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Author: Peter Lindelöf Publisher: ISBN: Category : Asphalt concrete Languages : en Pages : 13
Book Description
Increased interest in mechanistic evaluation of flexible pavement structures has brought a demand for accurate and practical methods, models, or both to estimate the mechanical properties of asphalt concrete mixtures. One of these properties is the Poisson's ratio (?) of asphalt concrete mixtures, which is often assumed to have a constant value of 0.35 in asphalt concrete evaluations. However, investigations have reported that mixture type, air void content, and temperature produce considerable variation in measured?-values that could have a significant effect on evaluations of asphalt concrete mixes. The objective of this study was to evaluate the effect of air voids, binder type, and testing conditions on the measured?-values. Indirect tensile (IDT) tests were conducted to measure?-values. The study indicated that the Poisson's ratio of the asphalt concrete mixes, on average, attained a maximum value at a particular level of air void content. Furthermore, when comparing the Poisson's ratio values in relation to the dynamic modulus, calculated using the Mechanistic Empirical Pavement Design Guide (MEPDG) equation, higher?-values were attained. This demonstrates the importance of measuring the Poisson's ratio of a mix type.Increased interest in mechanistic evaluation of flexible pavement structures has brought a demand for accurate and practical methods, models, or both to estimate the mechanical properties of asphalt concrete mixtures. One of these properties is the Poisson's ratio (?) of asphalt concrete mixtures, which is often assumed to have a constant value of 0.35 in asphalt concrete evaluations. However, investigations have reported that mixture type, air void content, and temperature produce considerable variation in measured?-values that could have a significant effect on evaluations of asphalt concrete mixes. The objective of this study was to evaluate the effect of air voids, binder type, and testing conditions on the measured?-values. Indirect tensile (IDT) tests were conducted to measure?-values. The study indicated that the Poisson's ratio of the asphalt concrete mixes, on average, attained a maximum value at a particular level of air void content. Furthermore, when comparing the Poisson's ratio values in relation to the dynamic modulus, calculated using the Mechanistic Empirical Pavement Design Guide (MEPDG) equation, higher?-values were attained. This demonstrates the importance of measuring the Poisson's ratio of a mix type.Increased interest in mechanistic evaluation of flexible pavement structures has brought a demand for accurate and practical methods, models, or both to estimate the mechanical properties of asphalt concrete mixtures. One of these properties is the Poisson's ratio (?) of asphalt concrete mixtures, which is often assumed to have a constant value of 0.35 in asphalt concrete evaluations. However, investigations have reported that mixture type, air void content, and temperature produce considerable variation in measured?-values that could have a significant effect on evaluations of asphalt concrete mixes. The objective of this study was to evaluate the effect of air voids, binder type, and testing conditions on the measured?-values. Indirect tensile (IDT) tests were conducted to measure?-values. The study indicated that the Poisson's ratio of the asphalt concrete mixes, on average, attained a maximum value at a particular level of air void content. Furthermore, when comparing the Poisson's ratio values in relation to the dynamic modulus, calculated using the Mechanistic Empirical Pavement Design Guide (MEPDG) equation, higher?-values were attained. This demonstrates the importance of measuring the Poisson's ratio of a mix type.
Author: Peter Lindelöf Publisher: ISBN: Category : Asphalt concrete Languages : en Pages : 13
Book Description
Increased interest in mechanistic evaluation of flexible pavement structures has brought a demand for accurate and practical methods, models, or both to estimate the mechanical properties of asphalt concrete mixtures. One of these properties is the Poisson's ratio (?) of asphalt concrete mixtures, which is often assumed to have a constant value of 0.35 in asphalt concrete evaluations. However, investigations have reported that mixture type, air void content, and temperature produce considerable variation in measured?-values that could have a significant effect on evaluations of asphalt concrete mixes. The objective of this study was to evaluate the effect of air voids, binder type, and testing conditions on the measured?-values. Indirect tensile (IDT) tests were conducted to measure?-values. The study indicated that the Poisson's ratio of the asphalt concrete mixes, on average, attained a maximum value at a particular level of air void content. Furthermore, when comparing the Poisson's ratio values in relation to the dynamic modulus, calculated using the Mechanistic Empirical Pavement Design Guide (MEPDG) equation, higher?-values were attained. This demonstrates the importance of measuring the Poisson's ratio of a mix type.Increased interest in mechanistic evaluation of flexible pavement structures has brought a demand for accurate and practical methods, models, or both to estimate the mechanical properties of asphalt concrete mixtures. One of these properties is the Poisson's ratio (?) of asphalt concrete mixtures, which is often assumed to have a constant value of 0.35 in asphalt concrete evaluations. However, investigations have reported that mixture type, air void content, and temperature produce considerable variation in measured?-values that could have a significant effect on evaluations of asphalt concrete mixes. The objective of this study was to evaluate the effect of air voids, binder type, and testing conditions on the measured?-values. Indirect tensile (IDT) tests were conducted to measure?-values. The study indicated that the Poisson's ratio of the asphalt concrete mixes, on average, attained a maximum value at a particular level of air void content. Furthermore, when comparing the Poisson's ratio values in relation to the dynamic modulus, calculated using the Mechanistic Empirical Pavement Design Guide (MEPDG) equation, higher?-values were attained. This demonstrates the importance of measuring the Poisson's ratio of a mix type.Increased interest in mechanistic evaluation of flexible pavement structures has brought a demand for accurate and practical methods, models, or both to estimate the mechanical properties of asphalt concrete mixtures. One of these properties is the Poisson's ratio (?) of asphalt concrete mixtures, which is often assumed to have a constant value of 0.35 in asphalt concrete evaluations. However, investigations have reported that mixture type, air void content, and temperature produce considerable variation in measured?-values that could have a significant effect on evaluations of asphalt concrete mixes. The objective of this study was to evaluate the effect of air voids, binder type, and testing conditions on the measured?-values. Indirect tensile (IDT) tests were conducted to measure?-values. The study indicated that the Poisson's ratio of the asphalt concrete mixes, on average, attained a maximum value at a particular level of air void content. Furthermore, when comparing the Poisson's ratio values in relation to the dynamic modulus, calculated using the Mechanistic Empirical Pavement Design Guide (MEPDG) equation, higher?-values were attained. This demonstrates the importance of measuring the Poisson's ratio of a mix type.
