Backcalculation of Dynamic Modulus from Falling Weight Deflectometer Data PDF Download

Author: Y. Richard Kim
Publisher:
ISBN:
Category : Pavements, Asphalt concrete
Languages : en
Pages : 68

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Author: Albert Jasper Bush
Publisher: ASTM International
ISBN: 0803112602
Category : Kaldırımlar-Deneme
Languages : en
Pages : 701

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Book Description

Author: ASTM Committee D-18 on Soil and Rock. Subcommittee D-4 on Road and Paving Materials
Publisher: ASTM International
ISBN: 0803118651
Category : Fatigue
Languages : en
Pages : 528

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Book Description
The proceedings of June 1993 international symposium held in Atlanta, Georgia, called specifically to develop and standardized evaluation procedures for non-destructive methods of testing pavements. The 29 papers discuss analytical models and techniques, measurement and calculation techniques in the field and laboratory, problems and errors associated with backcalculation methods and design parameters, and testing for other pavement uses. Also includes a history of the quest for a standard and the status of that effort. Reproduced from typescripts. Annotation copyright by Book News, Inc., Portland, OR

Author: H. Yokota
Publisher:
ISBN:
Category : Backcalculation
Languages : en
Pages : 14

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Book Description
A study on dynamic backcalculation and overlay design based on falling weight deflectometer (FWD) data is presented. Dynamic slab-ground theory (DSGT) was used for dynamic backcalculation of a pavement structure. A computer program based on DSGT generated theoretical dynamic deflections of the pavement. For the backcalculation of equivalent full-depth asphalt concrete (AC) thickness and subgrade modulus, these deflections were matched with FWD deflections from major roads in Miyazaki Prefecture, Japan. Temperature influence on Young's modulus of AC was also considered. Results were then compared with those from DSGT's static analysis version (SSGT) and also from a Japanese representative method, NIPPO, which is a static elastic multilayer method. Characteristics of dynamic backcalculation analysis are discussed. The range of pavement variables showing necessity for dynamic analysis was also considered by comparison of theoretical deflections using DSGT and SSGT. Furthermore, overlay thickness design using Kentucky Transportation Center's procedure was carried out.

Author: Shiraz D. Tayabji
Publisher: ASTM International
ISBN: 0803128584
Category : Materials
Languages : en
Pages : 534

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Book Description
As with the previous two symposia, the 32 papers from the June/July, 1999, Seattle symposium present advances in the nondestructive testing of pavements using conventional falling weight deflectometer techniques and other promising techniques such as ground penetrating radar, rolling weight deflecto

Author: Kasthurirangan Gopalakrishnan
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 65

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Book Description
The asphalt concrete (AC) dynamic modulus (\E*\) is a key design parameter in mechanistic-based pavement design methodologies such as the American Association of State Highway and Transportation Officials (AASHTO) MEPDG/Pavement-ME Design. The objective of this feasibility study was to develop frameworks for predicting the AC \E*\ master curve from falling weight deflectometer (FWD) deflection-time history data collected by the Iowa Department of Transportation (Iowa DOT). A neural networks (NN) methodology was developed based on a synthetically generated viscoelastic forward solutions database to predict AC relaxation modulus (E(t)) master curve coefficients from FWD deflection-time history data. According to the theory of viscoelasticity, if AC relaxation modulus, E(t), is known, \E*\ can be calculated (and vice versa) through numerical inter-conversion procedures. Several case studies focusing on full-depth AC pavements were conducted to isolate potential backcalculation issues that are only related to the modulus master curve of the AC layer. For the proof-of-concept demonstration, a comprehensive full-depth AC analysis was carried out through 10,000 batch simulations using a viscoelastic forward analysis program. Anomalies were detected in the comprehensive raw synthetic database and were eliminated through imposition of certain constraints involving the sigmoid master curve coefficients. The surrogate forward modeling results showed that NNs are able to predict deflection-time histories from E(t) master curve coefficients and other layer properties very well. The NN inverse modeling results demonstrated the potential of NNs to backcalculate the E(t) master curve coefficients from single-drop FWD deflection-time history data, although the current prediction accuracies are not sufficient to recommend these models for practical implementation. Considering the complex nature of the problem investigated with many uncertainties involved, including the possible presence of dynamics during FWD testing (related to the presence and depth of stiff layer, inertial and wave propagation effects, etc.), the limitations of current FWD technology (integration errors, truncation issues, etc.), and the need for a rapid and simplified approach for routine implementation, future research recommendations have been provided making a strong case for an expanded research study.

Author: National Research Council (U.S.). Transportation Research Board
Publisher: Transportation Research Board National Research
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 148

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Book Description

Author: Y. Richard Kim
Publisher:
ISBN: 9780309446839
Category : Pavements, Asphalt
Languages : en
Pages : 104

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Book Description

Author: Y. Richard Kim
Publisher: CRC Press
ISBN: 1315736756
Category : Technology & Engineering
Languages : en
Pages : 1966

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Book Description
Asphalt Pavements contains the proceedings of the International Conference on Asphalt Pavements (Raleigh, North Carolina, USA, 1-5 June 2014), and discusses recent advances in theory and practice in asphalt materials and pavements. The contributions cover a wide range of topics:- Environmental protection and socio-economic impacts- Additives and mo

Author: Michael S. Mamlouk
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 184

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Book Description
GSP 98 contains 10 papers on pavement subgrade presented at sessions of Geo-Denver 2000, held in Denver, Colorado, August 5-8, 2000.