@article{rashetnia_kusam_yadav_pour-ghaz_tayebali_2022, title={Quantifying moisture damage in asphalt concrete using axisymmetric flexural vibration technique}, volume={23}, ISSN={["1477-268X"]}, DOI={10.1080/10298436.2020.1757671}, abstractNote={ABSTRACT The Tensile Strength Ratio (TSR) test is commonly used to quantify the moisture susceptibility of asphalt mixtures. This test method is based on the indirect tensile strength, which is not a fundamental property and hence cannot be used in the asphalt mixture design process. Therefore, alternative test methods that use a fundamental property to quantify moisture sensitivity of asphalt mixtures are needed. This study investigates if the linear impact resonance shift and frequency spectrum bandwidth changes measured using Axisymmetric Flexural Vibration (AFV) technique can be used to quantify moisture damage. This test enables calculation of the dynamic elastic modulus of the disk, based on measured resonance frequency as well as quantification of vibration energy dissipation in the specimens based on the change in bandwidth of frequency spectrum. AFV test is used to quantify moisture damage susceptibility of asphalt mixture specimens with different moisture conditioning levels and different mixture designs. The results of the AFV test are compared with the TSR test. Also, the sensitivity of the AFV test to quantify the effect of thixotropic aging due to storage and temperature are discussed. The results show that the AFV technique can successfully quantify moisture damage and the effect of aging and temperature change.}, number={3}, journal={INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING}, author={Rashetnia, Reza and Kusam, Abhilash and Yadav, Shivpal and Pour-Ghaz, Mohammad and Tayebali, Akhtarhusein}, year={2022}, month={Feb}, pages={523–535} }
 @article{yadav_kusam_tayebali_2021, title={Evaluating Moisture Damage Using Impact Resonance Test}, volume={49}, ISSN={["1945-7553"]}, DOI={10.1520/JTE20200372}, abstractNote={Abstract}, number={6}, journal={JOURNAL OF TESTING AND EVALUATION}, author={Yadav, Shivpal and Kusam, Abhilash and Tayebali, Akhtarhusein A.}, year={2021}, month={Nov}, pages={4118–4134} }
 @article{cho_karshenas_tayebali_guddati_kim_2017, title={A mechanistic approach to evaluate the potential of the debonding distress in asphalt pavements}, volume={18}, ISSN={["1477-268X"]}, DOI={10.1080/10298436.2016.1149837}, abstractNote={Abstract The debonding distress in asphalt pavement structures is a critical problem that affects the performance of asphalt concrete pavements. It occurs at the layer interface due to the poor bond quality between adjacent asphalt concrete layers and/or when stresses at the layer interface exceed the strengths of the material at the interface. The debonding of the adjacent layers, especially the top surface layer of an asphalt pavement, is a contributing factor to the premature cracking of pavements. Hence, the debonding distress can lead to a reduction in the life of the pavement. This paper presents an analytical and experimental framework to evaluate the potential for debonding at the layer interface of asphalt concrete pavements. Computational analysis was performed to determine the critical stress and strain states in layered asphalt pavements under moving vehicle loads using the Layered ViscoElastic pavement analysis for Critical Distresses (LVECD) computer program developed at North Carolina State University. This computational analysis enables a greater understanding of the critical stress that is involved in debonding and the ways that such stress is affected by pavement design parameters and environmental conditions. In addition, a prediction model was developed that can determine the shear bond strength at the interface of asphalt concrete layers with different tack coat materials at various temperatures, loading rates and normal confining stresses. The systematic and mechanistic framework developed in this study employs the maximum shear ratio concept as a shear failure criterion and provides a tool to evaluate the effects of various loading, environmental and pavement factors on the debonding potential of asphalt pavements. The overall advantages of the mechanistic framework and approach using the LVECD analysis tool will help lead to better understanding of the debonding mechanism, proper selection of the tack coats, and economic benefit in highway pavement maintenance and rehabilitation costs.