Evaluation Of Moisture Susceptibility Of Warm Mix Asphalt
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Evaluation Of Moisture Susceptibility Of Warm Mix Asphalt
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Author : Maria Lorena Garcia Cucalon
language : en
Publisher:
Release Date : 2013
Evaluation Of Moisture Susceptibility Of Warm Mix Asphalt written by Maria Lorena Garcia Cucalon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Economic, environmental and engineering benefits promote the rapid implementation of WMA technologies. However, concerns remain based on changes in the production process that may lead to moisture susceptibility in the early life as compared to HMA. To evaluate WMA moisture susceptibility during this critical period, standard laboratory tests were used for three field projects each with an HMA control mixtures and multiple WMA mixtures. Different specimen types were also evaluated to capture differences in mix design, quality control/quality assurance, and field performance. Specimens were evaluated for moisture susceptibility by Indirect Tensile (IDT) Strength, Resilient Modulus (MR) and Hamburg Wheel-Track Testing (HWTT). Specimens for IDT and MR were tested dry and then tested wet after conditioning as described in AASHTO T283 with one freeze-thaw cycle. HWTT was used to assess both moisture susceptibility and rutting potential under repeated loads in the presence of water at elevated temperatures (i.e., 122°F [50°C]), and the output parameters used for evaluation were the calculated Stripping Inflection Point (SIP) and the rut depth at 5000 load cycles. Based on the results of the laboratory tests performed on PMFC cores acquired at construction and with time, WMA during its early life exhibited inferior moisture resistance when compared to HMA. However, with time, specifically after one summer, the dry and wet properties of WMA became equivalent to those of HMA. For WMA constructed in the fall, the results from this study suggest that the inclusion of recycled asphalt pavement (RAP) or an anti-stripping agent may alleviate possible moisture susceptibility issues in the early life during wet, winter weather conditions. While some laboratory test results demonstrated that WMA is more moisture susceptible than HMA, field performance reported to date from the three projects used in this study shows no evidence of moisture damage. Therefore the search for a laboratory test to screen mixtures for moisture susceptibility continues. An alternative approach, applying Griffith crack growth theory and utilizing IDT, MR and air voids% the adhesive bond energy of asphalt mixtures was calculated for Texas field project. This value holds promise for characterizing performance of asphalt mixtures by considering basic properties and grouping into one representative value. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/149392
Evaluation Of Moisture Damage In Warm Mix Asphalt Containing Recycled Asphalt Pavement
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Author : Emily Dawn Shrum
language : en
Publisher:
Release Date : 2010
Evaluation Of Moisture Damage In Warm Mix Asphalt Containing Recycled Asphalt Pavement written by Emily Dawn Shrum 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.
Warm mix asphalt (WMA) has been used worldwide for many years, primarily in Europe. The National Asphalt Pavement Association first brought WMA to the United States in 2002. By using warm mix technology, the temperature of an asphalt mixture during production, transportation, and compaction decreases dramatically. Several concerns about WMA arise due to the reduced mixing temperature. One of the primary concerns in asphalt pavement is the moisture damage. The lower mixing temperature may not be high enough to vaporize all the moisture absorbed in the aggregate, and part of the moisture may be entrapped in the pavements during compaction. This thesis presents a laboratory study to evaluate the moisture susceptibility of warm mix asphalt (WMA) produced through plant foaming procedure. Two types of mixtures were evaluated. A base mixture meeting the state of Tennessee "BM-2" mix criteria was evaluated at 0, 30, 40, and 50 percent fractionated recycled asphalt pavement (RAP), and a surface mixture meeting the state of Tennessee "411-D" mix criteria was evaluated at 15, 20, 30, 40 percent fractionated RAP. WMA mixture specimens were obtained and compacted at the asphalt plant. The WMA specimens were compared to hot-mix asphalt (HMA) specimens through a set of laboratory mixture performance tests. In addition to traditional AASHTO T283 freeze and thaw (F-T) tensile strength ratio (TSR), Superpave indirect tensile test (IDT) with F-T and MIST conditioning, and Asphalt Pavement Analyzer (APA) Hamburg wheel tracking tests were utilized to evaluate asphalt mixtures. Moisture tests indicated that with the higher inclusions of RAP, specimens exhibited lower rut depths and higher tensile strength retention. Tensile strength ratio tests indicated that HMA specimens had higher tensile strength retention when freeze thaw conditioned. Dynamic modulus conditioned specimens indicated that simple performance tests can show the difference between conditioned and unconditioned specimens. HMA specimens showed lower susceptibility to moisture compared to WMA specimens for both BM-2 and 411-D mixtures. The higher percentages of RAP in WMA and HMA in both BM-2 and 411-D mixtures showed a reduction to moisture susceptibility.
