Quantify Antitrip Additives In Asphalt Binders And Mixes
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Quantify Antitrip Additives In Asphalt Binders And Mixes
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Author :
language : en
Publisher:
Release Date : 2004
Quantify Antitrip Additives In Asphalt Binders And Mixes 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.
In this study, litmus and colorimetric tests were developed to quantify the contents of amine-based antistrip additives in asphalt binders and mixes. In addition, the effect of prolonged heating on antistrip additive content was evaluated for both asphalt binders and mixes. Results of this study indicate that both litmus and colorimetric tests are capable of detecting and quantifying amine-based antistrip additives in asphalt binders and mixes. Also, both test methods were able to validate the antistrip additive contents in field samples with known additive contents. When subjected to prolonged heating periods, the antistrip additive content decreased substantially for both asphalt binders and mixes. For asphalt binders, no antistrip additive content was detectable after 24 to 48 hours of extended heating; for mixes, the measured antistrip additive content approached non-detectable level after 6 to 12 hours of extended heating. Tensile Strength Ratio test was conducted in this research to evaluate the effect of prolonged heating on the asphalt-aggregate bond strength of hot mix asphalt (HMA) containing liquid antistrip additives. Improvement of moisture sensitivity by use of amine-based antistrip additive was observed to be lost to a great extent after prolonged heating. It shows that the remaining part of antistrip additive after prolonged heating has reduced effect on adhesion between asphalt and aggregate. The volatilization and⁄or chemical change that occur during the heating process of amine-based antistrip additive affect the improvement of asphalt-aggregate adhesion and ultimately the moisture susceptibility of mixes.
Quantify Antitrip Additives In Asphalt Binders And Mixes
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Author : Chun Chen
language : en
Publisher:
Release Date : 2007
Quantify Antitrip Additives In Asphalt Binders And Mixes written by Chun Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Keywords: litmus test, colorimetric test, prolonged heating, moisture sensitivity, antistrip additive.
A Procedure To Quantify Organic Antistrip Additives In Asphalt Binders And Mixes
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Author : C. Chen
language : en
Publisher:
Release Date : 2006
A Procedure To Quantify Organic Antistrip Additives In Asphalt Binders And Mixes written by C. Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Antistrip additive categories.
Stripping is a phenomenon of loss of bond or adhesion between the asphalt binder and the aggregate in asphalt mixes. Stripping frequently results from the presence of water, and most agencies require the use of antistrip additive to control moisture damage. However, there is no simple and quick method for detecting the presence and the amount or percentage of organic antistrip additive in asphalt binders or mixes. This paper presents a procedure based on solid-state spectrophotometry to detect qualitatively and quantitatively the presence of amine-based antistrip additive in asphalt binders and mixes. The developed procedure gives results that are quantifiable and reproducible with low coefficients of variation.
Quantifying Antistrip Additives In Asphalt Binder Mixes
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Author : Akhtarhusein Asgarali Tayebali
language : en
Publisher:
Release Date : 2005
Quantifying Antistrip Additives In Asphalt Binder Mixes written by Akhtarhusein Asgarali Tayebali and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Asphalt categories.
Quantitative Determination Of Asphalt Antistripping Additive
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Author : G. W. Maupin
language : en
Publisher:
Release Date : 2004
Quantitative Determination Of Asphalt Antistripping Additive written by G. W. Maupin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Asphalt concrete categories.
A small device (StripScan) has been developed by InstroTech, Inc., that uses litmus paper and a spectrophotometer to analyze vapors from hot liquid asphalt binders and mixtures to determine the percentage of antistripping additive present. Approximately 60 five-point additive content-color index count regressions were performed on binders and mixtures to determine how well the StripScan device measured additive content. The regressions basically fit the quadratic format that is used by the manufacturer in the recommended calibration process. The regressions were best when the litmus color index count was calculated by subtracting the initial count of the blank strip from the final count after exposure for the mixtures. Changes to the instrument software and testing temperature were necessary as the investigation progressed to accommodate different grades of binders. After the planned testing was completed, some retesting of the binders was performed using modified equipment and procedures. The changes appeared to improve the consistency of the results; therefore, the author believes that additive content in binders can be determined within +0.2 percent 95 percent of the time using the modified equipment and procedures. Test results for mixtures were less accurate than for binders; however, if the vapor trap is modified as described, the accuracy for mixtures should be improved substantially. Since the test can be performed quickly, multiple tests on a sample are possible. This would increase the confidence of the test results. Additional research and development is recommended and necessary before the device can be used for quality assurance testing. An accuracy of +0.1 percent is a worthy goal.
Laboratory Evaluation Of Anti Strip Additives In Hot Mix Asphalt
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Author : Bradley J. Putnam
language : en
Publisher:
Release Date : 2006
Laboratory Evaluation Of Anti Strip Additives In Hot Mix Asphalt written by Bradley J. Putnam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Asphalt categories.