}, number={12}, journal={INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING}, author={Cho, Seong-Hwan and Karshenas, Afshin and Tayebali, Akhtarhusein A. and Guddati, Murthy N. and Kim, Y. Richard}, year={2017}, pages={1098–1110} }
 @article{kusam_malladi_tayebali_khosla_2017, title={Laboratory Evaluation of Workability and Moisture Susceptibility of Warm-Mix Asphalt Mixtures Containing Recycled Asphalt Pavements}, volume={29}, ISSN={["1943-5533"]}, DOI={10.1061/(asce)mt.1943-5533.0001825}, abstractNote={AbstractWarm mix asphalt (WMA) and recycled asphalt pavements (RAP) are two popularly used sustainable technologies in pavement industry. Because RAP materials contain aged binder, its use is limit...}, number={5}, journal={JOURNAL OF MATERIALS IN CIVIL ENGINEERING}, author={Kusam, Abhilash and Malladi, Haritha and Tayebali, Akhtarhusein A. and Khosla, N. Paul}, year={2017}, month={May} }
 @article{malladi_ayyala_tayebali_khosla_2015, title={Laboratory Evaluation of Warm-Mix Asphalt Mixtures for Moisture and Rutting Susceptibility}, volume={27}, ISSN={["1943-5533"]}, DOI={10.1061/(asce)mt.1943-5533.0001121}, abstractNote={AbstractSince its introduction, warm mix asphalt (WMA) has garnered a lot of attention and interest from the pavement industry as a promising technology to replace the conventional hot mix asphalt (HMA). Despite its many benefits, including reducing emissions and fuel usage, definitive answers on the feasibility of replacing HMA pavements with WMA are yet to be answered. A major concern for WMA is susceptibility to moisture-induced damage. In this research study, mixtures prepared using three WMA technologies- viz. Sasobit, Advera WMA and the Foamer were evaluated for their moisture susceptibility and permanent deformation in comparison with an HMA mixture. Tensile strength ratio (TSR) and asphalt pavement analyzer (APA) tests were conducted on these mixtures. Results show that moisture-based WMA technologies (Advera and Foamer) are more susceptible to moisture damage. However, rut depths evaluated using APA, even for moisture-conditioned specimens, indicated WMA performance on par with that of HMA. Even ...}, number={5}, journal={JOURNAL OF MATERIALS IN CIVIL ENGINEERING}, author={Malladi, Haritha and Ayyala, Dinesh and Tayebali, Akhtarhusein A. and Khosla, N. Paul}, year={2015}, month={May} }
 @inproceedings{ayyala_malladi_khosla_tayebali_2014, title={Evaluation of warm mix asphalt technology for surface mixtures}, DOI={10.1201/b17219-88}, abstractNote={Economic, environmental, and engineering benefits led to the rapid implementation of Warm-Mix Asphalt (WMA) during the past decade. While WMA technologies are generally performing well to date, development of standard mix design protocols continues and performance questions remain. This study evaluated laboratory conditioning protocols for WMA to simulate early life when they are more moisture susceptible and proposed 2 hours at 116°C for mix design and reheating to this temperature for quality assurance for all WMA technologies except foaming which requires reheating to 135°C. Next, WMA was shown to be more moisture susceptible as compared to Hot-Mix Asphalt in the early life based on a comprehensive analysis of three standard laboratory tests (wet and dry indirect tensile strengths and resilient modulus and their ratios and Hamburg Wheel Tracking Test stripping parameters) from four field projects that included nine WMA mixtures. Finally, an evaluation of performance evolution showed that WMA can overcome this vulnerability to moisture after a summer of aging and proposed 5 days oven aging at 85°C to capture this effect in the laboratory. Proposed conditioning protocols, aging protocols, and criteria for the tests utilized are provided for WMA mix design and analysis to preclude moisture susceptibility.}, booktitle={Asphalt Pavements, vol 1}, author={Ayyala, D. and Malladi, H. and Khosla, N. P. and Tayebali, A. A.}, year={2014}, pages={701–708} }
