Effect of prolonged heating on the Asphalt-Aggregate Bond Strength of HMA containing Liquid Anti-strip Additives

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dc.contributor.advisorAkhtarhusein A. Tayebali, Committee Chairen_US
dc.contributor.advisorDetlef Knappe, Committee Co-Chairen_US
dc.contributor.advisorN. Paul Khosla, Committee Memberen_US
dc.contributor.authorMandapaka, Venkata Lakshman Murthyen_US
dc.date.accessioned2010-04-02T18:11:18Z
dc.date.available2010-04-02T18:11:18Z
dc.date.issued2008-10-16en_US
dc.degree.disciplineCivil Engineeringen_US
dc.degree.levelthesisen_US
dc.degree.nameMSen_US
dc.description.abstractABSTRACT Venkata Lakshman Mandapaka. Effect of prolonged heating on the Asphalt-Aggregate Bond Strength of HMA containing Liquid Anti-strip Additives (Under the direction of Dr. A.A. Tayebali and Dr. Detlef Knappe) In this study, an attempt was made to determine the effect of prolonged heating on the bond strength between aggregate and asphalt that contained anti-strip additive (LOF 6500 of various percentages). A series of tests, namely Tensile Strength Ratio test (TSR), Contact Angle test, Pneumatic Adhesion test and Atomic Force Microscopy (AFM) test were performed, and the results obtained from each of these tests were compared to come to a reliable conclusion regarding effectiveness of the various tests for assessing the effect of prolonged heating on the adhesive bond strength. Results obtained from the Tensile Strength Ratio test showed that, as the prolonged heating duration increased the adhesive strength between the asphalt and aggregate was reduced. These results suggest that the non-volatilized portion of the anti-strip additive that remained in the asphalt after prolonged heating increased the moisture sensitivity of the asphalt-aggregate mixture, increased to the point where the mixtures failed the limiting TSR value of 85% as followed by NCDOT specification. Following the Tensile Strength Ratio test, Contact Angle test and Pull-Off test were performed in anticipation of expecting similar results that were obtained for the Tensile Strength Ratio test. However, due to complex interactions of such parameters as mixing of the anti-strip additive in asphalt cement, cleaning up of the glass/quartz slides, various temperature conditions, etc., the results obtained were inconclusive. Atomic Force Microscopy test was also not observed to be a good test for determination of the adhesive strength between the asphalt-aggregate. Hence, based on the results obtained we recommend that the Contact Angle test, Pull-Off test and Atomic Force Microscopy test are not effective tests for determining adhesive strength of asphalt-aggregate with anti-strip additive. Hence, based on the research, TSR test seems to be the reliable test to determine the effect of prolonged heating on adhesive bond strength of asphalt-aggregate with anti-strip additive.en_US
dc.identifier.otheretd-07022008-165013en_US
dc.identifier.urihttp://www.lib.ncsu.edu/resolver/1840.16/2214
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectportable adhesion testeren_US
dc.subjectJohnson-Kendell-Robertsen_US
dc.subjectductilityen_US
dc.subjectTensile strength ratioen_US
dc.subjectWilhelmy Plate techniqueen_US
dc.subjectde-ionizeden_US
dc.subjectanomaliesen_US
dc.titleEffect of prolonged heating on the Asphalt-Aggregate Bond Strength of HMA containing Liquid Anti-strip Additivesen_US

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