Evaluation Of Volumetric And Mechanistic Properties Of Asphalt Mixtures
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Evaluation Of Volumetric And Mechanistic Properties Of Asphalt Mixtures
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Author : Samuel B. Cooper
language : en
Publisher:
Release Date : 2011
Evaluation Of Volumetric And Mechanistic Properties Of Asphalt Mixtures written by Samuel B. Cooper and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Comparing The Volumetric And Mechanical Properties Of Laboratory And Field Specimens Of Asphalt Concrete
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Author : Louay Nadhim Mohammad
language : en
Publisher:
Release Date : 2016
Comparing The Volumetric And Mechanical Properties Of Laboratory And Field Specimens Of Asphalt Concrete written by Louay Nadhim Mohammad and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Asphalt concrete categories.
This reports document research that was performed to (1) determine causes of variability and tolerances for volumetric and mechanical properties of dense-graded asphalt mixtures measured within and among the three specimen types; and (2) propose a practice for state departments of transportation to incorporate these results in specifications and criteria for quality assurance, mix design verification or validation, and structural design and forensic studies. The research was conducted in two phases. In Phase I, datasets of laboratory and field test data were collected and pooled in a meta-analysis in an attempt to determine levels of variability in asphalt mixtures and the factors causing variability among and between the three specimen types. Despite the inclusion of 25 extensive datasets representing roughly 8,000 individual mixtures in the meta-analysis, the results of the analysis were inconclusive. Phase II was then undertaken—a program testing specimens from paving projects across the United States to quantify the effects of process-based factors on the variability of volumetric and mechanical properties of the specimen types. The key outcome of the research is a proposed practice for evaluating the cause and magnitude of variability within and among the three specimen types. In addition, tolerances of volumetric and conversion factors between the three specimen types of mechanical properties evaluated are proposed based on the average difference between specimen comparisons for the mixtures evaluated in Phase II. Agencies may use these proposed values to evaluate and adjust their current tolerances.
Evaluation Of Volumetric And Mechanistic Properties Of Asphaltic Mixtures
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Author : Samuel B. Cooper (III)
language : en
Publisher:
Release Date : 2015
Evaluation Of Volumetric And Mechanistic Properties Of Asphaltic Mixtures written by Samuel B. Cooper (III) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Comparing The Volumetric And Mechanical Properties Of Laboratory And Field Specimens Of Asphalt Concrete
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Author : Louay Nadhim Mohammad
language : en
Publisher:
Release Date : 2016
Comparing The Volumetric And Mechanical Properties Of Laboratory And Field Specimens Of Asphalt Concrete written by Louay Nadhim Mohammad and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Asphalt concrete categories.
This reports document research that was performed to (1) determine causes of variability and tolerances for volumetric and mechanical properties of dense-graded asphalt mixtures measured within and among the three specimen types; and (2) propose a practice for state departments of transportation to incorporate these results in specifications and criteria for quality assurance, mix design verification or validation, and structural design and forensic studies. The research was conducted in two phases. In Phase I, datasets of laboratory and field test data were collected and pooled in a meta-analysis in an attempt to determine levels of variability in asphalt mixtures and the factors causing variability among and between the three specimen types. Despite the inclusion of 25 extensive datasets representing roughly 8,000 individual mixtures in the meta-analysis, the results of the analysis were inconclusive. Phase II was then undertaken--a program testing specimens from paving projects across the United States to quantify the effects of process-based factors on the variability of volumetric and mechanical properties of the specimen types. The key outcome of the research is a proposed practice for evaluating the cause and magnitude of variability within and among the three specimen types. In addition, tolerances of volumetric and conversion factors between the three specimen types of mechanical properties evaluated are proposed based on the average difference between specimen comparisons for the mixtures evaluated in Phase II. Agencies may use these proposed values to evaluate and adjust their current tolerances.
