. Allen Marr
Publisher: ASTM International
ISBN: 0803124937
Category : Automatic test equipment
Languages : en
Pages : 326
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Book Description
Author: David E. Newcomb
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 790
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Book Description
This collection contains more than 70 papers presented at the Ninth International Conference on Cold Regions Engineering, held in Duluth, Minnesota, September 27-30, 1998.
Author: Erik Simonsen
Publisher:
ISBN: 9789929658332
Category : Frost
Languages : en
Pages :
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Book Description
This doctoral thesis focuses on thaw weakening of pavement structures. The thesis consists of a literature review (Paper I), modeling and field verification of an evaluation procedure for pavements exposed to seasonal frost conditions (Papers II and III), and experimental studies on the resilient properties of unbound road materials during freezing and thawing (Papers IV and V).The literature review describes factors identified as significant for the extent of weakening during soil thawing, e.g. soil type, permeability, drainage conditions and rate of thaw. Also the rate of freezing may indirectly affect thaw weakening. Persisting structural changes in soil fabric are also frequently observed. Findings concerned with frost action effects on a number of test roads are presented. The effects of frost action on resilient behavior are also described. In conclusion, attempts to develop semi-mechanistic pavement design and evaluation procedures for pavements in cold regions are presented. Although the effects of climate on pavement structures are recognized as a major contributor to the deterioration of pavement structures in cold regions, only a few models concerned with both frost heave and thaw settlement have been developed. In Paper II, a coupled mass and heat transfer model is tested and evaluated with respect to parameters critical to thaw weakening. The results indicate that soil temperature is predicted very well and soil moisture relatively well during freezing and thawing. Paper III presents an initial attempt to implement a commercially available finite element program in an evaluation procedure for pavements in seasonal frost areas. The results are compared with data from an extensively instrumented test road and indicate that surface deflection and relative change in pavement stiffness are predicted very accurately. Although a time lag between maximum measured and predicted surface deflection is observed during thawing, the procedure is found to be promising. The results from extensive resilient modulus laboratory tests during freezing and thawing are presented in Paper IV. The results indicate that all the soils exhibited substantially decreased resilient modulus after freeze-thaw. The decrease is ascribed to an observed increase in volume, and consequently a looser soil structure, due to freeze-thaw. A significant hysteresis for the clay soil in warming and cooling was also observed. Variable confining pressure (VCP) triaxial tests are generally preferred to constant confining pressure (CCP) tests, due to the more realistic stress application. However, VCP tests have never been utilized for investigation of freeze-thaw effects on unbound road materials. Paper V reports results obtained utilizing CCP and VCP triaxial tests for the characterization of resilient soil behavior during freezing and thawing. The results indicate a significant difference in moduli computed from CCP and VCP data. However, resilient moduli display compatible values if interpreted in terms of mean values of deviator stress and mean normal stress. With regard to freeze-thaw effects on resilient moduli, the results are inconsistent with previous findings. However, this can be explained by the different test conditions applied. (Abstract shortened by UMI.)
Author:
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Category :
Languages : en
Pages :
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Book Description
Seasonal variation of temperature and moisture cause considerable changes in the load-carrying capacity of pavements in geographical areas subject to extreme freeze/thaw conditions. Pavement engineers in these areas must be able to quantify the variation in the load-carrying capacity of a pavement in order to design it adequately. The Seasonal Monitoring Program (SMP) of the Long Term Pavement Performance (LTPP) study of the U.S.A. Federal Highway Administration (FHWA) is monitoring seasonal variations in Falling Weight Deflectometer (FWD) deflections, air temperature, rainfall, soil temperature, moisture content, and soil electrical resistance at numerous sites across North America. The present study relates changes in pavement load carrying capacity represented by the pavement layer resilient moduli to selected environmental factors on the SMP site near Oak Lake, Manitoba. The most significant environmental parameters causing seasonal variation in pavement layer resilient moduli are identified as surface temperature (asphalt layer) and Thawing Index (base and subgrade layers). The examination of the material properties of this single pavement site during any time of the year is an important first step towards the adoption of mechanistic pavement design and rehabilitation procedures at the Manitoba Department of Highways and Transportation. For the covering abstract of this conference see IRRD number 872978.
Author:
Publisher:
ISBN:
Category : Air travel
Languages : en
Pages : 692
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Book Description
Author:
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 116
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Author: Andrew Dawson
Publisher: Springer Science & Business Media
ISBN: 1402085621
Category : Science
Languages : en
Pages : 454
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Book Description
Only book world-wide addressing this topic. The principal output of the European co-operative Action on "Water Movements in Road Pavements & Embankments". Provides unique guidance on assessing water condition and its affects on road performance. Provides unique guidance on assessing and ameliorating contaminant movement in pavement groundwater. Written by leading experts in Europe.
