Use of Falling Weight Deflectometer Multi-load Data for Pavement Strength Estimation

Use of Falling Weight Deflectometer Multi-load Data for Pavement Strength Estimation
Author: Y. Richard Kim
Publisher:
Total Pages: 208
Release: 2002
Genre: Pavements
ISBN:
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The objective of this study is to develop a mechanistic-empirical method for assessing pavement layer conditions and estimating the remaining life of flexible pavements using multi-load level Falling Weight Deflectometer (FWD) deflections. A dynamic finite element program, incorporating a stress-dependent soil model, was developed to generate the synthetic deflection database. Based on this synthetic database, the relationships between surface deflections and critical pavement responses, such as stresses and strains in each individual layer, have been established. A condition assessment procedure for asphalt pavements that uses multi-load level FWD deflections has been developed using these relationships. The verification study was conducted using field data.

Seasonal and Hourly Variation of Pavement Deflections Measured with the Falling Weight Deflectometer (FWD)

Seasonal and Hourly Variation of Pavement Deflections Measured with the Falling Weight Deflectometer (FWD)
Author: Mustaque Hossain
Publisher:
Total Pages: 192
Release: 1996
Genre: Pavements
ISBN:
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The objective of this research project was to evaluate and quantify the effect of seasonal variation in material properties on the deflections measured with the Falling Weight Deflectometer (FWD). The study was initiated to quantify the effects of moisture content of subgrade soil and pavement temperature on the structural response of the pavement. The data collected from October 1993 to September 1994 at each site included deflections using a Dynatest 8000 FWD, pavement surface and air temperatures while conducting FWD tests, monthly precipitation and average air temperature for five days preceding the FWD tests and moisture content in the subgrade using principles of time domain reflectometry (TDR).

Proceedings of the RILEM International Symposium on Bituminous Materials

Proceedings of the RILEM International Symposium on Bituminous Materials
Author: Hervé Di Benedetto
Publisher: Springer Nature
Total Pages: 1806
Release: 2021-09-25
Genre: Technology & Engineering
ISBN: 3030464555
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This volume highlights the latest advances, innovations, and applications in bituminous materials and structures and asphalt pavement technology, as presented by leading international researchers and engineers at the RILEM International Symposium on Bituminous Materials (ISBM), held in Lyon, France on December 14-16, 2020. The symposium represents a joint effort of three RILEM Technical Committees from Cluster F: 264-RAP “Asphalt Pavement Recycling”, 272-PIM “Phase and Interphase Behaviour of Bituminous Materials”, and 278-CHA “Crack-Healing of Asphalt Pavement Materials”. It covers a diverse range of topics concerning bituminous materials (bitumen, mastics, mixtures) and road, railway and airport pavement structures, including: recycling, phase and interphase behaviour, cracking and healing, modification and innovative materials, durability and environmental aspects, testing and modelling, multi-scale properties, surface characteristics, structure performance, modelling and design, non-destructive testing, back-analysis, and Life Cycle Assessment. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster new multidisciplinary collaborations.

Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields

Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields
Author: Inge Hoff
Publisher: CRC Press
Total Pages: 673
Release: 2022-07-07
Genre: Technology & Engineering
ISBN: 100073871X
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Innovations in Road, Railway and Airfield Bearing Capacity – Volume 3 comprises the third part of contributions to the 11th International Conference on Bearing Capacity of Roads, Railways and Airfields (2022). In anticipation of the event, it unveils state-of-the-art information and research on the latest policies, traffic loading measurements, in-situ measurements and condition surveys, functional testing, deflection measurement evaluation, structural performance prediction for pavements and tracks, new construction and rehabilitation design systems, frost affected areas, drainage and environmental effects, reinforcement, traditional and recycled materials, full scale testing and on case histories of road, railways and airfields. This edited work is intended for a global audience of road, railway and airfield engineers, researchers and consultants, as well as building and maintenance companies looking to further upgrade their practices in the field.

Interpretation of Fwd Data when Pavement Layers are Not Intact

Interpretation of Fwd Data when Pavement Layers are Not Intact
Author: Y. Richard Kim
Publisher:
Total Pages: 158
Release: 1999
Genre: Pavements
ISBN:
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When FWD tests are performed on broken or cracked pavements (of which information is crucial in making rehabilitation and overlay decisions), the multi-layered elastic theory-based backcalulation programs assume that the effect of these discontinuities in a cracked layer on deflection basins would be accounted for by the reduction of the elastic modulus for that layer. However, it has been concluded and confirmed by researchers and practitioners that the backcalculation algorithms based on the multi-layered elastic theory produce large variation in the algorithms based on the multi-layered elastic theory produce large variation in the 'effective' moduli of the cracked layers. Studies have also shown that significant errors in the backcalculated pavement moduli can accrue from performing a static analysis of what is inherently a dynamic test. Unfortunately, dynamic analysis usually involves complex calculations and requires significant computation time, thus making it impracticable for routine applications. This study presents a methology based on deflection basin parameters.