Quantitative Analysis of Amine Based Liquid Antistrip Additive in Asphalt PDF Download
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Author: Robert Scott Cantrell
Publisher:
ISBN:
Category : Amines
Languages : en
Pages : 142
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Book Description
Author: Robert Scott Cantrell
Publisher:
ISBN:
Category : Amines
Languages : en
Pages : 142
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Author: Richard Ulrich
Publisher:
ISBN:
Category : Amine oxidase
Languages : en
Pages : 0
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Author:
Publisher:
ISBN:
Category : Amine oxidase
Languages : en
Pages : 150
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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.
Author: Nazimuddin M. Wasiuddin
Publisher:
ISBN:
Category : Acids
Languages : en
Pages : 8
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Book Description
In this study, thermal degradation of amine-based liquid anti-strip additives was evaluated due to RTFO-aging and PAV-aging according to AASHTO T 240 and AASHTO R 28 test methods, respectively. The surface free energy (SFE) characteristics of asphalt binders before and after aging were used as a tool for this evaluation. Two asphalt binders, namely PG 64-22 and PG 70-28, and two anti-strip additives, namely AD-Here HP Plus and Redicote E-6, were evaluated. It was observed for 0.75 % AD-Here HP Plus in PG 64-22, mixing at 163°C is more effective than mixing at 145°C with respect to increase in SFE. Also, both RTFO and PAV-aging decrease the total SFE of asphalt binders; both the aging processes are more effective in PG 64-22. In addition, the beneficial effect of anti-strip additives in acid-base characteristics of asphalt binders is severely reduced by RTFO and PAV-aging. Finally, the chemical model of asphalt binder, proposed by Wasiuddin , was expanded to include the SFE characteristics of asphalt binders due to aging.
Author: H.H. Yoon
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: John Donbavand
Publisher:
ISBN:
Category : Adhesion
Languages : en
Pages : 40
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Author: Richard K. Ulrich
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 0
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Book Description
The purpose of this project is to further develop quantitative tests for determining the concentration of antistrip additives in asphalt and to attempt to make these proposed tests applicable to intact pavement samples. After performing an extensive literature review of possible methods for this purpose, the authors chose two: organic phase titration for the determination of amine-based additives and atomic absorption spectroscopy for the determination of powdered lime additives. In the organic phase titration, the concentration of basic groups in the asphalt-additive mixture, or basicity, is determined and is assumed to be proportional to the concentration of additive in the sample. Also, an organic phase titration implies that the titration is carried out in a non-aqueous environment, therefore eliminating an aqueous extraction step, which could be a source of error and complication. This measured absorption is proportional to the concentration of the substance to be determined; calcium in this case, since this method will be used for lime-based additives and lime is by definition calcium hydroxide.
Author: G. W. Maupin
Publisher:
ISBN:
Category : Asphalt concrete
Languages : en
Pages : 24
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Book Description
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.
Author: C. Chen
Publisher:
ISBN:
Category : Antistrip additive
Languages : en
Pages : 6
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Book Description
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.
