Investigation of the Effect of Lime on Performance of Hot Mix Asphalt using Advanced Testing and Modeling Techniques

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dc.contributor.advisor Kimberly S. Weems, Committee Member en_US
dc.contributor.advisor Murthy N. Guddati, Committee Member en_US
dc.contributor.advisor Roy H. Borden, Committee Co-Chair en_US
dc.contributor.advisor Y. Richard Kim, Committee Chair en_US Lee, Sangyum en_US 2010-04-02T18:54:19Z 2010-04-02T18:54:19Z 2008-08-21 en_US
dc.identifier.other etd-08172007-011334 en_US
dc.description.abstract The benefits of using hydrated lime as an additive in asphalt concrete are well known. When added to asphalt concrete mixtures hydrated lime shows the beneficial effects of filler, while also improving resistance to moisture damage. This study presents findings from four studies into the impact of hydrated lime, the impact of lime introduction method on the volumetric optimums, and the performance evaluation of unmodified and lime-modified hot mix asphalt (HMA) mixtures at varying asphalt contents using Simple Performance Tests developed from the NCHRP projects 9-19 and 9-29 and the viscoelastic continuum damage (VECD) finite element analysis. The performance characteristics evaluated in this study include fatigue cracking and rutting behavior in both dry and moisture-conditioned states. Test methods adopted in this evaluation are: the dynamic modulus test for stiffness characterization; the triaxial repeated load permanent deformation test for rutting characterization, and the direct tension test for fatigue cracking characterization. From the experimental investigation it is found that the method of lime introduction can have an important effect on the optimum volumetric asphalt content. Regarding dynamic modulus it is found that hydrated lime has a minimal impact on the mixtures in this study. However, the findings from this study support conventional understanding of the effects of asphalt content, lime modification, and moisture conditioning on the fatigue cracking and rutting performance of HMA mixtures. That is, as asphalt content increases, the resistance to fatigue cracking improves and rutting performance worsens. Another accepted fact is that lime modification reduces the susceptibility for moisture damage in terms of both fatigue cracking and rutting. The contribution of this paper, therefore, is to demonstrate advanced test methods and models that can be used in the performance evaluation of various mixtures. With additional validation and calibration, the comprehensive methodology described in this paper may serve as the foundation for a performance-based HMA mix design and performance-related HMA specifications. en_US
dc.rights I 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.subject moisture damage en_US
dc.subject viscoelasticity en_US
dc.subject continuum damage en_US
dc.subject finite element en_US
dc.subject rutting en_US
dc.subject fatigue cracking en_US
dc.subject dynamic modulus en_US
dc.subject hydrated lime en_US
dc.title Investigation of the Effect of Lime on Performance of Hot Mix Asphalt using Advanced Testing and Modeling Techniques en_US PhD en_US dissertation en_US Civil Engineering en_US

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