 @article{karshenas_cho_tayebali_guddati_kim_2014, title={Importance of Normal Confinement to Shear Bond Failure of Interface in Multi layer Asphalt Pavements}, ISSN={["2169-4052"]}, DOI={10.3141/2456-17}, abstractNote={Several direct shear test devices are used to evaluate the shear bond strength of tack coat materials in interlayer bonding in asphalt pavements. Some devices have the capability of evaluating strength in direct shear with normal confinement, whereas other devices do not have that capability or use passive confinement to evaluate the interlayer bond strength. The literature indicates that interlayer bond strength increases with the application of normal confinement. However, the question remains as to the level of normal confinement, if any, that should be used in direct shear testing to evaluate the interlayer bond strength for specification acceptance or design. This study presents a methodology to interpret laboratory bond strength test results in relation to the state of stress at the layer interface in a representative pavement section. The results confirm the importance of normal confinement for shear bond strength evaluation and provide guidance for the selection of the appropriate level of normal confinement.}, number={2456}, journal={TRANSPORTATION RESEARCH RECORD}, author={Karshenas, Afshin and Cho, Seong-Hwan and Tayebali, Akhtarhusein A. and Guddati, Murthy N. and Kim, Y. Richard}, year={2014}, pages={170–177} }
 @article{visintine_khosla_tayebali_2013, title={Effects of higher percentage of recycled asphalt pavement on pavement performance}, volume={14}, ISSN={["1468-0629"]}, DOI={10.1080/14680629.2013.779310}, abstractNote={The recycling of asphalt pavements has become a very routine procedure throughout the country. Research has shown that the recycled asphalt pavement (RAP) recovered from construction sites still contains usable materials, both in the recycled aggregates and recycled binder. The fatigue life and rut resistance of mixtures containing various amounts of recycled asphalt pavement (RAP) were compared with a virgin mixture. The fatigue life and rut resistance of the mixtures were calculated from laboratory testing using Frequency Sweep Testing using Superpave Simple Shear Tester (SST) and Repeated Simple Shear Tests using (SST) device. The SHRP A-003A surrogate models and the Asphalt Institute models were both be used in order to predict pavement performance using the results from the Frequency Sweep Testing and the Repeated Simple Shear Test.}, number={2}, journal={ROAD MATERIALS AND PAVEMENT DESIGN}, author={Visintine, Beth and Khosla, N. Paul and Tayebali, Akhtar}, year={2013}, month={Jun}, pages={432–437} }
 @article{cunningham_evans_tayebali_2013, title={Gradation effects on the mechanical response of crushed stone aggregate}, volume={14}, ISSN={["1477-268X"]}, DOI={10.1080/10298436.2012.690518}, abstractNote={A study was conducted to evaluate the effects of varying the gradation of aggregate base course (ABC) on material performance. Five different gradations consistent with a range of common ABC were selected. Experimental trials were performed to classify the materials and assess the performance differences between the five gradations. The gradation was found to affect the behaviour of the aggregate in that coarser gradations gave better strength and resilience values under conditions most similar to those found in the field. From research and experience during the laboratory testing, it was concluded that the coarsest blends became too difficult to realistically work with and they also lacked the stability of the well-graded combinations. It was also observed that as the amount of fines in the specimens exceeded 8–12% by mass, the fines governed the behaviour of the material. Results are interpreted using previously published work on specific surface, ‘ideal’ gradations and micromechanical models for the response of granular materials.}, number={3}, journal={INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING}, author={Cunningham, Charles N. and Evans, T. Matthew and Tayebali, Akhtar A.}, year={2013}, month={Apr}, pages={231–241} }
