M. Alnaggar Picture

Mohammed G Alnaggar

Senior Research Scientist - Structural Optimization and Modeling of Traditional and 3D-printed Concrete

Contact

alnaggarmg@ornl.gov | 865.341.1841

Bio

Dr. Alnaggar got his B.Sc. and M.Sc. from Zagazig University in Egypt. His M.Sc. published research was one of the very early applications of Neural Networks use in Compensating Time-Delay in active control of seismically excited structures. In 2014 he got his PhD from Northwestern University, Evanston, IL. In his Ph.D. research, he developed physics-based models of aging and deterioration of concrete materials. His research focused on Alkali silica reaction (ASR) modeling coupled with creep and shrinkage. Just after finishing his PhD, he joined Rensselaer Polytechnic Institute as an Assistant Professor in 2014. At RPI, his research developed into three main thrusts, the first covered multi-scale multi-physics computational modeling of time-dependent behavior of cementitious materials from the micro-scale up to the structural scale. His second thrust dealt with understanding complex load transfer mechanisms in reinforced cementitious materials with traditional reinforcement, GFRP reinforcement, and short fibers. His third thrust focused on advancing the state of the art of cementitious materials additive manufacturing through computational modeling of the fluid to solid transition as well as the development of effective temporary supported concrete 3D printing.

Education                                                                                                                                 

  • PhD in Structural Engineering, Northwestern University, Evanston (IL), USA.   09/2011 – 06/2014
  • M.Sc. in Structural Engineering, Zagazig University, Zagazig, EGYPT.              02/2003 - 04/2009
  • B.Sc. in Civil Engineering, Zagazig University, Zagazig, EGYPT.                        09/1997 - 05/2002

Professional Experience                                                                                             

  • Senior Research Scientist, Oak Ridge National Laboratory, Oak Ridge (TN), USA.    08/2021 - to date
  • Assistant Professor, Rensselaer Polytechnic Institute, Troy (NY), USA.                      08/2014 - 08/2021
  • Post-Doctoral research fellow, Northwestern University, Evanston (IL), USA.             06/2014 - 08/2014
  • Research and Teaching Assistant, Northwestern University, Evanston (IL), USA.       09/2011 - 05/2014
  • Research and Teaching Assistant, Rensselaer Polytechnic Institute, Troy (NY), USA.08/2010 - 08/2011
  • Assistant Lecturer, Zagazig University, Zagazig, EGYPT.                                             05/2009 - 07/2010
  • Research and Teaching Assistant, Zagazig, EGYPT.                                                    02/2003 - 04/2009

Technical Skills                                                                                          

  • Mechanical modeling frameworks (Continuum mechanics, Finite Element Analysis, Discrete mechanics, Molecular dynamics, poro-mechanics, Fluid dynamics)
  • Constitutive modeling of solids under static, dynamic and impact loading considering (Fracture mechanics, Damage mechanics, Elasticity, Plasticity, Visco-elasticity, Visco-plasticity)
  • Multi-physics modeling of coupled electro-chemo-physical processes (Heat diffusion, moisture and charged ionic diffusion through porous media)
  • Composite materials modeling (Particulate, fiber reinforced, and woven composites)
  • Structural optimization and CAD software (Altair – Optistruct, NX, Solidworks, Fusion 360, AutoCad)
  • Analysis software (Abacus, Ansys, LSDYNA, LAMMPS,  LIGGGHTS, MARS, OpenFoam)
  • Additive manufacturing/Data acquisition and control software (Mach3, Slicers, LabView)
  • Scientific computing using (C, C++, Python, Fortran, Basic, Matlab, MPI, OpenMP)

Refereed Journal Publications

     Google Scholar: 668 citations, h-index 15, i10-index 16

     ResearchGate:

  1. Xiaoying Pan, Bora Gencturk, Mohammed Alnaggar, Muazzam Ghous Sohail, Ramazan Kahraman, Nasser Al Nuaimi, Debora F. Rodrigues, Yucel Yildirim, (2023) “Numerical simulation of the fracture and compression response of self-healing concrete containing engineered aggregates”, Cement and Concrete Composites,Volume 136,104858,ISSN 0958-9465
  2. L. Yang, M. Pathirage, H. Su, M. Alnaggar, G. Di Luzio, and G. Cusatis, (2022) “Computational modeling of expansion and deterioration due to alkali–silica reaction: Effects of size range, size distribution, and content of reactive aggregate”, International Journal of Solids and Structures, 234-235, 111220.
  3. M. Alnaggar, G. Cusatis, R. Wan-Wendner and G.Di Luzio (2021) “Mesoscale modeling of concrete time-dependent behavior”, BETON I ŽELEZOBETON. 2021(2). p.24-48
  4. L. Yang, M. Pathirage, H. Su, M. Alnaggar, G. Di Luzio, and G. Cusatis, (2021) “Computational modeling of temperature and relative humidity effects on concrete expansion due to alkali-silica reaction”, Cement and Concrete Composites, 124, 104237, https://doi.org/10.1016/j.cemconcomp.2021.104237  
  5. Raveen Rathnasinghe, Robert F. Karlicek Jr., Michael Schotsaert, Mattheos Koffas, Brigitte Arduini, Sonia Jangra, Bowen Wang, Jason L. Davis, Mohammed Alnaggar, Anthony Costa, Richard Vincent, Adolfo Garcia-Sastre, Deepak Vashishth, Priti Balchandani, (2021) “Scalable, effective, and rapid decontamination of SARS-CoV-2 contaminated N95 respirators using germicidal ultra-violet C (UVC) irradiation device”, Sci Rep 11, 19970. https://doi.org/10.1038/s41598-021-99431-5
  6. S. Gomaa, T. Bhaduri, and M. Alnaggar, (2021) “Coupled Experimental and Computational investigation of the interplay between discrete and continuous reinforcement in Ultra-High Performance Concrete Beams. I: Experimental testing”. ASCE Journal of Engineering Mechanics,  147(9). DOI: 10.1061/(ASCE)EM.1943-7889.0001948.
  7. T. Bhaduri, S. Gomaa, and M. Alnaggar, (2021) “Coupled Experimental and Computational investigation of the interplay between discrete and continuous reinforcement in Ultra-High Performance Concrete Beams. II: Mesoscale Modeling”. ASCE Journal of Engineering Mechanics, 147(9). DOI: 10.1061/(ASCE)EM.1943-7889.0001941.
  8. Y. Zhang, G. Di Luzio, and M. Alnaggar, (2021) “Coupled multi-physics simulation of chloride diffusion in saturated and unsaturated concrete”. Construction and Building Materials, Volume 292, ISSN 0950-0618, https://doi.org/10.1016/j.conbuildmat.2021.123394.
  9. C. Sanon, S. Salem, and M. Alnaggar, (2021) “Macroscopic moisture diffusion effects on Freeze-Thaw behavior of regular and air entrained concrete”. International Journal of Damage Mechanics (under review)
  10. M. Abdellatef, and M. Alnaggar, (2020) “Energy-based Coarse Graining of the Lattice Discrete Particle Model (LDPM)”, Journal of Engineering Mechanics, 146(5):1-15. DOI: 10.1061/(ASCE)EM.1943- 7889.0001743
  11. M. Abdellatef, I. Boumakis, R. Wan-Wendner, and M. Alnaggar,  (2019) “Lattice Discrete Particle Modeling of concrete coupled creep and shrinkage behavior: A comprehensive calibration and validation study.” Construction and Building Materials, Volume 211, Pages 629-645, ISSN 0950-0618
  12. R. Rezakhani, M. Alnaggar and G. Cusatis, (2019) “Multiscale homogenization analysis of the Alkali-Silica-Reaction effect in concrete”, Engineering, 5(6), 1139-1154, https://doi.org/10.1016/j.eng.2019.02.007
  13. S. Khodaie, F. Matta, and M. Alnaggar, (2019) “Discrete Meso-Scale Modeling and Simulation of Shear Response of Scaled Glass FRP Reinforced Concrete Beams Without Stirrups”, Engineering Fracture Mechanics, Volume 216,ISSN 0013-7944,https://doi.org/10.1016/j.engfracmech.2019.106486
  14. M. Abdellatef, J. Vorel, R. Wan-Wendner, and M. Alnaggar,  (2018) “Predicting Time Dependent Behavior of Post-Tensioned Concrete Beams: A Discrete Multiscale Multiphysics Formulation.” Journal of Structural Engineering 145 (7), 04019060.
  15. M. Alnaggar, D. Pellesone and G. Cusatis,  (2018) “Lattice Discrete Particle Modeling of Reinforced Concrete Flexural Behavior.”. Journal of Structural Engineering 145 (1), 04018231. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002230
  16. M. Alnaggar and N. Bhanot,  (2018) “A machine learning approach for the identification of the Lattice Discrete Particle Model parameters”. Engineering Fracture Mechanics, Volume 197, Pages 160-175.
  17. Erol Lale, Roozbeh Rezakhani, M Alnaggar and G Cusatis,  (2018) “Homogenization coarse graining (HCG) of the lattice discrete particle model (LDPM) for the analysis of reinforced concrete structures”. Engineering Fracture Mechanics, Volume 197, Pages 259-277.
  18. M Pathirage, F Bousikhane, M D’Ambrosia, M Alnaggar and G Cusatis,  (2018) “Effect of alkali silica reaction on the mechanical properties of aging mortar bars: Experiments and numerical modeling”. International Journal of Damage Mechanics, 1056789517750213
  19. M. Alnaggar, G. Cusatis and G. Di Luzio,  (2017) “Modeling Time-Dependent Behavior of Concrete Affected by Alkali Silica Reaction in Variable Environmental Conditions. ”. Materials 10, no. 5: 471.
  20. A. Duan, D. W. Zhang, and M. Alnaggar (2015) “Microplane modeling of ASR effects on concrete structures”, Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science). 49: 1939-1945. DOI: 10.3785/j.issn.1008- 973X.2015.10.016 