Effects Of Temperature Segregation On The Volumetric And Mechanistic Properties Of Asphalt Mixtures
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Author : Louay Nadhim Mohammad
language : en
Publisher:
Release Date : 2019
Effects Of Temperature Segregation On The Volumetric And Mechanistic Properties Of Asphalt Mixtures written by Louay Nadhim Mohammad and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with TECHNOLOGY & ENGINEERING categories.
Design And Characterization Of Asphalt Mixtures Based On Particle Packing And Mechanical Modeling
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Author : Huanan Yu
language : en
Publisher:
Release Date : 2012
Design And Characterization Of Asphalt Mixtures Based On Particle Packing And Mechanical Modeling written by Huanan Yu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Existing asphalt mixture design approaches are mainly empirical based "trial-and-error" methods. Based purely on volumetrics, such design methods have little consideration of the mechanical performance of the mixtures. With the trend of moving the pavement research into more mechanistic based methods and targeting the ultimate goal to good field performance, it is necessary to develop a sophisticated mix design and characterization methodology which can help the designer understand the expected engineering performance of the mix at the early stages, at the same time, to have a more efficient tool to evaluate the quality of the mixtures. This research develops a comprehensive aggregate gradation and asphalt mixture design method that estimates the mechanical properties of the mix at early stage. In this method, strong correlations between aggregate properties, volumetrics, and mechanical properties are identified, making the VMA (Voids in Mineral Aggregate) an excellent media to link the properties of aggregates and asphalt binder to their engineering performance. The concept of the design procedure, especially the aggregate gradation design procedure, is largely based on an analysis of aggregate packing and interlocking. As a fast and convenient design method that emphasizes more on the mechanical performance of the mix, the new design method can be used to evaluate the quality of an existing gradation and mix design, and adjust the gradation of a new mix to satisfy both volumetrics and mechanical properties. In addition, the characteristics of asphalt mixture are studied using micromechanical based discrete element method (DEM) and macromechanical modeling. In DEM simulation, an image based ball clumping technique is used for simulating the angularity properties of aggregate particles. The DEM model is established and calibrated to describe the viscoelastic (dynamic modulus and phase angle) and viscoelastic plastic (strength) properties of asphalt mixtures with or without damage involved. As for macromechanical modeling, a constitutive model for characterizing the permanent deformation of asphalt mixture is explored by taking consideration of the directional distribution of aggregates (anisotropy), and the damage induced by plasticity.
Evaluation Of Engineering Properties Of Hot Mix Asphalt Concrete For The Mechanistic Empirical Pavement Design
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Author :
language : en
Publisher:
Release Date : 2009
Evaluation Of Engineering Properties Of Hot Mix Asphalt Concrete For The Mechanistic Empirical Pavement Design written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Data evaluation of the test results indicated the increase of nominal maximum size aggregate amount by 5% to 15% to the standard coarse mix designs had negligible effect on HMA fracture mechanics properties. The SBS polymer-modified asphalt binder improved the fracture mechanics behavior of asphalt mixtures comprehensively. The limestone materials hold advantages over granite materials in improving the performance of thermal cracking at low service temperatures and the rutting resistance at high service temperatures. The master curve construction and linear regression analysis indicated that the total resilient modulus increased with an increase in dynamic modulus at a specific loading frequency. The resilient modulus values were comparable with the dynamic modulus values at the loading frequency of 4 Hz. A correlation relationship was developed for predicting the dynamic modulus from existing resilient modulus values of the asphalt concrete mixture in implementing the mechanistic-empirical pavement design.
Advances In Materials And Pavement Performance Prediction Ii
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Author : K. Anupam
language : en
Publisher: CRC Press
Release Date : 2020-12-08
Advances In Materials And Pavement Performance Prediction Ii written by K. Anupam and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-12-08 with Juvenile Nonfiction categories.
