Effect Of Gradation And Other Mixture Properties On The Cracking Resistance Of Asphalt Mixtures
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Effect Of Gradation And Other Mixture Properties On The Cracking Resistance Of Asphalt Mixtures
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Author : Karina Enrico Honeycutt
language : en
Publisher:
Release Date : 2000
Effect Of Gradation And Other Mixture Properties On The Cracking Resistance Of Asphalt Mixtures written by Karina Enrico Honeycutt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
Predicting Asphalt Mixture Cracking Resistance From Properties Of Asphalt Mastics
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Author : Mohammed Ziaur Rahaman
language : en
Publisher:
Release Date : 2020
Predicting Asphalt Mixture Cracking Resistance From Properties Of Asphalt Mastics written by Mohammed Ziaur Rahaman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
The current test methods for measuring fatigue cracking resistance of asphalt mixtures involves many steps which are time-consuming and costly. On the other hand, asphalt binder and mastic testing are less time consuming and more accessible to practitioners than mixtures testing. Therefore, if the routinely measured properties of asphalt binders, fillers, and volumetric parameters of asphalt mixtures can be used to predict cracking resistance of mixtures, the effort to perform mixtures testing of asphalt mixtures can be minimized. The objective of this study is to develop prediction models for cracking and damage behavior of asphalt mixtures using the stepwise regression method at intermediate temperatures from limited laboratory testing of binders and mixture volumetric properties routinely done in practice. In the first phase of this study, the effects of physical and chemical properties of fillers on fatigue of asphalt mastic are measured using LAS test are measured. Then prediction models of Linear Amplitude Sweep (LAS) parameters of the mastics are developed using the physical (Rigden Voids-RV and Fineness Modulus-FM), chemical properties (Calcium Oxide and Methylene Blue) of the fillers, and the LAS parameters of the binders. The results show that the fatigue cracking resistance of mastic is dependent on the interaction between base asphalt binder and filler type. The results also show that the effect of fillers on the fatigue life of mastic is dependent on the failure criterion used in the analysis of LAS test. It is also found that the fatigue cracking resistance (LAS Parameters) of mastic can be predicted reliably from Rigden Voids and LAS parameters of binders. In the second phase of the study, prediction models of cracking resistance of mixtures as measured by the Semi-Circular Bending- Illinois Flexibility Index Test (SCB-IFIT) are developed using an experimental database including 44 mixtures that are short-term-aged and 30 for long-term-aged mixtures. These mixtures are produced with varying combinations of Recycled Asphalt Pavement (RAP), binder, aggregate sources, and fillers. More specifically, models for the SCB parameters (Flexibility Index (FI), post-peak slope, and Fracture Energy (Gf) models are constructed using various independent variables such as asphalt content, asphalt film thickness, aggregate gradation, RAP content, LAS parameter of binder and mastic properties. A sensitivity analysis is performed to access the impact of these independent variables on SCB parameters. Based on the correlation and validation results, the developed models of SCB parameters are found to predict the FI, post-peak slope and Gf of asphalt mixtures with high accuracy. The developed models are recommended to use for estimating the fatigue cracking resistance of asphalt mixtures when testing is not feasible or as an initial step for selection of mixture designs and binder grades before mixture testing.
Discrete Element Modeling Of Influences Of Aggregate Gradation And Aggregate Properties On Fracture In Asphalt Mixes
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Author : Enad Muhib Ahmad Mahmoud
language : en
Publisher:
Release Date : 2010
Discrete Element Modeling Of Influences Of Aggregate Gradation And Aggregate Properties On Fracture In Asphalt Mixes written by Enad Muhib Ahmad Mahmoud and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Aggregate strength, gradation, and shape play a vital role in controlling asphalt mixture performance. Many studies have demonstrated the effects of these factors on asphalt mixture performance in terms of resistance to fatigue cracking and rutting. This study introduces numerical and analytical approaches supported with imaging techniques for studying the interrelated effects of aggregate strength, gradation, and shape on resistance of asphalt mixtures to fracture. The numerical approach relies on the discrete element method (DEM). The main advantage of this approach is the ability to account for the interaction between the internal structure distribution and aggregate properties in the analysis of asphalt mixture response and performance. The analytical approach combines aggregate strength variability and internal force distribution in an asphalt mixture to predict the probability of aggregate fracture. The numerical and analytical approaches were calibrated and verified using laboratory tests on various aggregate types and mixtures. Consequently these approaches were used to: (1) determine the resistance of various mixture types with different aggregate properties to fracture, (2) study the effects of aggregate strength variability on fracture, (3) quantify the influence of blending different types of aggregate on mixture strength, (4) develop a mathematical expression for calculating the probability of aggregate fracture within asphalt mixture, and (5) relate cracking patterns (cohesive: aggregate - aggregate and matrix - matrix, and adhesive: aggregate - matrix) in an asphalt mixture to internal structure distribution and aggregate properties. The results of this dissertation established numerical and analytical techniques that are useful for developing a virtual testing environment of asphalt mixtures. Such a virtual testing environment would be capable of relating the microscopic response of asphalt mixtures to the properties of the mixture constituents and internal structure distribution. The virtual testing environment would be an inexpensive mean to evaluate the influence of changing different material and design factors on the mixture response.
