Evaluation Of Short Term Aging Effect Of Hot Mix Asphalt Due To Elevated Temperatures And Extended Aging Time
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Evaluation Of Short Term Aging Effect Of Hot Mix Asphalt Due To Elevated Temperatures And Extended Aging Time
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Author : Rubben Lolly
language : en
Publisher:
Release Date : 2013
Evaluation Of Short Term Aging Effect Of Hot Mix Asphalt Due To Elevated Temperatures And Extended Aging Time written by Rubben Lolly and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Binders (Materials) categories.
Heating of asphalt during production and construction causes the volatilization and oxidation of binders used in mixes. Volatilization and oxidation causes degradation of asphalt pavements by increasing the stiffness of the binders, increasing susceptibility to cracking and negatively affecting the functional and structural performance of the pavements. Degradation of asphalt binders by volatilization and oxidation due to high production temperature occur during early stages of pavement life and are known as Short Term Aging (STA). Elevated temperatures and increased exposure time to elevated temperatures causes increased STA of asphalt. The objective of this research was to investigate how elevated mixing temperatures and exposure time to elevated temperatures affect aging and stiffening of binders, thus influencing properties of the asphalt mixtures. The study was conducted in two stages. The first stage evaluated STA effect of asphalt binders. It involved aging two Performance Graded (PG) virgin asphalt binders, PG 76-16 and PG 64-22 at two different temperatures and durations, then measuring their viscosities. The second stage involved evaluating the effects of elevated STA temperature and time on properties of the asphalt mixtures. It involved STA of asphalt mixtures produced in the laboratory with the PG 64-22 binder at mixing temperatures elevated 25OF above standard practice; STA times at 2 and 4 hours longer than standard practices, and then compacted in a gyratory compactor. Dynamic modulus (E*) and Indirect Tensile Strength (IDT) were measured for the aged mixtures for each temperature and duration to determine the effect of different aging times and temperatures on the stiffness and fatigue properties of the aged asphalt mixtures. The binder test results showed that in all cases, there was increased viscosity. The results showed the highest increase in viscosity resulted from increased aging time. The results also indicated that PG 64-22 was more susceptible to elevated STA temperature and extended time than the PG 76-16 binders. The asphalt mixture test results confirmed the expected outcome that increasing the STA and mixing temperature by 25oF alters the stiffness of mixtures. Significant change in the dynamic modulus mostly occurred at four hour increase in STA time regardless of temperature.
Short Term Aging Of Hot Mix Asphalt
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Author : Timothy Aschenbrener
language : en
Publisher:
Release Date : 1994
Short Term Aging Of Hot Mix Asphalt written by Timothy Aschenbrener and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Pavements, Asphalt categories.
Evaluation Of Warm Mix Asphalt Technologies With Respect To Binder Aging And Emissions
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Author : Faramarz Farshidi
language : en
Publisher:
Release Date : 2012
Evaluation Of Warm Mix Asphalt Technologies With Respect To Binder Aging And Emissions written by Faramarz Farshidi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
In recent years Warm Mix Asphalt (WMA) technologies have been used to modify asphalt binders, with the following objectives: to decrease production and construction temperatures, reduce fumes and emissions, increase haul distance, and improve the workability of the mix. Reduced temperatures at the plant and during laydown and compaction are hypothesized to positively impact long-term oxidative aging behavior due to less oxidation/aging and result in less emissions during production and construction due to reduced production and construction temperatures. The purpose of this investigation was to quantify these improvements with respect to long-term oxidative aging in the field and environmental benefits with respect to volatile organic compounds, semi-volatile organic compounds and poly cyclic aromatic hydrocarbons in order to confirm or deny this hypothesis. This research evaluated the potential durability of WMA and Rubberized Warm Mix Asphalt (R-WMA) binders with respect to long-term aging through characterization of field-aged binders extracted and recovered from field cores. The results were compared to the control conventional Hot Mix Asphalt (HMA) and Rubberized Hot Mix Asphalt (R-HMA) samples. Binders were extracted and recovered from thirteen different test sections and a total of seven different WMA technologies were evaluated in this study. The Dynamic Shear Rheometer (DSR) was used to evaluate the rheological properties of the binders at high temperatures with respect to rutting performance in the field. The Bending Beam Rheometer (BBR) was used to characterize low temperature properties of the binder samples. A new testing procedure was developed to measure and characterize the rheological properties of the R-HMA and R-WMA binders with respect to performance-related properties in the field. The rheological results indicated that depending on