Inspired from the legacy of the previous four 3DFEM conferences held in Delft and Athens as well as the successful 2018 AM3P conference held in Doha, the 2020 AM3P conference continues the pavement mechanics theme including pavement models, experimental methods to estimate model parameters, and their implementation in predicting pavement performance. The AM3P conference is organized by the Standing International Advisory Committee (SIAC), at the time of this publication chaired by Professors Tom Scarpas, Eyad Masad, and Amit Bhasin. Advances in Materials and Pavement Performance Prediction II includes over 111 papers presented at the 2020 AM3P Conference. The technical topics covered include: - rigid pavements - pavement geotechnics - statistical and data tools in pavement engineering - pavement structures - asphalt mixtures - asphalt binders The book will be invaluable to academics and engineers involved or interested in pavement engineering, pavement models, experimental methods to estimate model parameters, and their implementation in predicting pavement performance.
Asphalt Material Design Inputs For Use With The Mechanistic Empirical Pavement Design Guide In Virginia
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Author : Alex K. Apeagyei
language : en
Publisher:
Release Date : 2011
Asphalt Material Design Inputs For Use With The Mechanistic Empirical Pavement Design Guide In Virginia written by Alex K. Apeagyei and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Binders (Materials) categories.
The Guide for the Mechanistic-Empirical Design of New & Rehabilitated Pavement Structures (MEPDG), developed under NCHRP Project 1-37A and recently adopted by the American Association of State Highway and Transportation Officials (AASHTO), offers an improved methodology for pavement design and evaluation. To achieve this improved prediction capability, the MEPDG procedure requires fundamental material properties in addition to certain empirically determined binder and mixture properties as design inputs. One of the key tasks identified by the Virginia Department of Transportation's (VDOT) Asphalt Concrete MEPDG Committee was the laboratory characterization of asphalt mixtures commonly used in Virginia to generate a catalog of the MEPDG-required design inputs. The purpose of this study was to evaluate, compile, and present asphalt material properties in a format that could be readily used in the MEPDG software and to develop a comprehensive catalog of MEPDG design input parameters for pavement design in Virginia. To achieve this objective, 18 asphalt concrete mixtures, sampled from seven of the nine VDOT districts, were tested using a battery of MEPDG-required tests including dynamic modulus (E*), flow number (FN), creep compliance, tensile strength, and beam fatigue tests. Testing involving binder and volumetric properties of the mixtures was also conducted. Finally, rut tests using the asphalt pavement analyzer (APA), a standard VDOT test protocol, were conducted to enable a direct comparison of the APA and FN test results. On the basis of these tests, suggestions for additional studies were made. The results of the study were presented in a form matching the MEPDG input format, and a catalog of design input parameters was developed for the 18 asphalt concrete mixtures. Included in the catalog were binder stiffness, mixture E*, mixture gradation, and mixture volumetric properties that would enable a designer the flexibility to select the desired input level (1, 2, or 3) depending on the pavement type. An illustrative example of how the developed inputs could be implemented using the MEPDG software was also provided. The results showed that E* master curves of asphalt mixtures obtained using the five standard testing temperatures described in AASHTO TP 62 could be obtained by testing at only three temperatures, which could result in a substantial reduction of testing time. The results also showed that the FN test was a sensitive test for evaluating rutting susceptibility of asphalt mixtures in the laboratory. The FN test was found to be sensitive to binder stiffness, mixture stiffness, mixture volumetric properties, aggregate gradation, and amount of recycled asphalt pavement (RAP) for the mixtures considered in this study. The study recommends that the catalog of input data for typical asphalt mixtures developed in this study be considered for pavement design in Virginia. The data followed expected trends and compared quite well with those reported in previous studies. Further studies should be conducted to evaluate the FN test as an additional tool for evaluating rutting in asphalt mixtures. Mixtures containing higher amounts of RAP (>20%) exhibited comparatively lower rutting resistance than those with 20% or less RAP. This phenomenon was unexpected since it is generally believed that adding more RAP should result in stiffer and hence more rut-resistant mixtures. Additional research should be conducted to investigate this phenomenon further.
Mechanistic Evaluation Of Superpave Level 1 Mixtures
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Author : Rajesh Kaldate
language : en
Publisher:
Release Date : 2001
Mechanistic Evaluation Of Superpave Level 1 Mixtures written by Rajesh Kaldate and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Asphalt concrete categories.