Investigation Of The Fracture Resistance Of Asphalt Mixtures At Low Temperatures With A Semi Circular Bend Scb Test
DOWNLOAD
Download Investigation Of The Fracture Resistance Of Asphalt Mixtures At Low Temperatures With A Semi Circular Bend Scb Test PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Investigation Of The Fracture Resistance Of Asphalt Mixtures At Low Temperatures With A Semi Circular Bend Scb Test book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Investigation Of The Fracture Resistance Of Asphalt Mixtures At Low Temperatures With A Semi Circular Bend Scb Test
DOWNLOAD
Author : Xue Li
language : en
Publisher:
Release Date : 2005
Investigation Of The Fracture Resistance Of Asphalt Mixtures At Low Temperatures With A Semi Circular Bend Scb Test written by Xue Li 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.
Development Of Semi Circular Bending Scb Fracture Test For Bituminous Mixtures
DOWNLOAD
Author : Gabriel Nsengiyumva
language : en
Publisher:
Release Date : 2015
Development Of Semi Circular Bending Scb Fracture Test For Bituminous Mixtures written by Gabriel Nsengiyumva and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Pavements, Asphalt concrete categories.
Granted that most distresses in asphalt (flexible) concrete (AC) pavements are directly related to fracture, it becomes clear that identifying and characterizing fracture properties of AC mixtures is a critical step towards a better pavement design. This thesis examines the testing variables of a reliable and practical semicircular bending (SCB) test for evaluating the fracture characteristics of asphalt concrete mixtures at intermediate service temperature conditions. The first part of this thesis investigates the repeatability of the SCB fracture test method by integrating a statistical-experimental approach to identify testing variables of the SCB test that result in repeatable test results. Toward this end, five testing variables (the number of testing specimens, specimen thickness, notch length, loading rate, and testing temperature) of the SCB test were investigated due to their significant effects on mixture fracture characteristics. After statistical analysis of 18 specimens tested a typical testing variables, approximately, five to six specimens/replicates were found to be a reasonable sample size that could properly represent asphalt concrete fracture behavior using the SCB test method. The coefficient of variation (COV) of the mixture fracture energy was used to evaluate the effect of each variable on the repeatability of test results. A range of 1 mm/min. to 5 mm/min. for the loading rate, a notch length from 5 mm to 25 mm, and a specimen thickness of 40 mm to 60 mm and a testing temperature of 15-40°C showed the lowest variation of fracture energy. The second part of this work is to investigate the sensitivity of the SCB test using the previously determined testing variables. Fourteen different asphalt concrete (AC) mixtures collected from 12 field construction projects in Nebraska were used in this task. The ANOVA test showed statistically significant differences between mixtures at a 95% confidence level. Tukey's HSD multiple-comparison analysis found similarities within mixtures of same types and significant difference between mixtures types. In addition, the fracture energy of bituminous mixtures increased with increasing amount of virgin asphalt content in mixture. Overall, the SCB test method developed herein proved to be repeatable and sensitive to changes in mixtures, and thus a promising tool for evaluating the fatigue fracture resistance of AC mixtures.
Evaluation Of The Factors That Affect The Fracture Resistance Of Asphalt Mixtures At Low Temperatures Using Mechanical Testing And Acoustic Emission Methods
DOWNLOAD
Author : Xinjun Li
language : en
Publisher:
Release Date : 2006
Evaluation Of The Factors That Affect The Fracture Resistance Of Asphalt Mixtures At Low Temperatures Using Mechanical Testing And Acoustic Emission Methods written by Xinjun Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Investigation Of Cracking Resistance Of Asphalt Mixtures And Binders
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2019
Investigation Of Cracking Resistance Of Asphalt Mixtures And Binders written by 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.
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.
Fracture Resistance Characterization Of Superpave Mixtures Using The Semi Circular Bending Test
DOWNLOAD
Author : Z. Wu
language : en
Publisher:
Release Date : 2005
Fracture Resistance Characterization Of Superpave Mixtures Using The Semi Circular Bending Test written by Z. Wu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Energy release rate categories.
The fracture resistance of asphalt mixture is an important property directly related to pavement distresses, such as cracking. This paper reports the investigation of a newly-developed semicircular bending (SCB) test as a candidate test for the fracture resistance characterization of asphalt mixtures. Thirteen Superpave mixtures, designed with four different binder types (AC-30, PAC-40, PG70-22M, and PG76-22M) and four different compaction levels (Ndesign = 75, 97, 109, and 125), were considered in this study. The SCB tests were conducted at 25°C using a three-point bending fixture in a MTS testing system. The fracture resistance was analyzed based on an elasto-plastic fracture mechanics concept of critical strain energy release rate, also called the critical value of J-integral (Jc). Preliminary results indicate that the JC values were fairly sensitive to changes in binder type and nominal maximum aggregate size (NMAS) used in Superpave mixtures. This study suggests that the SCB test could be a valuable correlative tool in the evaluation of fracture resistance of asphalt mixtures.