 @article{levis_barlaz_tayebali_ranjithan_2011, title={Quantifying the Greenhouse Gas Emission Reductions Associated with Recycling Hot Mix Asphalt}, volume={12}, ISSN={1468-0629 2164-7402}, url={http://dx.doi.org/10.1080/14680629.2011.9690352}, DOI={10.1080/14680629.2011.9690352}, abstractNote={ABSTRACT Market based policies to reduce greenhouse gas emissions have become increasingly popular in the last decade. These policies provide economic incentives for reducing greenhouse gas emissions. A life-cycle inventory model was developed to evaluate three alternatives for the management of waste hot mix asphalt (HMA) including, (1) recycling as new aggregate, (2) recycling as new HMA, and (3) disposal in a landfill. Global warming potential, environmental emissions, and total energy use were quantified for each management alternative. The recycling of used asphalt into new HMA results in a reduction of 16 kg CO2e compared to landfilling. Recycling used HMA as aggregate reduced GHG emissions by 9 kg CO2e A Monte Carlo analysis on the alternatives showed that the range of reduction for recycling as HMA was 12 to 26 kg CO2e and for recycling as aggregate 6 to 11 kg CO2e.}, number={1}, journal={Road Materials and Pavement Design}, publisher={Informa UK Limited}, author={Levis, James W. and Barlaz, Morton A. and Tayebali, Akhtar and Ranjithan, S. Ranji}, year={2011}, month={Jan}, pages={57–77} }
 @inproceedings{evans_mojarrad_cunningham_tayebali_2009, title={Grain Size Distribution Effects in 2D Discrete Numerical Experiments}, ISBN={9780784410226}, url={http://dx.doi.org/10.1061/41022(336)8}, DOI={10.1061/41022(336)8}, abstractNote={The discrete element method (DEM) is becoming increasingly popular for the simulation and study of the mechanical response of granular materials. The narrow grain size distributions (GSD) used in most DEM studies are not necessarily representative of real soils, wherein grain sizes vary over several orders of magnitude. In the current study, biaxial compression tests on two-dimensional particulate assemblies are simulated and the results analyzed as a function of GSD. Four GSD's are simulated and material response is interpreted in terms of stress-strain-strength behavior at the macroscale and in terms of particle-level properties at the microscale. These types of studies may ultimately lead to a better fundamental understanding of the response of real soils with varying GSD's. Results of the simulations indicate that a coarser well-graded specimen has a higher shear strength than a finer well-graded specimen, consistent with a higher rate of dilation at peak for the coarser specimen. The more uniformly graded specimen is softer at low strains, requires a higher strain to peak, and is significantly more dilatant than the well-graded assemblies.}, booktitle={Contemporary Topics in In Situ Testing, Analysis, and Reliability of Foundations}, publisher={American Society of Civil Engineers}, author={Evans, T. Matthew and Mojarrad, Hamed and Cunningham, Charles and Tayebali, Akhtar A.}, year={2009}, month={Mar} }
 @article{chen_tayebali_knappe_2006, title={A  procedure to quantify organic antistrip additives in asphalt binders and mixes}, volume={34}, DOI={10.1520/jte12733}, abstractNote={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.}, number={4}, journal={Journal of Testing and Evaluation}, author={Chen, C. and Tayebali, A. A. and Knappe, D. R. U.}, year={2006}, pages={269–274} }