the WMA technology used, the addition of WMA technologies and reduced production and compaction temperatures result in increase or decrease rutting resistance performance for WMA and R-WMA binders with respect to permanent deformation at high temperatures in the field. Both WMA and R-WMA binders studied meet the established thermal cracking criteria with respect to low temperature cracking in the field. The aging kinetics curves for WMA-treated binders are parallel to the control binders and the addition of WMA technologies including organic, chemical and mechanical foaming technologies studied in this research did not result in a different aging kinetics trend with respect to long-term aging in the field. A portable "flux" chamber was designed and fabricated to capture and directly measure emissions during paving operations. Emissions were collected in activated charcoal sorbent tubes for characterizing volatile organic compounds and semi-volatile organic compounds. XAD-2 resin tubes and filters were used to capture the gaseous phase and particulate phase of the PAH compounds, respectively. A reliable analytical method was developed to identify and quantify alkane emissions using gas chromatography mass spectrometry (GC/MS) in the laboratory. A separate method was developed for identification and characterization of trace level PAH compounds of the asphalt fumes. The results demonstrated that the warm mix asphalt technology type, plant mixing temperature and level of compaction significantly influence the emission characteristics throughout paving operations. Moreover, the emissions kinetics indicated that the majority of the reactive organic gases are volatilized in the first hour after sampling initiation (immediately after production and before compaction). To better understand and identify any chemical composition changes of the binder due to WMA technologies, nuclear magnetic resonance spectroscopy (NMR) was used for understanding structural complexities of HMA and WMA binder molecules. Qualitative analysis of both carbon and hydrogen atoms with HMA and WMA binders showed that the molecular structures of the binders are not significantly changed by the effect of WMA technologies.
Asphalt Paving Technology 2014
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Author : Eugene Skok
language : en
Publisher: DEStech Publications, Inc
Release Date : 2015-02-10
Asphalt Paving Technology 2014 written by Eugene Skok and has been published by DEStech Publications, Inc this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-02-10 with Technology & Engineering categories.
New developments in asphalt with bio-oil, rubber and polymer componentsEmpirical data and models on binders, aggregates, RAP, WMA, HMA for pavementSpecial section on asphalt paving research in IndiaFully-searchable text on CD-ROM (included) The latest volume of the AAPT series features over two dozen research presentations devoted to the chemistry, engineering, modeling and testing of asphalt materials and processing. Developments in the use of components like bio-oil are discussed, as are strategies for testing asphalt components for wear and durability at low and high temperatures. The book offers new data on the performance of reclaimed/recycled materials in asphalt paving. A special section focuses exclusively on discussions of binder modifications. The CD-ROM displays figures and illustrations in articles in full color along with a title screen and main menu screen. Each user can link to all papers from the Table of Contents and Author Index and also link to papers and front matter by using the global bookmarks which allow navigation of the entire CD-ROM from every article. Search features on the CD-ROM can be by full text including all key words, article title, author name, and session title. The CD-ROM has Autorun feature for Windows 2000 with Service Pack 4 or higher products along with the program for Adobe Acrobat Reader with Search 11.0. One year of technical support is included with your purchase of this product.
Summary Report On Aging Of Asphalt Aggregate Systems
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Author : Chris A. Bell
language : en
Publisher:
Release Date : 1989
Summary Report On Aging Of Asphalt Aggregate Systems written by Chris A. Bell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Aggregates (Building materials) categories.
This is a report on the state of the art of research on the phenomenon of the aging of asphalt-aggregate mixtures. Compared to research on the aging of asphalt cement, there has been little research on the aging of asphalt mixtures. Binder studies are considered as well as mixture sutdies, the relationship between laboratory aging tests and field performance, and the relationship between chemical composition and field performance. Recommendations are made for aging procedures which show promise for laboratory investigation. Test methods to evaluate aging are also considered. It is noted that extended heating procedures show the most promise for short-term aging and pressure oxidation and/or extended heating the most promise for long-term aging.
Performance Evaluation Of Warm Mix Recycled Asphalt Binders After Long Term Aging
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Author : Qiang Li
language : en
Publisher:
Release Date : 2019
Performance Evaluation Of Warm Mix Recycled Asphalt Binders After Long Term Aging written by Qiang Li 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 emulsion mixtures categories.
