Selected Publications
Journal Papers
- Z. Leng, A. Gamez, and I. Al-Qadi, Mechanical property characterization of warm-mix asphalt prepared with chemical additives, Journal of Materials in Civil Engineering, 2013 (in press)
- X. Yu, Z. Leng, and T. Wei, Investigation of the rheological modification mechanism of warm-mix additives on crumb rubber modified asphalt, Journal of Materials in Civil Engineering, 2013 (in press)
- L. Zhou, F. Ni, and Z. Leng, Development of an asphalt pavement distress evaluation method for freeways in China, Journal of Transportation Research Record, 2013 (in press)
- P. Shangguan, I. Al-Qadi, and Z. Leng, Innovative approach for asphalt pavement compaction monitoring using ground-penetrating radar, Journal of Transportation Research Record, 2013 (in press)
- Z. Leng, I. Al-Qadi, and P. Shangguan, Field application of ground penetrating radar for asphalt mixture density measurement: a case study of Illinois route 72 overlay. Journal of Transportation Research Record, TRR 2304, 2012, pp. 133-141
- I. Al-Qadi, Z. Leng, J. Baek, H. Wang, M. Doyen, and S. Gillen, Early-age performance evaluation of warm SMA: laboratory testing on plant-compacted specimens and on-site stiffness measurement, Journal of Transportation Research Record, TRR 2306, 2012, pp. 86-94
- Shangguan, I. Al-Qadi, and Z. Leng, Development of wavelet technique for railroad ballast fouling condition quantification using ground penetrating radar data, Journal of Transportation Research Record, TRR 2289, 2012, pp. 95-102
- I. Al-Qadi, H. Wang, J. Baek, Z. Leng, M. Doyen, and S. Gillen, Effects of curing time and reheating on performance of warm stone matrix asphalt, Journal of Materials in Civil Engineering, Vol. 24(11), 2012, pp. 1422¨C1428
- H Ozer, I. Al-Qadi, H. Wang, Z. Leng, Characterisation of interface bonding between hot-mix asphalt overlay and concrete pavements: modelling and in-situ response to accelerated loading, International Journal of Pavement Engineering, Vol. 13 (2), 2012, pp. 181-196
- Z. Leng, I. Al-Qadi, and S. Lahaour, Development and validation for in-situ asphalt mixture density prediction model, NDT&E International, Elsevier, Vol. 44, Issue 4, 2011, pp. 369-375
- I. Al-Qadi, Z. Leng, S. Lahaour, and J. Baek, In-place hot-mix asphalt density measurement using ground penetrating radar, Journal of Transportation Research Record, TRR 2152, 2010, pp.19-27
- Z. Leng, and I. Al-Qadi, Railroad ballast evaluation using ground penetrating radar: laboratory investigation and field validation, Journal of Transportation Research Record, TRR 2159, 2010, pp.110-117
- I. Al-Qadi, W. Xie, R. Robert, and Z. Leng, Data analysis techniques for GPR used for assessing railroad ballast in high radio-frequency environment, Journal of Transportation Engineering, Vol.136, Issue 4, 2009, pp.392-399
- Z. Leng, I. Al-Qadi, S. Carpenter, and H. Ozer, Interface bonding between HMA and various PCC surfaces: APT assessment and interface strain measurements, Journal of Transportation Research Record, TRR 2127, 2009, pp.20-28
- Z. Leng, H. Ozer, I. Al-Qadi, and S. Carpenter, Interface bonding between HMA and various PCC surfaces: laboratory assessment, Journal of Transportation Research Record, TRR 2057, 2008, pp. 46-53
- H. Ozer, I. Al-Qadi, Z. Leng, A fracture based friction model for pavement interface characterization, Journal of Transportation Research Record, TRR 2057, 2008, pp. 54-63