Effect Of Interstitial Volume Characteristics On Asphalt Mixture Durability And Cracking Performance
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Author : Marco Isola
language : en
Publisher:
Release Date : 2014
Effect Of Interstitial Volume Characteristics On Asphalt Mixture Durability And Cracking Performance written by Marco Isola and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
It is well documented in the literature that performance of asphalt mixture is directly related to aggregate structure. Several theories have been proposed to characterize internal structure and link gradation to aggregate structure and mixture performance. Specifically, relationships have been identified between the primary coarse aggregate structure and mixture resistance to rutting based on interactive coarse particles. However, research has shown that mixtures with acceptable rutting performance may or may not result in acceptable cracking performance. Moreover, it has been identified that the volume between the coarse aggregate structure may be a critical factor on mixture cracking performance and that having an adequate coarse aggregate structure may not be enough to accurately distinguish the cracking performance of asphalt mixture. The Dominant Aggregate Size Range - Interstitial Component (DASR-IC) model provides a framework of gradation-based parameters and associated criteria to link gradation characteristics and volumetric properties to aggregate structure, mixture properties, and field performance.
Evaluation Of Mix Ingredients On The Performance Of Rubber Modified Asphalt Mixtures
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Author : Hossein B. Takallou
language : en
Publisher:
Release Date : 1987
Evaluation Of Mix Ingredients On The Performance Of Rubber Modified Asphalt Mixtures written by Hossein B. Takallou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Asphalt-rubber categories.
Rubber-modified asphalt pavements have been used in Sweden and the United States since the 1970's. In these applications ground recycled tire particles (1/4 inch minus) are added to a gap-graded aggregate and then mixed with hot asphalt cement. The benefits of adding rubber to the mix include increased skid resistance under icy conditions, improved flexibility and crack resistance, elimination of solid waste, and reduced traffic noise. The major disadvantage of these rubber-modified mixes is their high cost in relation to conventional asphaltic concrete pavements. This research project consisted of a laboratory study of mix properties as a function of variables such as rubber gradation and content, void content, aggregate gradation, mix process, temperature, and asphalt content. Twenty different mix combinations were evaluated for diametral modulus and fatigue at two different temperatures ( -6°C, +10°C). Also, five different mix combinations were evaluated for static creep and permanent deformation. Layered theory was used to evaluate the effects of mixture variations on pavement life. The resulting information was used to develop guidelines for use of rubber asphalt mixes in United States road systems. The findings of the field survey indicate that the rubber-modified asphalt mixture is more susceptible than the conventional mixtures to preparation and compaction problems when adverse weather or equipment problems occur. However, with adequate equipment and favorable weather conditions, the rubber-modified asphalt mixture placement is similar to conventional mixture placement. The field study also indicates that stopping distances can be reduced 20 percent for the rubber-modified pavements in icy conditions. In view of the significant reductions in wintertime stopping distances under icy or frosty road surface conditions, the use of coarse rubber in asphalt pavements should be seriously considered. This is particularly true for areas such as bridge decks, on and off freeway ramps or insulated roadway sections. The findings of the laboratory study indicate that the rubber gradation and content, aggregate gradation, and use of surcharge during sample preparation have considerable effect on modulus and fatigue life of the mix. The results of static creep and permanent deformation tests indicate that the rubber asphalt mixes had low stability and high elasticity. Also, due to greater allowable tensile strain in rubber-modified mixtures, the thickness of the modified mixture can be reduced, using a layer equivalency of 1.4 to 1.0.
Effects Of Thermo Volumetric Properties Of Modified Asphalt Mixtures On Low Temperature Cracking
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Author : Kitae Nam
language : en
Publisher:
Release Date : 2005
Effects Of Thermo Volumetric Properties Of Modified Asphalt Mixtures On Low Temperature Cracking written by Kitae Nam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Influence Of Fine Aggregate Content On Low Temperature Cracking Of Asphalt Pavements
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Author : H. Ma
language : en
Publisher:
Release Date : 2016
Influence Of Fine Aggregate Content On Low Temperature Cracking Of Asphalt Pavements written by H. Ma and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Aggregate gradation categories.