Evaluation Of The Moisture Susceptibility Of Wma Technologies
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Author : Amy Epps Martin
language : en
Publisher: Transportation Research Board
Release Date : 2014
Evaluation Of The Moisture Susceptibility Of Wma Technologies written by Amy Epps Martin and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Technology & Engineering categories.
"TRB's National Cooperative Highway Research Program (NCHRP) Report 763: Evaluation of the Moisture Susceptibility of WMA Technologies presents proposed guidelines for identifying potential moisture susceptibility in warm mix asphalt (WMA). The report also suggests potential revisions to the Appendix to AASHTO R 35, "Special Mixture Design Considerations and Methods for WMA" as a means to implement the guidelines."--publisher's description
Laboratory Evaluation Of Workability And Moisture Susceptibility Of Warm Mix Asphalt Technologies With Reclaimed Asphalt Pavement Material
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Author : Abhilash Kusam
language : en
Publisher:
Release Date : 2014
Laboratory Evaluation Of Workability And Moisture Susceptibility Of Warm Mix Asphalt Technologies With Reclaimed Asphalt Pavement Material written by Abhilash Kusam 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.
Validation Of Guidelines For Evaluating The Moisture Susceptibility Of Wma Technologies
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Author : Amy Epps Martin
language : en
Publisher:
Release Date : 2016
Validation Of Guidelines For Evaluating The Moisture Susceptibility Of Wma Technologies written by Amy Epps Martin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Pavements, Asphalt concrete categories.
TRB's National Cooperative Highway Research Program (NCHRP) Report 817: Validation of Guidelines for Evaluating the Moisture Susceptibility of WMA Technologies presents validated guidelines proposed for identifying potential moisture susceptibility in warm mix asphalt (WMA) during mix design. The report further corroborates the moisture susceptibility thresholds described in NCHRP Report 763: Evaluation of the Moisture Susceptibility of WMA Technologies.
Performance Based Moisture Susceptibility Evaluation Of Warm Mix Asphalt Concretes Through Laboratory Tests And Digital Imaging Analyses
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Author : Jong-Sub Lee
language : en
Publisher:
Release Date : 2014
Performance Based Moisture Susceptibility Evaluation Of Warm Mix Asphalt Concretes Through Laboratory Tests And Digital Imaging Analyses written by Jong-Sub Lee 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.
Evaluation Of Hot Mix Asphalt Moisture Sensitivity Using The Nottingham Asphalt Test Equipment
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Author : Sunghwan Kim
language : en
Publisher:
Release Date : 2005
Evaluation Of Hot Mix Asphalt Moisture Sensitivity Using The Nottingham Asphalt Test Equipment written by Sunghwan Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Pavements, Asphalt categories.
Even though moisture sensitivity of Hot Mix Asphalt (HMA) mixtures has been recognized as a major form of distress in asphalt concrete pavements since the advent of asphalt paving technology, the mechanism of this problem has not been clearly identified until now. However, it has been agreed that it can be characterized by the loss of adhesive bond between the asphalt binder and the aggregate or by a softening of the cohesive bonds within the asphalt binder, both of which are due to the action of loading under traffic in the presence of moisture. The evaluation of Hot Mix Asphalt moisture sensitivity has been divided into two categories: visual inspection test and mechanical test. However, most of them have been developed in pre-Superpave mix design. This research was conducted to develop a new test protocol which can overcome the problems of the current procedures and to evaluate the possibility of using the Nottingham Asphalt Tester (NAT) in the resulting procedure.
