Development Of The Thickness Design For Concrete Pavement Overlays Over Existing Asphalt Pavement Structures
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Development Of The Thickness Design For Concrete Pavement Overlays Over Existing Asphalt Pavement Structures
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Author : Chul Suh
language : en
Publisher:
Release Date : 2008
Development Of The Thickness Design For Concrete Pavement Overlays Over Existing Asphalt Pavement Structures written by Chul Suh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Pavements categories.
Several thin whitetopping (TWT) projects in the U.S. were reviewed to identify variables with significant effects on TWT behavior and performance. The joint spacing has a significant effect on performance as it determines the wheel loading condition in the slabs. Joints placed under or near the wheel paths caused serious distresses in TWT due to corner loading condition. Full-scale whitetopping pavement was constructed and tested under static and constant cyclic loading for fatigue. The concept of equivalent fatigue life was applied to correct the effect of the different stress ratios. The S-N curve developed from this study was very close to Thompson and Barenburgs S-N curve after the application of the equivalent fatigue life concept. A factorial experiment was developed that included almost all the variables related to TWT designs. A total of 7,776 treatments were identified. Computer program ISLAB2000 was selected as an analysis tool, as it was used in the development of MEPDG. ISLAB2000 was run 7,776 times and the results were statistically analyzed. Using log-log regression, the analysis results were approximated with the generalized English unit design equation for the determination of the required whitetopping thickness with several conservative assumptions. Current TxDOT design method for TWT does not account for the condition of the existing hot mix asphalt pavement. Rather, the slab thickness is determined solely by the future truck traffic. In addition, current TxDOT design method for TWT requires truck traffic as input while TP & P provides traffic information in terms of ESALs. The proposed design equation is more realistic in that it accounts for all the design variables including layer characteristics. It also utilizes ESAL as traffic input. Therefore, the proposed design equation will provide TxDOT engineers with more accurate and convenient design tool for TWT.
Development Of Rational Overlay Design Procedures For Flexible Pavements
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Author : James A. Crovetti
language : en
Publisher:
Release Date : 2005
Development Of Rational Overlay Design Procedures For Flexible Pavements written by James A. Crovetti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Pavements categories.
Development Of The Thickness Design For Concrete Pavement Overlays Over Existing Asphalt Pavement Structures
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Author : Chul Suh
language : en
Publisher:
Release Date : 2008
Development Of The Thickness Design For Concrete Pavement Overlays Over Existing Asphalt Pavement Structures written by Chul Suh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Pavements categories.
Development Of An Overlay Design Procedure For Composite Pavements
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Author : Liangbo Hu
language : en
Publisher:
Release Date : 2017
Development Of An Overlay Design Procedure For Composite Pavements written by Liangbo Hu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Pavements categories.
The composite overlay design procedure currently used by ODOT sometimes produces very large overlay thicknesses that are deemed structurally unnecessary, especially for composite pavements already with thick asphalt overlays. This study was initiated to investigate the cause(s) and to develop a revised procedure. The current ODOT pavement overlay thickness design procedure is based on the structural deficiency approach recommended by the 1993 AASHTO Pavement Design Guide. The current procedure uses a simple, closed form procedure to back-calculate the subgrade modulus and the effective modulus of the existing pavement structure from the measured Falling Weight Deflectometer (FWD) surface deflections. The simplistic treatment of the AC and PCC layers as a combined layer in the back-calculation model was found to significantly underestimate the moduli of the existing pavement. A three-layer elastic model is adopted in lieu of the two-layer model used in the current procedure for back-calculation. The three-layer model allows the composite pavement structure to be modeled more accurately. The elastic moduli of the asphalt concrete layer and the underlying Portland cement concrete can both be back-calculated, instead of being combined as one. A revised overlay design procedure has been developed. A comparison of the revised procedure and the current procedure shows that the three-layer model produces higher effective thickness than the two-layer model for the same pavement structure. Therefore, the required overlay thickness is reduced. The revised design software has been implemented into a design software program, which also offers an optional feature that takes into consideration the temperature effects on the asphalt concrete moduli.
Using Existing Pavement In Place And Achieving Long Life
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Author : Newton Jackson, Jason Puccinelli, and Joe Mahoney
language : en
Publisher: Transportation Research Board
Release Date :
Using Existing Pavement In Place And Achieving Long Life written by Newton Jackson, Jason Puccinelli, and Joe Mahoney and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
This report from the second Strategic Highway Research Program (SHRP 2), which is administered by the Transportation Research Board of the National Academies, focuses on improving the ability of highway agencies to design and construct long-lasting highway projects with minimal disruption to the traveling public.