Low-temperature cracking occurs on some asphalt pavements even though the high-performance grade (PG) binders are applied in asphalt mixtures. It is neither realistic nor economic to solve the problems related to low-temperature cracking on asphalt pavements by purely using high PG binders. Other factors need to be investigated so that this type of distress can be further restrained. This study focuses on investigating the effect of fine aggregates on the low-temperature cracking on asphalt pavements. Low-temperature cracking was monitored and recorded on asphalt pavements in a cold, northeast area of China. Cores were drilled on the spots where low-temperature cracking occurred, and the aggregate gradations of the drilled cores were analyzed in the laboratory. An index called the Fine Aggregate Content Deviation Index (FACDI) was defined as the difference between the actual fine aggregate content and the lower limit of fine aggregate content in the designed aggregate gradation. A positive relation was observed between the FACDI and the cracking index of asphalt pavements. It was demonstrated that the fine aggregate content was another important factor that influences low-temperature cracking of asphalt pavement. The increase of fine aggregate content was found to jeopardize the resistance of asphalt mixture on low-temperature cracking. Based on FACDI, fine aggregate's contents in asphalt mixtures of asphalt layers can be recommended to ensure an asphalt pavement with good low-temperature performance.
Investigation Of Cracking Performance Of Asphalt Rubber Gap Graded Mixtures Statistical Overview On Materials Interface
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Author : Veena Venudharan
language : en
Publisher:
Release Date : 2019
Investigation Of Cracking Performance Of Asphalt Rubber Gap Graded Mixtures Statistical Overview On Materials Interface written by Veena Venudharan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Asphalt categories.
This study investigated the cracking mechanism of Asphalt-Rubber Gap-graded (AR-Gap) mixtures with various material properties. The research focused on using a monotonic semicircular bending (SCB) test to estimate the cracking potential of AR-Gap mixtures at 0C and 25C. A total of 28 asphalt mixtures, including 27 AR-Gap mixtures and 1 conventional dense-graded (DG) mix, covering over 220 data points were utilized for evaluation. The outcome parameter, fracture toughness,KIC, calculated from the SCB test was used to compare and contrast the mixtures resistance to cracking at low and intermediate temperatures. At both test temperatures, the results indicated that AR-Gap mixtures have higher fracture resistance (~60 %) than the DG mix. Furthermore, statistical analyses confirmed that asphalt binder type, aggregate gradation, and binder content had significant effects on cracking performance. Aggregate gradation had a more pronounced effect on cracking performance than binder type, followed by binder content. In addition, aKICpredictive model was developed that had excellent statistical goodness-of-fit measures (R2 >= 90 %), which can be conveniently utilized in case of unavailability of the test setup. Overall, the findings revealed superior performance characteristics of AR-Gap mixtures that had high potential to resist cracking. Based on the various outcomes, the study was able to recommend aggregate gradation, binder type, and binder content as the parameters that would exhibit higher resistance against cracking failure. It is envisaged that this research would further the state of the art in designing crack-resistant asphalt mixtures.
Fracture Behavior Of Asphalt Materials
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Author : Sadjad Pirmohammad
language : en
Publisher: Springer Nature
Release Date : 2020-02-18
Fracture Behavior Of Asphalt Materials written by Sadjad Pirmohammad and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-02-18 with Technology & Engineering categories.
This book discusses the applications of fracture mechanics in the design and maintenance of asphalt concrete overlays. It provides useful information to help readers understand the effects of different material and loading type parameters on the fracture properties of asphalt concretes. It also reviews relevant numerical and experimental studies, and describes in detail design parameters such as aggregate type, air void, loading mode, and additives, based on the authors experience and that of other researchers.
Asphalt Pavements
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Author : Patrick Lavin
language : en
Publisher: CRC Press
Release Date : 2014-04-21
Asphalt Pavements written by Patrick Lavin and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-04-21 with Architecture categories.
Asphalt Pavements provides the know-how behind the design, production and maintenance of asphalt pavements and parking lots. Incorporating the latest technology, this book is the first to focus primarily on the design, production and maintenance of low-volume roads and parking areas. Special attention is given to determining the traffic capacity, required thickness and asphalt mixture type for parking applications. Topics covered include: material information such as binder properties, testing grading and selection; construction information such as mixing plant operation, proportioning, mixture placement and compaction; and design information such as thickness and mixture design methods and guidelines on applying these to highways, city streets and parking Areas. It is an essential practical guide aimed at those engineers and architects who are not directly involved in the asphalt industry, but who nonetheless need to have a good general knowledge of the subject. Asphalt Pavements provides a novice with enough information to completely design, construct and specify an asphalt pavement.