Download or read book Characterization of Failure Properties of Asphalt Binder written by DA. Anderson and published by . This book was released on 1995 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes the characterization of the uniaxial failure properties of the eight core asphalt cements from the Strategic Highway Research Program (SHRP). Uniaxial tensile failure properties of asphalts are highly dependent on temperature and loading (elongation) rate. The tensile failure properties of the eight core asphalts were obtained for various temperatures ranging from -30 to 0°C (22 to 30°F) and elongation rates ranging from 2.5 to 50 mm/min (0.1 to 2 in/min). Mastercurves were obtained for failure stress, failure strain, and failure energy versus loading time using time-temperature superposition. The time-temperature shift factors were obtained from rheological studies of asphalts using dynamic mechanical testing conducted separately but as a part of the same project. A function describing the failure mastercurves was developed.

Download or read book Binder Characterization and Evaluation written by David A. Anderson and published by Strategic Highway Research Program (Shrp). This book was released on 1994 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Binder Characterization and Evaluation Test methods written by and published by . This book was released on 1994 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physical Properties of Asphalt Cement Binders written by John C. Hardin and published by ASTM International. This book was released on 1995 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: A dozen papers from a December 1993 symposium in Dallas/Fort Worth, Texas. Among the topics are why the new proposed rheological properties of asphalt binders are required and how they compare to conventional properties, the development and use of the SHRP direct tension specification test, oxidatio

Download or read book Fatigue Characterization of Asphalt Binders Using a Thin Film Poker Chip Test written by Ramez Muhammad Hajj and published by . This book was released on 2016 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Asphalt binder is the adhesive that holds together aggregate particles of different sizes of an asphalt mixture. The tensile properties of an asphalt binder can greatly affect the performance of the asphalt mixture under repeated traffic loading. While the current performance grade specification has been in use for a long time to characterize the asphalt binders with regards to fatigue, it has been shown to be largely ineffective. This study was performed with the goal of investigating a strength-based measure to evaluate the fatigue cracking resistance of the asphalt binder. The poker chip geometry was used for this purpose. The test involved tensile loading of a thin film of asphalt binder between two rigid substrates. The first part of this study focused on determining failure criteria for the test. The second part was a study of the binders that have a similar grade based on the current performance grade specification but are expected to perform differently due to difference in their chemical makeup. Finally, the third part involved a study of the effects of nanomaterials as additives on the strength of the binder based on poker chip test results. The results demonstrated that failure strain criteria is promising as a material property, but still needs further study for validation. It was also observed that binders with similar performance grade had significantly different tensile strength. Finally, it was observed that nanomaterials had a significant impact on the test results of unaged binder, but had less effect on aged asphalt binders.

Download or read book Testing and Characterization of Asphalt Materials and Pavement Structures written by Kun Zhang and published by Springer. This book was released on 2018-07-11 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents new studies dealing with the attempts made by the scientists and practitioners to address contemporary issues in pavement engineering such as aging and modification of asphalt binders, performance evaluation of warm mix asphalt, and mechanical-based pavement structure analysis, etc.. Asphalt binder and mixture have been widely used to construct flexible pavements. Mechanical and Chemical characterizations of asphalt materials and integration of these properties into pavement structures and distresses analysis are of great importance to design a sustainable flexible pavement. This book includes discusses and new results dealing with these issues. Papers were selected from the 5th GeoChina International Conference 2018 – Civil Infrastructures Confronting Severe Weathers and Climate Changes: From Failure to Sustainability, held on July 23 to 25, 2018 in HangZhou, China.

Download or read book Binder Characterization and Evaluation written by Peterson and published by Strategic Highway Research Program (Shrp). This book was released on 1994 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: This final report, in four volumes, of Strategic Highway Research Program (SHRP) Project A-002A describes intensive investigations of the chemical and physical properties of petroleum asphalts used in the construction of highway pavements. The model and predictive capability constitute the major portion of volume 1.

