Investigation of the Low-temperature Fracture Properties of Three MnROAD Asphalt Mixtures
Investigation of the Low-temperature Fracture Properties of Three MnROAD Asphalt Mixtures

Author: Xinjun Li

Publisher:

Published: 2006

Total Pages: 63

ISBN-13:

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In this research effort, field cores were taken from cells 33, 34 and 35 at the MnROAD facility to determine the fracture properties of the field mixtures, to compare them with the laboratory-prepared mixtures analyzed in a previous study, and to evaluate the effect of aging at different depths in the asphalt layer. In addition, the properties of the recovered binders from the field cores as well as the properties of the original binders aged in laboratory conditions were investigated. The test results and the analyses performed indicate that the fracture tests performed on asphalt binders and asphalt mixtures have the potential to predict the field performance of asphalt pavements with respect to thermal cracking. The binder results confirm the predictions of the current performance grading system; however, it appears that the fracture resistance of the PG-34 asphalt mixture is better than the fracture resistance of the PG-40 mixtures, which is the opposite of what the PG system predicts.

Investigation of Cracking Resistance of Asphalt Mixtures and Binders
Investigation of Cracking Resistance of Asphalt Mixtures and Binders

Author:

Publisher:

Published: 2019

Total Pages: 94

ISBN-13:

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In this study, the viability of using three test methods for asphalt mixtures and one test method for asphalt binders are investigated. These test methods are: Bending Beam Rheometer (BBR) for creep and strength of asphalt mixtures; low temperature Semi Circular Bend (SCB) test for fracture energy of asphalt mixtures; Dynamic Modulus (E*) test of asphalt mixtures using the Indirect Tensile Test (IDT) configuration; and BBR strength test of asphalt binders. The materials used in the experimental work were used in MnROAD cells constructed in the summer of 2016 as part of the MnROAD Cracking Group (CG) experiment, a 3-year pooled-fund project. The results show that the testing methods investigated provide repeatable results that follow trends similar to the one observed using traditional methods. The results also show that the properties are highly temperature dependent and the ranking observed at one temperature can change at a different temperature. In addition, it is observed that materials with similar rheological properties, such as complex modulus absolute value E*, creep stiffness S, and m-value, do not necessarily have the same fracture resistance. These results confirm one more time the need for a fracture/strength test for correctly evaluating cracking resistance of asphalt materials.

Asphalt Mixture and Binder Fracture Testing for 2008 MnROAD Construction
Asphalt Mixture and Binder Fracture Testing for 2008 MnROAD Construction

Author: Mihai Marasteanu

Publisher:

Published: 2009

Total Pages: 32

ISBN-13:

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This report summarizes the results of an experimental effort to characterize the low-temperature behavior of asphalt mixtures and binders from the recently reconstructed cells at the MnROAD facility. In depth analysis of the data was not part of this study; this will be accomplished in several concurrent research projects.

Investigation of Low Temperature Cracking in Asphalt Pavements
Investigation of Low Temperature Cracking in Asphalt Pavements

Author: Mihai O. Marasteanu

Publisher:

Published: 2012

Total Pages: 377

ISBN-13:

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The work detailed in this report represents a continuation of the research performed in phase one of this national pooled fund study. A number of significant contributions were made in phase two of this comprehensive research effort. Two fracture testing methods are proposed and specifications are developed for selecting mixtures based on fracture energy criteria. A draft SCB specification, that received approval by the ETG and has been taken to AASHTO committee of materials, is included in the report. In addition, alternative methods are proposed to obtain mixture creep compliance needed to calculate thermal stresses. Dilatometric measurements performed on asphalt mixtures are used to more accurately predict thermal stresses, and physical hardening effects are evaluated and an improved model is proposed to take these effects into account. In addition, two methods for obtaining asphalt binder fracture properties are summarized and discussed. A new thermal cracking model, called "ILLI-TC," is developed and validated. This model represents a significant step forward in accurately quantifying the cracking mechanism in pavements, compared to the existing TCMODEL. A comprehensive evaluation of the cyclic behavior of asphalt mixtures is presented, that may hold the key to developing cracking resistant mixtures under multiple cycles of temperature.

Fracture Behavior of Asphalt Materials
Fracture Behavior of Asphalt Materials

Author: Sadjad Pirmohammad

Publisher: Springer Nature

Published: 2020-02-18

Total Pages: 229

ISBN-13: 3030399745

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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.

The Technical Communication Handbook
The Technical Communication Handbook

Author: Laura J. Gurak

Publisher: Longman Publishing Group

Published: 2009

Total Pages: 660

ISBN-13:

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The Technical Communication Handbook, a life-long companion for technical communicators, is a comprehensive reference guidefor technical communication students at all levels, as well as by practicing technical communicators and others writing in the technical workplace. The handbook boasts a full-color design, extensively annotated model documents, and coverage of current topics in intellectual property, digital communication, collaboration, and accessibility issues.

Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt
Investigation of Low Temperature Thermal Cracking in Hot Mix Asphalt

Author: Timothy Aschenbrener

Publisher:

Published: 1995

Total Pages: 98

ISBN-13:

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A study was performed to determine the influence of material properties on the thermal cracking performance of hot mix asphalt (HMA), and to determine the ability to predict thermal cracking from pavements of known field performance. The testing device used to measure the HMA properties was the thermal-stress, restrained-specimen test (TSRST), and the device used to measure the binder properties was the bending beam rheometer (BBR). The laboratory study was conducted to determine the variability of test results as an influence of 1) asphalt cement stiffness, 2) asphalt cement quantity, 3) mixes with various aggregate qualities, 4) aging, and 5) the presence of hydrated lime. The influence of the asphalt cement stiffness was the single largest factor that controlled the test results.