Effect of prolonged heating on the asphalt-aggregate bond strength of HMA containing liquid anti-strip additives
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2008-09-01
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Edition:Final Report; 07/01/2006-06/30/2008
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Abstract: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 additives (LOF 6500 and Morelife 2200). On account of the
substantial decrease of anti-strip additive contents for both asphalt binders and mixes when subjected to prolonged
heating, whether the loss of additive content due to storage and transport at elevated temperatures affects mix
performance in terms of moisture sensitivity or not, was evaluated in this study. 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 clearly show that as the prolonged heating duration
increased the TSR values failed the limiting value of 85% as followed by NCDOT specification in as little as six
hours and continued to further decrease with heating duration.
Tests were also conducted on asphalt cement containing LOF 6500 antistrip additive using the contact angle
goniometer, PATTI device and atomic force microscopy (AFM). The results obtained in this study were
inconclusive for the above mentioned three devices.
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