Download or read book 8th RILEM International Symposium on Testing and Characterization of Sustainable and Innovative Bituminous Materials written by Francesco Canestrari and published by Springer. This book was released on 2015-09-24 with total page 1024 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents the results of RILEM TC 237-SIB (Testing and characterization of sustainable innovative bituminous materials and systems). The papers have been selected for publication after a rigorous peer review process and will be an invaluable source to outline and clarify the main directions of present and future research and standardization for bituminous materials and pavements. The following topics are covered: - Characterization of binder-aggregate interaction - Innovative testing of bituminous binders, additives and modifiers - Durability and aging of asphalt pavements - Mixture design and compaction analysis - Environmentally sustainable materials and technologies - Advances in laboratory characterization of bituminous materials - Modeling of road materials and pavement performance prediction - Field measurement and in-situ characterization - Innovative materials for reinforcement and interlayer systems - Cracking and damage characterization of asphalt pavements - Recycling and re-use in road pavements This is the proceedings of the RILEM SIB2015 Symposium (Ancona, Italy, October 7-9, 2015).

Download or read book Effect of Asphalt Modification on Failure Properties of Asphalt Binders written by Kitae Nam and published by . This book was released on 2001 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of Modified Asphalt Binders in Superpave Mix Design written by Hussain U. Bahia and published by . This book was released on 2001 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Testing and Characterization of Bituminous Materials Two Volume Set written by Andreas Loizos and published by CRC Press. This book was released on 2009-05-14 with total page 1318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bituminous materials are used to build durable roads that sustain diverse environmental conditions. However, due to their complexity and a global shortage of these materials, their design and technical development present several challenges. Advanced Testing and Characterisation of Bituminous Materials focuses on fundamental and performance testing

Download or read book Evaluation of the Effects of Asphalt Binder on the Properties of Hot Mix Asphalt at Intermediate Temperatures written by Haifang Wen and published by . This book was released on 2011 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The asphalt binder is an essential component of asphaltic mixtures. The performance of an asphaltic mixture is directly related to mechanical characteristics of the binder. With the development of new material characterization methods for both asphalt binder and asphaltic mixture, there is a need to re-evaluate the relationship between the properties of binders and asphaltic mixtures such that a proper understanding and selection of an asphalt binder can be made to improve the performance of an asphaltic mixture. In this study, the effects of asphalt binder properties on asphaltic mixtures at intermediate temperatures were evaluated based on recent developments on material characterization methods for both binder and asphaltic mixture. Five asphalt binders and five asphalt mixtures containing these binders with one aggregate were tested. Four of the binders were based on a modification of a base binder with different techniques. Complex shear modulus and monotonic constant shear-rate tests were conducted on asphalt binders, whereas dynamic modulus and indirect tensile strength tests were conducted on the mixtures. The effects of modification techniques on the properties of asphalt binders and the relationships between the properties of binders and asphaltic mixtures were evaluated in this study.

Download or read book Introduction to continuum damage mechanics written by L. Kachanov and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern engineering materials subjected to unfavorable mechanical and environmental conditions decrease in strength due to the accumulation of microstructural changes. For example, considering damage in metals we can mention creep damage, ductile plastic damage, embrittlement of steels and fatigue damage. To properly estimate the value of damage when designing reliable structures it is necessary to formulate the damage phenomenon in terms of mechanics. Then it is possible to analyse various engineering problems using analytical and computational techniques. During the last two decades the basic principles of continuum damage mechanics were formulated and some special problems were solved. Many scientific papers were published and several conferences on damage mechanics took place. Now continuum damage mechanics is rapidly developing branch of fracture mechanics. This book is probably the first one on the subject; it contains a sys tematic description of the basic aspects of damage mechanics and some of its applications. In general, a theoretical description of damage can be rather compli cated. The experiments in this field are difficult (especially under multiax ial stress and non-proportional loading). Therefore, experimental data, as a rule, are scarce. Determination of functions and constants, which play a role in the complex variants of the theory, from available experimental data is often practically impossible. ix L.M. Kachanov The problems of damage mechanics are mainly engineering ones. Therefore, the author tries to avoid superfluous mathematical formalism. Some more details of the book's subject can be found in the list of con tents.