This study evaluates the pavement performance evolution of warm-mix recycled asphalt binders during the secondary service period. Warm-mix recycled asphalt binders with various long-term aging levels and recycling plans were produced by the laboratory simulation method. Conventional physical properties tests, the dynamic shear rheometer test, and the bending beam rheometer test were conducted to measure the performance of recycled binders. Effects of the aging level and recycling plan on the resistance to rutting, fatigue cracking, and low temperature cracking were investigated by statistical methods. It was found that after secondary long-term aging, recycled binders are more resistant to rutting, while they are less resistant to fatigue and low temperature cracking. The modified aging kinetic model can be used to accurately characterize the effect of secondary aging time on rutting or fatigue factors for recycled binders. The resistance of aged binders to fatigue and low temperature cracking is obviously improved by adding the warm mix asphalt additive. By comparison, using styrene butadiene rubber latex enhances the binder performance in almost all aspects. The aging level has a more significant effect than the recycling plan for all performance parameters.
Proceedings Of The Tms Middle East Mediterranean Materials Congress On Energy And Infrastructure Systems Mema 2015
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Author : Ibrahim Karaman
language : en
Publisher: Springer
Release Date : 2016-12-06
Proceedings Of The Tms Middle East Mediterranean Materials Congress On Energy And Infrastructure Systems Mema 2015 written by Ibrahim Karaman and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-12-06 with Technology & Engineering categories.
This is a collection of papers presented at The TMS Middle East - Mediterranean Materials Congress on Energy and Infrastructure Systems (MEMA 2015), a conference organized by The Minerals, Metals & Materials Society (TMS) and held in Doha, Qatar. The event focused on new materials research and development in applications of interest for Qatar and the entire Middle East and Mediterranean region. The papers in this collection are divided into five sections: (1) Sustainable Infrastructure Materials; (2) Computational Materials Design; (3) Materials for Energy Conversion and Storage; (4) Lightweight and High Performance Materials; and (5) Materials for Energy Extraction and Storage: Shape Memory Alloys.
Superpave Mix Design
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Author : Asphalt Institute
language : en
Publisher:
Release Date : 2001-01-01
Superpave Mix Design written by Asphalt Institute and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-01-01 with Asphalt categories.
Effects Of Short Term Oven Aging On Volumetrics And Selection Of N Design
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Author : Bradley J. McMullen
language : en
Publisher:
Release Date : 2000
Effects Of Short Term Oven Aging On Volumetrics And Selection Of N Design written by Bradley J. McMullen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Pavements, Asphalt categories.
This report presents findings on the effect of conditioning time on the volumetric properties of Superpave Gyratory Compactor (SGC) prepared asphalt mixtures. Field mixtures were sampled from the producing plants and then recreated in the laboratory following 3 different short-term conditioning procedures to measure the effect on the N-design value of the mixture. The projects selected represent three different N-design levels, have different nominal maximum aggregate size, aggregate sources, and asphalt binder types. Bulk Specific Gravity (Gmb) samples were aged at compaction temperature for 1-hr, 2-hr, and 4-hr. Maximum Specific Gravity (Gmm) samples were also aged at compaction temperature for 0-hr, 2-hr, and 4-hr. The short-term aging times are based off of Illinois Department of Transportation aging procedures, current National Center for Asphalt Technology recommendations, and the original Superpave conditioning specifications. It was observed in this study that increased conditioning time has a greater impact on the volumetric properties of polymer-modified binder mixes than on neat binder mixes. Also, noticed is that the presence of polymers in the binder appears to have greater effect than the higher temperatures used for conditioning polymer-modified HMA.
Rilem 252 Cmb Symposium
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Author : Lily D. Poulikakos
language : en
Publisher: Springer
Release Date : 2018-09-12
Rilem 252 Cmb Symposium written by Lily D. Poulikakos and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-09-12 with Technology & Engineering categories.
This volume contains the Proceedings of the RILEM TC 252-CMB International Symposium on the Chemo-Mechanical Characterization of Bituminous Materials. The Symposium was attended by researchers and practitioners from different fields presenting the latest findings in the chemical, mechanical, and microstructural characterization of bituminous materials. The book offers new and cutting edge papers on innovative techniques for the characterization of bituminous materials, gaining new insights into current issues such as effects of aging, moisture, and temperature.