Author: Donald W. Christensen Publisher: Transportation Research Board ISBN: 0309088089 Category : Pavements, Asphalt Languages : en Pages : 62
Book Description
Introduction and Research Approach -- Findings -- Interpretation, Appraisal, and Applications -- Conclusions and Recommendations -- References -- Appendixes.
Author: Gerald A. Huber Publisher: ASTM International ISBN: 0803120028 Category : Asphalt emulsion mixtures Languages : en Pages : 237
Book Description
Thirteen papers presented at the conference on [title], held in Phoenix, Arizona, December, 1994, discuss the products of the strategic highway research program, the Superpave method of mix design, and test methods for fatigue cracking and permanent deformation. Lacks an index. Annotation c. by Book
Author: Elvis Alexander Castillo Camarena Publisher: ISBN: Category : Asphalt concrete Languages : en Pages : 54
Book Description
Poisson's ratio can be defined as the negative ratio of strains perpendicular to the load direction to the strains parallel to the loading direction. If elastic or viscoelastic models are used, Poisson's ratio, together with elastic modulus, is a main input used to predict distresses in flexible pavement structures such as rutting and cracking. In asphalt concrete, Poisson's ratio is commonly measured using two different testing configurations: indirect tension (IDT) and uniaxial. However, results from these two testing configuration can potentially have differences. Design methodologies such as the Mechanistic Empirical Design Guide (MEPDG, now PavementME) have been shown to be very sensitive to variations of Poisson's ratio. The objective of this research is to determine whether or not there are significant differences between the values of Poisson's ratio measured in indirect tension configuration and uniaxial configuration. This work also aims to investigate the potential variations of values of Poisson's ratio among a number of asphalt mixture treated with different types of asphalt modifiers: poplyphosphoric acid (PPA) alone and in combination with liquid anti-stripping agent (LAA). Cylindrical shaped samples specified in AASHTO T 342 were used to measure Poisson's ratio in uniaxial configuration, and disc shaped samples specified in AASHTO T 322 were used to measure Poisson's ratio in an IDT configuration. Samples were tested at each combination at the following temperatures, -10 °C, 4 °C, 21 °C, 37 °C, and 54 °C, and frequencies, 25 Hz, 10 Hz, 5 Hz, 1 Hz, 0.5 Hz, and 0.1 Hz. No statistical difference was found in values of Poisson's ratio measured within each testing configuration. IDT Poisson's ratio were significantly different to those of uniaxial configuration (3:1). This reduction of Poisson's ratio by about 60% could lead to an increment of predicted distresses, such as longitudinal cracking, using PavementME by more than 400% of its design limit.
Author: American Association of State Highway and Transportation Officials Publisher: AASHTO ISBN: 156051423X Category : Pavements Languages : en Pages : 218
Author: National Research Council (U.S.). Transportation Research Board Publisher: Transportation Research Board ISBN: 9780309048613 Category : Technology & Engineering Languages : en Pages : 196
Author: E. Eustacchio Publisher: CRC Press ISBN: 1482267519 Category : Architecture Languages : en Pages : 672
Book Description
This book forms the Proceedings of an International RILEM Symposium, the fourth in the series, on Testing of Bituminous Mixes in Budapest, Hungary, October 1990. The aim of the Symposium is to promote tests for the characterization, design and quality control of bituminous mixes which combine the best features of traditional and modern approaches.
Author: Peter Lindelöf
Author: Peter Lindelöf
Author: Donald W. Christensen
Author: Gerald A. Huber
Author: 
Author: William Gartner
Author: Elvis Alexander Castillo Camarena
Author: Thomas William Kennedy
Author: American Association of State Highway and Transportation Officials
Author: National Research Council (U.S.). Transportation Research Board
Author: E. Eustacchio