Download or read book Fracture Properties and Fatigue Cracking Resistance of Asphalt Binders written by Arash Motamed and published by . This book was released on 2012 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several different types of modifiers are increasingly being used to improve the performance of asphalt binders or to achieve desired mixture production characteristics (e.g., Warm Mix Asphalt). However, current Superpave performance specifications do not accurately reflect the performance characteristics of these modified binders. The main objective of this study was to evaluate the inherent fatigue cracking resistance of asphalt binders in the form of a matrix with rigid particle inclusions. The underlying rationale for this approach was to subject the binders to a state of stress that is similar to the one in a full asphalt mixture. This was achieved by fabricating and testing composite specimens of the asphalt binders and glass beads with a specified gradation. Four asphalt binders with similar true temperature grades but different modifiers were used in this study. The viscoelastic and fatigue cracking characteristics of the binders were measured using the glass bead-binder composite specimens in a dynamic shear rheometer at an intermediate temperature. The results demonstrate that the four asphalt binders modified using different methods had different damage characteristics despite the fact that these four binders were rated to have a similar performance grade based on the Superpave specifications. Fatigue cracking characteristics of the glass bead-binder test specimens used in this study were qualitatively very similar to the fatigue cracking characteristics of full asphalt mixtures using the same binders. The rank order of fatigue cracking resistance for the four glass bead-binder mixtures compared reasonably well to the rank order of fatigue cracking resistance for the full asphalt mixtures that incorporated these asphalt binders.

Download or read book Using Mastic Characterization to Predict Asphalt Mixture Low temperature Cracking Behavior written by and published by . This book was released on 2015 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low temperature performance grading currently relies solely on Bending Beam Rheometer (BBR) for determining low temperature creep stiffness (S) and rate of modulus relaxation (m-value) at 60s, both determined at low stress-strain levels, in the pre-failure zones. This aspect raises questions with regard to applicability of properties derived from the linear viscoelastic range for prediction of asphalt binder thermal cracking behavior. Furthermore, many researchers have reported a discrepancy between field cracking severity and predictions based on asphalt binder properties since the asphalt binder-aggregate interaction is non-existent in asphalt binder testing. Therefore evaluation of asphalt mastics properties which could save a considerable amount of time and equipment in comparison to mixture testing should be prioritized. These challenges indicate that considering fracture properties of asphalt mastics could be a better approach for prediction of thermal cracking in asphalt pavements. It is believed that development of failure master curves for the damage characterization of asphalt mastics at different temperatures and loading rates would be beneficial for better characterization of resistance to thermal cracking. Therefore, in this dissertation a mechanistic approach on the development of such asphalt mastic failure master curves was derived using the new BBR-SENB test for damage resistance characterization. The complexity of the viscoelastic behavior of asphalt mastics in terms of time and temperature dependency is also recognized by the sensitivity of the failure properties to changes in loading time and temperature. This dissertation documents the development, calibration, and validation of a fundamental analysis framework of asphalt mixtures thermal cracking behavior using asphalt mastics as the continuous phase of these mixtures. Key conceptual components of this study include applying time temperature superposition principles to large strain failure properties, development of asphalt mastic failure master curves, and investigating relationship between mastic viscosity and aggregate structure of asphalt mixtures in the context of thermo-volumetric properties of mixtures. An analysis framework for predicting thermal cracking of asphalt mixtures was developed which include considering asphalt mastics, aggregate internal structure and temperature dependent thermo-volumetric properties. Results where compared to experimental data measured using the ATCA device, which allowed measuring strain and stress build up during cooling.