 @article{kulkarni_fischer_tayebali_waller_2005, title={Evaluation of tack coat bond strength for mixtures containing baghouse fines}, volume={6}, ISSN={1029-8436 1477-268X}, url={http://dx.doi.org/10.1080/10298430500111975}, DOI={10.1080/10298430500111975}, abstractNote={This study investigated the causes of delamination distresses observed in Division 13 of North Carolina Department of Transportation (NCDOT). The two factors that were believed to contribute to the delamination distress—intermittent purging of baghouses in AC mixes and improper selection and/or application rate of tack coat, vis-à-vis the use of CRS-2 emulsion versus PG64-22 binder—were investigated. Test results based on field cores and laboratory prepared specimens indicated that mixtures containing baghouse fines produced more rut resistant mixes. However, these mixtures were found to be extremely water sensitive. Test results also indicated that asphalt cement used as tack coat (PG64-22) provided better interlayer bond strength compared to the CRS-2 emulsion. Based on the results of this investigation the cause of delamination was attributed to the combined effect of the intermittent purging of baghouse fines with the use of CRS-2 emulsion as tack coat.}, number={3}, journal={International Journal of Pavement Engineering}, publisher={Informa UK Limited}, author={Kulkarni, M.B. and Fischer, W. Kevin and Tayebali, A.A. and Waller, H. Fred}, year={2005}, month={Sep}, pages={147–162} }
 @article{kulkarni_xu_tayebali_2003, title={Development of a procedure to determine the effectiveness of asphalt-removing solvents}, volume={31}, number={5}, journal={Journal of Testing and Evaluation}, author={Kulkarni, M. and Xu, Q. X. and Tayebali, A.}, year={2003}, pages={429–437} }
 @inbook{natu_tayebali_2003, title={Performance and acceptability criteria for crumb rubber modified binders with same performance graded (PG) rating}, ISBN={8590399710}, booktitle={Proceedings of the asphalt rubber 2003 conference : Brasilia, Brazil, December 2003}, publisher={Brasilia: Asphalt Rubber Conference}, author={Natu, G. S. and Tayebali, A. A.}, editor={Sousa, Jorge B.Editor}, year={2003} }
 @inbook{natu_guada_tayebali_2001, title={Evaluation of the sensitivity of repeated simple shear test at constant height based on rutting characteristics of WesTrack fine mixes}, ISBN={0803128924}, booktitle={Aggregate contribution to hot mix asphalt (HMA) performance}, publisher={West Conshohocken, PA: ASTM}, author={Natu, G. S. and Guada, I and Tayebali, A. A.}, editor={Thomas D. White, Sam R. Johnson and J., JohnEditors}, year={2001} }
 @article{natu_a._2000, title={Viscoelastic behavior of crumb rubber modified asphalt binders}, volume={1}, number={1}, journal={Road Materials and Pavement Design}, author={Natu, G. S. and A., Tayebali A.}, year={2000}, pages={119–129} }
 @inbook{tayebali_khosla_waller_1999, title={Evaluation of superpave repeated shear at constant height test to predict rutting potential of mixes: Performance of three pavement sections in North Carolina}, ISBN={0309071070}, DOI={10.3141/1681-12}, abstractNote={ The repeated shear at constant height (RSCH) test to predict the rutting potential of asphalt aggregate mixes based on field performance of pavement sections in North Carolina has been evaluated. Three pavement sections in Buncombe, McDowell, and Montgomery counties were selected based on the degree of rutting severity experienced after several years in service. The pavement section in Buncombe County showed no rutting, whereas those in McDowell and Montgomery counties showed light and severe rutting distress, respectively. Results of this study indicated that the RSCH test can clearly identify the well-performing versus poorly performing mixes (i.e., Buncombe versus Montgomery counties). Although previous studies in which the French pavement rutting tester and the Georgia loaded-wheel tester were used indicated early rutting of the pavement in Buncombe County, the RSCH test indicated that the mix was not susceptible to excessive rutting—in line with field experience of no significant pavement distress observed in this pavement. For Montgomery County, the RSCH test clearly showed that the mix was susceptible to excessive rutting with the wheelpath cores distinctly showing potential for tertiary flow—in agreement with experience of significant rutting distress observed in this pavement. }, number={1681}, booktitle={Hot-mix asphalt mixtures}, publisher={Washington, DC: National Academy Press}, author={Tayebali, A. A. and Khosla, N. P. and Waller, H. F.}, year={1999}, pages={97} }