Evaluation Of Hot Mix Asphalt Moisture Sensitivity Using The Nottingham Asphalt Test Equipment
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Author : R. Christopher Williams
language : en
Publisher:
Release Date : 2010
Evaluation Of Hot Mix Asphalt Moisture Sensitivity Using The Nottingham Asphalt Test Equipment written by R. Christopher Williams and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Pavements, Asphalt categories.
Pavements are subjected to different stresses during their design lives. A properly designed pavement will perform adequately during its design life, and the distresses will not exceed the allowable limits; however, there are several factors that can lead to premature pavement failure. One such factor is moisture sensitivity. AASHTO T 283 is the standard test used in the moisture susceptibility evaluation of asphalt mixtures, but the results of the test are not very representative of the expected behavior of asphalt mixtures. The dynamic modulus test measures a fundamental property of the mixture. The results of the dynamic modulus test can be used directly in the Mechanistic-Empirical Pavement Design Guide (MEPDG) and are considered a very good representation of the expected field performance of the mixture. Further research is still needed to study how the dynamic modulus results are affected by moisture. The flow number test was studied in previous research as a candidate test for moisture-susceptibility evaluation, but the results of that research were not favorable. This research has four main objectives. The first objective of this research is to evaluate the usefulness of the dynamic modulus and flow number tests in moisture-susceptibility evaluation. The second objective is to compare the results to those achieved using the AASHTO T 283 test. The third objective is to study the effect of different methods of sample conditioning and testing conditions. The fourth objective of the research is to study the variability in the test results.
Mechanistic Evaluation Of The Effect Of Wma Additives On Wettability And Moisture Susceptibility Properties Of Asphalt Mixes
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Author : Rouzbeh Ghabchi
language : en
Publisher:
Release Date : 2013
Mechanistic Evaluation Of The Effect Of Wma Additives On Wettability And Moisture Susceptibility Properties Of Asphalt Mixes written by Rouzbeh Ghabchi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Mix design categories.
This study used a mechanistic framework (i.e., surface free energy) to evaluate the moisture susceptibility of warm mix asphalt (WMA) with three different WMA additives, namely, Sasobit, Advera, and Evotherm. The surface free energy (SFE) components of modified PG64-22 asphalt binder with different percentages of WMA additives and selected aggregates were measured in the laboratory. The wettability, the work of adhesion, the work of debonding, and energy ratios were estimated in order to assess the moisture-induced damage potential of combinations of modified asphalt binders and different aggregates. The results indicate that Sasobit and Advera are able to reduce the moisture susceptibility potential of the mixes, but their use is not recommended with highly acidic aggregates such as granite. Evotherm resulted in the highest increases in wettability, total surface free energy, and increased work of adhesion and a reduction in the work of debonding, resulting in a better possible aggregate coating with asphalt binder and lower moisture susceptibility with all types of tested aggregates relative to those of other WMA additives. Furthermore, tensile strength ratio (TSR) tests were conducted on Advera and Evotherm-modified and neat (unmodified) asphalt mixes, and the results were compared with those from the SFE test. It was found that the SFE approach is a better indicator of moisture susceptibility than the traditional TSR test. The findings of the present study would help the highway engineers and agencies to better understand the moisture damage potential of flexible pavements constructed with WMA technologies.
Validation Of Guidelines For Evaluating The Moisture Susceptibility Of Wma Technologies
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Author : Amy Epps Martin
language : en
Publisher:
Release Date : 2016
Validation Of Guidelines For Evaluating The Moisture Susceptibility Of Wma Technologies written by Amy Epps Martin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Pavements, Asphalt categories.
TRB's National Cooperative Highway Research Program (NCHRP) Report 817: Validation of Guidelines for Evaluating the Moisture Susceptibility of WMA Technologies presents validated guidelines proposed for identifying potential moisture susceptibility in warm mix asphalt (WMA) during mix design. The report further corroborates the moisture susceptibility thresholds described in NCHRP Report 763: Evaluation of the Moisture Susceptibility of WMA Technologies.