Download or read book Microstructural Characterization of Material Properties and Damage in Asphalt Composites written by Sara Mohammad Khorasani and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Asphalt composites are used to construct 90% of roads in the United States. These composites consist of asphalt binder, which is a product of the refinery process of oil, aggregates, and air voids. Fatigue cracking is one of the most important distresses that causes damage in asphalt pavements. However, there is still a gap in the understanding of the fatigue process of asphalt composites, such as the influence of material properties on this phenomenon and how the material microstructure changes as a result of fatigue damage. This study focuses on the results of two experiments that were performed on asphalt composites to better understand phenomena related to fatigue cracking: nano-mechanical characterization of the properties of the asphalt composite material and X-ray Computed Tomography nondestructive imaging of damage in the microstructure. These experimental measurements were performed on specimens that are first damaged in the Dynamic Mechanical Analyzer (DMA). The DMA is a tool commonly used for the characterization of fatigue cracking. This test method applies cyclic loads on asphalt composites, damaging them, and in the process determines the viscoelastic properties of the composite throughout the test. The nano-mechanical characterization experiment gives valuable results of the elastic modulus and hardness of the aggregate, binder, and the aggregate-binder interface that can be used to characterize different binder and aggregate combinations. The nanoindentation experiment successfully measured interface properties in the mix. The interface has elastic modulus and hardness values greater than the binder but smaller than the aggregate. This demonstrates that an interaction between these two phases creates a dissimilar phase between the two. The second experiment using X-ray CT gives measurements that are indicative of the influences of fatigue damage on micro-level changes in the material microstructure. The results of this experiment revealed important changes regarding the nature of fatigue damage and its relationship to changes in the geometry of air voids and cracks in asphalt composites. The X-ray CT experiment measured size and shape parameters of air voids at 20 microns/pixel resolution at different damage levels. These results illustrated that reduction in bonding strength in the binder is involved in failure in the mix and thus fatigue cracking is not solely responsible for failure. This conclusion is made based on the results not showing a statistically significant change in air void shape and size parameters with increased damage. This is illustrated by viewing changes in the air void structure within the mix, there is no evidence of crack propagation, or drastic changes in the shape, size, or volume of air voids within the mix. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/149446

Download or read book Characterization of Asphalt Properties and Asphalt aggregate Interaction Using Molecular Dynamics Simulation written by Guangji Xu and published by . This book was released on 2017 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this dissertation are to discover the chemo-mechanical relationship of asphalt binder, to investigate asphalt-aggregate interfacial mechanical behavior, and to understand moisture damage and rejuvenation mechanism using computational modeling. Molecular dynamics (MD) simulations were utilized to understand the properties of assemblies of asphalt molecules in terms of their chemical compositions, molecular structures and atomic interaction, which serve as complements to conventional laboratory experiments conducted at the macroscopic level. Molecular models of asphalt material were prepared and a series of molecular simulations were carried out. The following tasks were conducted using MD simulations: (1) identify and validate available molecular models of asphalt binder; (2) predict physical, thermodynamic, rheological, and diffusive properties of asphalt binder; (3) build atomistic models for asphalt-aggregate interface, and study adhesion and moisture damage; (4) link asphalt chemical compositions to asphalt properties and asphalt-aggregate interfacial interaction; (5) develop molecular models for aged asphalt, and investigate how oxidative aging affect properties of asphalt binders; (6) build molecular model for asphalt rejuvenator, and investigate interaction between virgin and aged asphalt binder with rejuvenator effect. The MD simulation results showed a reasonable agreement with experimental data and observations. MD simulation can be used as a powerful tool to study asphalt properties, giving the optimal molecular models and appropriate force field are available. Fundamental chemo-physical and chemo-mechanical relationship of asphalt binders can be studied by MD simulations. Insights into the deformation and failure mechanism of asphalt-aggregate interface at an atomistic scale provided by MD simulations enable better understand adhesion and moisture damage of asphalt mixture. The molecular interactions between virgin asphalt, aged asphalt, and rejuvenator is a sophisticated process but of great practical importance for recycling of asphalt binder. MD investigations can be further used to select the optimum type and amount of rejuvenator in an accelerated manner with less experiment effort.