 @article{natu_tayebali_1999, title={Mixture design and accelerated laboratory performance evaluation of unmodified and crumb rubber modified mixtures}, volume={68}, journal={Journal of the Association of Asphalt Paving Technologists}, author={Natu, G. and Tayebali, A. A}, year={1999}, pages={192–221} }
 @inproceedings{bienvenu_khosla_tayebali_1998, title={Development of a binder blending chart for cold-recycled mix design using the dynamic shear rheometer}, volume={1652}, booktitle={Seventh International Conference on Low-Volume Roads 1999  (Transportation research record; 1652)}, publisher={Washington, D.C.: National Academy Press}, author={Bienvenu, M. E. and Khosla, N. P. and Tayebali, A. A.}, year={1998} }
 @inbook{tayebali_malpass_khosla_1998, title={Effect of mineral filler type and amount on design and performance of asphalt concrete mixtures}, ISBN={0309064546}, number={1609}, booktitle={Superpave: Binder specifications, mixture design and construction}, publisher={Washington, DC: Transportation Research Board}, author={Tayebali, A. A. and Malpass, G. A. and Khosla, N. P.}, year={1998}, pages={36–43} }
 @book{tayebali_malpass_khosla_waller_1998, title={Evaluation of applicability of SUPERPAVE test methods to predict performance and tertiary flow potential of asphalt-aggregate mixes containing unmodified and modified asphalt binders}, publisher={Raleigh, NC: Center for Transportation Engineering Studies, North Carolina State University}, author={Tayebali, A. A. and Malpass, G. and Khosla, N. P. and Waller, H. F.}, year={1998} }
 @inproceedings{prozzi_harvey_tayebali_1998, title={The use of repeated flexural bending for the determination of flexural stiffness of asphalt concrete at different temperatures and frequencies}, number={1998 Jan.}, booktitle={Transportation Research Board 77th annual meeting, January 11-15, 1998, Washington, D.C.: Preliminary program}, author={Prozzi, J. A. and Harvey, J. T. and Tayebali, A. A.}, year={1998} }
 @inproceedings{a reliability-based mix design and analysis system for mitigating fatigue distress_1997, booktitle={Eighth International Conference on Asphalt Pavements, August 10-14, 1997, Seattle, Washington: Proceedings.}, publisher={Seattle, Wash.: University of Washington}, year={1997}, pages={301–324} }
 @inproceedings{tayebali_vyas_malpass_1997, title={Effect of crumb rubber particle size and concentration on performance grading of rubber modified asphalt binders progress of superpave (superior performing asphalt pavement): Evaluation and implementation}, volume={1322}, booktitle={Progress of superpave (superior performing asphalt pavement): Evaluation and implementation  (ASTM special technical publication; 1322)}, publisher={West Conschocken, PA: ASTM}, author={Tayebali, A. A. and Vyas, B. B. and Malpass, G.}, year={1997}, pages={30–47} }
 @inproceedings{norris_tayebali_1997, title={Hurricane Fran damage observations}, number={1997 June}, booktitle={Eight U.S. National Conference on Wind Engineering, Baltimore, Maryland, June, 1997}, author={Norris, R. E. and Tayebali, A. A.}, year={1997} }
 @article{influence of binder loss modulus on the fatigue performance of asphalt concrete pavements_1997, volume={66}, number={1997}, journal={Journal of the Association of Asphalt Paving Technologists}, year={1997}, pages={633–685} }
 @inbook{tayebali_harvey_tanco_doty_monismith_1997, title={Performance characteristics of asphalt concrete mixes containing conventional and modified asphalt binders}, booktitle={Asphalt science and technology}, publisher={New York, NY: Marcel Dekker, Inc.}, author={Tayebali, A. A. and Harvey, J. T. and Tanco, A. and Doty, R. N. and Monismith, C. L.}, year={1997}, pages={479–503} }