Asphalt Overlay Design Procedures
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Author : Fred N. Finn
language : en
Publisher: Transportation Research Board National Research
Release Date : 1984
Asphalt Overlay Design Procedures written by Fred N. Finn and has been published by Transportation Research Board National Research this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Technology & Engineering categories.
This synthesis will be of interest to pavement designers and others concerned with the design of asphalt concrete overlays. Information is presented on reasons for overlaying a pavement and on the vaious methods available for design of an asphalt overlay. A pavement overlay may be required because of inadequate ride quality, excessive pavement distress, reduced friction between tire and pavement, high user costs, or inadequate structural capacity for planned use. This report of the Transportation Research Boad discusses the current methods used for designing asphalt concrete overlays with emphasis on deflection-based and analytical procedures.
Pavement Overlay Design Procedures And Assumptions
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Author :
language : en
Publisher:
Release Date : 1986
Pavement Overlay Design Procedures And Assumptions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Pavements categories.
Pavement Overlay Design Procedures And Assumptions Analysis Of Existing Procedures
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Author :
language : en
Publisher:
Release Date : 1986
Pavement Overlay Design Procedures And Assumptions Analysis Of Existing Procedures written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Pavements categories.
Improving Design Strategies For Composite Pavement Overlay
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Author : Pawan Sigdel
language : en
Publisher:
Release Date : 2016
Improving Design Strategies For Composite Pavement Overlay written by Pawan Sigdel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Pavements categories.
Pavements need constant rehabilitation when they deteriorate with time and approach the end of their expected service lives. Overlay is the most prevalent treatment that restores its desirable condition and extends its life span of serviceability, especially for roads subjected to moderate and heavy traffic. Overlay composite design remains a major challenge due to difficulties in characterizing the complex behavior and assessing the existing condition of a combination of asphalt concrete (AC) and Portland cement concrete (PCC) layers over a soil subgrade. Deflection based design using falling weight deflectometer (FWD) deflection data offers an effective approach for overlay thickness design for composite pavements. It utilizes the deflection measurements of the pavement surface which can be used to back-calculate the subgrade and overlay composite properties and allows one to estimate the structural capacity of the existing pavement. However, the prevailing deflection based design procedure generally treats the AC and PCC as a single layer during the back-calculation and, as a result, frequently leads to less than satisfactory, usually over-conservative, design for overlay composites. The principal objective of this research is to develop improved FWD deflection based design strategies for overlay composite pavements. It is proposed that a three-layer linear elastic model be used for back-calculation of the moduli of all three layers: subgrade, PCC and AC. The structural capacity of the existing pavement is estimated using pavement surface deflections measured by FWD, the most commonly used pavement non-destructive testing (NDT) device. In the present study actual FWD deflection data for eleven construction projects are used to back-calculate the moduli of three layers. The three-layer model allows the composite pavement structure to be modeled more accurately. The elastic moduli of the asphalt concrete layer and the underlying Portland cement concrete can both be back-calculated, instead of combining them into one. The results show that the three-layer model produces higher effective thickness than the two-layer model for the same pavement structure, thereby reducing the required overlay thickness. However, there are a number of factors that can strongly influence the final overlay design thickness. The effects of computational error tolerances in back-calculation, temperature at FWD testing and variations in FWD deflection data are found significant and may cause unreliable design results and hence, two strategies to avoid excessively large or small back-calculated moduli are also explored: imposing moduli bounds and relaxing the precision convergence; they have been found very effective in mitigating the effect of large variations in deflection data. The statistical variations observed in the overlay design are also evaluated and two models are explored to improve the overall design procedure from the statistical perspective: Monte Carlo method and Point Estimation method. The effective thicknesses of existing pavement computed from reliability analysis are similar to those obtained from the proposed design method. This demonstrates the validity of the proposed design method and also the applicability of reliability based design in case the statistical parameters are available or can be obtained from engineering judgment.
Guide To Concrete Overlay Solutions
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Author :
language : en
Publisher:
Release Date : 2007
Guide To Concrete Overlay Solutions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Pavements categories.
This guide will help readers understand concrete overlays and develop confidence in their application. The guide provides the key elements of the six major types of concrete overlays along with specifics on materials, typical sections, and important construction elements.