- F. Ni, H. Xu, and Z. Leng, and Q. Liu, Influence of asphalt properties on the performance of porous asphalt mixture, Journal of Traffic and Transportation Engineering (China), Vol.3, No.4, 2003, pp.1-4
- Z. Leng, F. Ni, H. Xu, and M. Qin, Variables affecting the air voids and reasonable gradation of the porous asphalt mixture, Jiangsu Transportation Research (China), No.5, 2002, pp.12-14
Conference Papers
- Z. Leng, I. Al-Qadi, J. Baek, M. Doyen, H. Wang, and S. Gillen, Effect of reheating plant warm SMA on its fracture performance, 7th RILEM International Conference on Cracking in Pavements, Netherland, Jun. 2012
- D. Mishra, E. Tutumluer, Z. Leng, and I. Al-Qadi, Assessment of subsurface deformation in unsurfaced pavements using ground penetrating radar, 91st Annual Meeting of Transportation Research Board, Washington D.C., Jan. 2011
- Z. Leng, and I. Al-Qadi, Flexible pavement quality assurance using ground penetrating radar, 1st ASCE T&DI Congress, Chicago, IL, Mar. 2011
- Z. Leng, and I. Al-Qadi, Development and validation for in-situ asphalt mixture density prediction model, 90th Annual Meeting of Transportation Research Board, Washington D.C., Jan. 2011
- Z. Leng, and I. Al-Qadi, Dielectric constant measurement of railroad ballast and application of STFT for GPR data analysis, 7th International Symposium on Nondestructive Testing in Civil Engineering, Nantes, France, Jul. 2009
- Z. Leng, I. Al-Qadi, J. Baek, and S. Lahouar, Selection of antenna type and frequency for pavement surveys using GPR, 88th Annual Meeting of Transportation Research Board, Washington D.C., Jan. 2009
- Z. Leng, I. Al-Qadi, S. Carpenter, and H. Ozer, Tack coat type and application rate optimization to enhance HMA overlay-PCC interface bonding: laboratory and APT testing, 3rd International Conference on Accelerated Pavement Testing, Madrid, Spain, Oct. 2008
- Z. Leng, I. Al-Qadi, H. Ozer, and S. Carpenter, Tack coat rate optimization and environmental effect on HMA overlay-PCC pavement bonding, International Symposium on Asphalt Pavements and Environment, Zurich, Switzerland, Aug. 2008
- H. Ozer, I. Al-Qadi, and Z. Leng, A fracture-based constitutive model for pavement interface characterization, 6th RILEM International Conference on Cracking in Pavements, Chicago, IL, Jun. 2008
Technical Reports/Technology Digests
- I. Al-Qadi, J. Baek, Z. Leng, H. Wang, M. Doyen, J. Kern, S.L. Gillen, Short-Term Performance of Modified Stone Matrix Asphalt (SMA) Produced with Warm Mix Additives, Research Report 12-001, Illinois Center for Transportation, Jan. 2012
- I. Al-Qadi, Z. Leng, and A. Larkin, In-Place Hot Mix Asphalt Density Estimation Using Ground Penetrating Radar, Illinois Center for Transportation, Research Report ICT-11-096, Dec. 2011
- Z. Leng, and I. Al-Qadi, Comparative Life Cycle Assessment between Warm SMA and Conventional SMA, Research Report ICT-11-090, Illinois Center for Transportation, Sep. 2011
- Z. Leng, I. Al-Qadi, and D. Davis, Data Analysis of Railroad Substructure Conditions Using Ground
Penetrating Radar, Technology Digest, TD-09-033, TTCI, Pueblo, CO, Dec. 2009
- I. Al-Qadi, S. Carpenter, Z. Leng, H. Ozer, and J. Trepanier, Tack Coat Optimization for HMA Overlays: APT? Report, Illinois Center for Transportation, Rantoul, IL, Feb. 2009
- I. Al-Qadi, S. Carpenter, Z. Leng, H. Ozer, and J. Trepanier, Tack Coat Optimization for HMA Overlays: Laboratory Test Report, Illinois Center for Transportation, Rantoul, IL, Sep. 2008
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