Evaluation Of The Low Temperature Fracture Resistance Of Asphalt Mixtures Using The Semi Circular Bend Test
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2004
Evaluation Of The Low Temperature Fracture Resistance Of Asphalt Mixtures Using The Semi Circular Bend Test written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Use Of Semi Circular Bend Test To Characterize Fracture Properties Of Asphalt Concrete With Virgin And Recycled Materials
DOWNLOAD
Author : Xuan Chen
language : en
Publisher:
Release Date : 2019
Use Of Semi Circular Bend Test To Characterize Fracture Properties Of Asphalt Concrete With Virgin And Recycled Materials written by Xuan Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Cracking in asphalt pavements is a challenging problem and has been the subject of numerous research studies for decades. To properly address this problem, suitable tests must be conducted to capture material behavior in cracking, such testing must be accompanied by proper mechanistic and empirical modeling of the material behavior in cracking. For mixture design and material quality control/assurance purposes, there is not a commonly accepted protocol for testing asphalt mixtures for cracking resistance characterization, due to variability of test results, non-uniformity in test specimens, and overall complexities of the tests that prevent them from being adopted for daily uses. On the other hands, for the tests that are popular for research purposes, the validity and sensitivity of such tests have not been fully witnessed and proven, due to lack of data quantity. Addressing these problems will help improve mixture design procedures and advance quality control and quality assurance of asphalt mixes, especially when complicated components, such as recycled materials and performance enhancing additives, are commonly incorporated into asphalt concrete nowadays. The overall goal of this research is to characterize the cracking resistance of various types of asphalt concrete mixes via a suitable candidate test. An additional goal is to provide guidelines for performing balanced mixture design on asphalt concrete with virgin and recycled materials when using such a test. Throughout the research, the selected fracture test, namely the semi-circular bend (SCB) fracture test, was first evaluated by investigating the sensitivity of performance indicators under various test conditions and proposing the most appropriate test conditions using a solid theoretical background. Then, the test was used to study fracture behavior of a wide range of asphalt paving materials including, but not limited to, various virgin asphalt mixes, crumb rubber modified (CRM) asphalt mixes, asphalt mixes with recycled materials such as reclaimed asphalt pavement (RAP), and recycled asphalt shingles (RAS), together with asphalt mixes with recycling agents. Not only were these mixtures prepared in a single laboratory, specimens received from different laboratories and plants were also included in the test matrix to reduce bias and to investigate the variation of the performance indicators. Additionally, a method to conduct the performance-based balanced-design using only the SCB fracture test was explored. Finally, the effect of long-term aging on fracture behavior of asphalt mixes was investigated, in order to build foundations for performance prediction commonly used in asphalt pavement design procedures. The main contributions of this study are: 1) verification of the sensitivity of the SCB test using asphalt mixtures with controlled variables under the proposed test conditions that are suitable to the commonwealth of Pennsylvania, 2) investigation of the impacts of material variables and conditioning, namely aging process, on fracture behavior of asphalt concretes, 3) exploration of possibility of performing balanced mixture design on asphalt concrete using the SCB test as a stand-alone test. The SCB fracture test procedure is found to be suitable to qualify asphalt mixes to fulfill different traffic demands and pavement structural conditions. Reliable mix design and quality assurance of asphalt pavements with complicated rehabilitation histories and sophisticated material compositions can be performed with confidence using such a test.
Pro 37 5th International Rilem Conference On Cracking In Pavements Mitigation Risk Assessment And Prevention
DOWNLOAD
Author : C. Petit
language : en
Publisher: RILEM Publications
Release Date : 2004
Pro 37 5th International Rilem Conference On Cracking In Pavements Mitigation Risk Assessment And Prevention written by C. Petit and has been published by RILEM Publications this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Pavements categories.
Development Of A Semicircular Bend Scb Test Method For Performance Testing Of Nebraska Asphalt Mixtures
DOWNLOAD
Author : Gabriel Nsengiyumva
language : en
Publisher:
Release Date : 2015
Development Of A Semicircular Bend Scb Test Method For Performance Testing Of Nebraska Asphalt Mixtures written by Gabriel Nsengiyumva and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Pavements, Asphalt categories.
"Granted that most distresses in asphalt (flexible) concrete (AC) pavements are directly related to fracture, it becomes clear that identifying and characterizing fracture properties of AC mixtures is a critical step towards a better pavement design. This report examines the testing variables of a reliable and practical semicircular bending (SCB) test for evaluating the fracture characteristics of asphalt concrete mixtures at intermediate service temperature conditions. The first part of this report investigates the repeatability of the SCB frature test method by integrating a statistical-experimental approach to identify testing variables of the SCB test that result in repeatable test results. . . . The second part of this work is to investigate the sensitivity of the SCB test using the previously determined testing variables. Fourteen different asphalt concrete (AC) mixtures collected from 12 field construction projects in Nebraska were used in this task. . . . Overall, the SCB test method developed herein proved to be repeatable and sensitive to changes in mixtures, and thus a promising tool for evaluating the fatigue fracture resistance of AC mixtures" (page ii).
Fracture Behavior Of Asphalt Materials
DOWNLOAD
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.