The use of hydrated lime or other liquid anti stripping agents (ASA) is the most common method to improve the moisture susceptibility of asphalt mixes. However, most laboratory test conditions used to evaluate the moisture susceptibility of the mixes are only for a short duration of time. This might not be a good representation of the field conditions (i.e., several months or years of service). Thus, a study to evaluate the effects of conditioning the mixes for longer durations was initiated. Also, another problem with the use of the liquid anti stripping agents is their heat storage stability. This report addresses these two issues, by preparing and testing mixtures made with fresh binder for indirect tensile strength after conditioning the samples for 1, 7, 28, 90 and 180 days, and samples prepared from binder stored for three days at 160° C after conditioning them for 1, 28 and 90 days. The results of this study indicated that hydrated lime and the liquid anti stripping agents were equally effective for the mixes used in this research when conditioned beyond one day. In the case of samples prepared from stored binder, there was no significant difference in the effectiveness of hydrated lime and the liquid anti stripping agents even after conditioning for one day. Though it was observed that none of the ASA treatments performed better than others in the case of samples prepared with stored binder, it was also observed that almost all mixes gave significantly similar wet ITS and TSR values as samples prepared from fresh binder.
Durability And Performance Characteristics Of Hot Mix Asphalt Containing Polymer Additives
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Author : Robert Y. Liang
language : en
Publisher:
Release Date : 2001
Durability And Performance Characteristics Of Hot Mix Asphalt Containing Polymer Additives written by Robert Y. Liang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Pavements, Asphalt concrete categories.
Ohio Department of Transportation has adopted the hot mix asphalt concrete containing polymer modifiers for use in the interstate highway pavement. Among the various reasons cited for the adoption of polymer modifiers are the favorable field experiences by ODOT, extensive literatures reporting enhanced performance, such as rutting resistance, low temperature thermal cracking resistance, and possibly fatigue endurance. However, despite these favorable findings, there are still cases involving premature failure of hot mixtures containing polymer modifiers. Concerns regarding optimum polymer content, compatibility between polymer additives and asphalt cement, proper mixing and compaction procedure remain to be resolved. Furthermore, performance based specifications to ensure production of desirable final asphalt concrete product require additional development. Questions regarding the suitability of Superpave binder testing procedures for the polymer-modified binders need to be clarified.
Test Methods To Quantify Cracking Resistance Of Asphalt Binders And Mixtures
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Author : David E. Newcomb
language : en
Publisher:
Release Date : 2021
Test Methods To Quantify Cracking Resistance Of Asphalt Binders And Mixtures written by David E. Newcomb and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Asphalt categories.
Evaluation Of Warm Mix Additives For Use In Modified Asphalt Mixtures
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Author : Corina Borroel Wong
language : en
Publisher:
Release Date : 2011
Evaluation Of Warm Mix Additives For Use In Modified Asphalt Mixtures written by Corina Borroel Wong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Thesis categories.
The intention of this research effort is to evaluate the use of warm mix additives with typical polymer-modified and terminal blend tire rubber asphalt mixtures from Nevada and California. The research effort is broken into three phases that are intended to evaluate the impacts of warm mix additives with typical polymer-modified and terminal blend tire rubber asphalt mixtures from Nevada and California: moisture damage, performance characteristics, and mechanistic analysis. In Phase I of this research effort, mixture resistance to moisture damage was evaluated using the indirect tensile test and the dynamic modulus at multiple freeze-thaw cycles. Laboratory testing was conducted to address the following: (1) the impact of warm mix additive and reduced production temperatures on the moisture damage resistance of asphalt mixtures, (2) the impact of residual aggregate moisture on the moisture damage resistance of WMA mixtures, (3) the impact of warm mix additives on the moisture damage resistance of anti-strip treated WMA mixtures, and (3) the impact of long-term aging on strength gain and the moisture damage resistance of WMA mixtures. A total of one aggregate source, four warm mix asphalt technologies (Advera, Sasobit, Revix and Foaming) and three asphalt binder types (neat, polymer-modified and terminal blend tire rubber modified asphalt binders) typically used in both Nevada and California are being evaluated in this study. This thesis will only summarize the test results and findings of the Phase I of the study for two warm-mix additives: Advera and Sasobit. The evaluation of the other two technologies (i.e. Revix and Foaming) as well as the Phase II testing are still in progress and have not been completed.
Quantification Of Quality Of Foamed Warm Mix Asphalt Binders And Mixtures
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Author : Hande Isik Ozturk
language : en
Publisher:
Release Date : 2013
Quantification Of Quality Of Foamed Warm Mix Asphalt Binders And Mixtures written by Hande Isik Ozturk and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Electronic dissertations categories.