  21. M. Alnaggar, M. Liu, J. Qu, and G. Cusatis, (2015) “Lattice Discrete Particle Modeling of acoustic nonlinearity change in accelerated alkali silica reaction (ASR) tests”, Materials and Structures, 1–23, doi:10.1617/s11527-015-0737-9.
  22. M. Alnaggar, G. Cusatis and G. Di Luzio, (2013) “Lattice Discrete Particle Modeling (LDPM) Of Alkali Silica Reaction (ASR) Deterioration Of Concrete Structures”. Cement and Concrete Composites (41), 45-59. http://www.sciencedirect.com/science/article/pii/S0958946513000802
  23. S. Abdel Salam, H. Soliman, A.E. Bakeri and M. Alnaggar. “Compensation of Time Delay Effect in Active Controlled MDOF Structures Using Neural Networks”, Journal of American Science, 8(7):717-724. http://www.jofamericanscience.org/journals/am-sci/am0807/106_9774am0807_717_724.pdf

Conference Proceedings

  1. Y. Le Pape, E. Tajuelo Rodriguez, A. Cheniour, M. Alnaggar, J. Arregui Mena, P. Bran Anleu, T. M. Rosseel, and A. Brooks, 2022. "Life Beyond 80: Can Concrete Degradation Synergistic Modes Become Showstoppers for Light Water Reactors?". United States. https://www.osti.gov/servlets/purl/1890330.
  2. M. Alnaggar, O. El Shafee, M. Abdellatef, and V. G. Bennett, (2020) “Immersive learning based introduction to engineering design”, ASCE Structures Congress 2020, St. Louis, MO, April 5-8, 2020
  3. A. Tsamis, A. Toledano, and M. Alnaggar (2020) “Towards Functionally Graded Bio-Composites in Additive Manufacturing”, ACSA 108th Annual Meeting, March 13, 2020
  4. S. Gomaa and M Alnaggar, (2019) "Transitioning from shear to flexural failure of Ultra High Performance Concrete Beams by varying fiber content", 2nd International Interactive Symposium on Ultra-High Performance Concrete, Albany, NY, June 2-5 2019
  5. T. Bhaduri and M Alnaggar, (2019) "Modeling of Steel Reinforced Ultra-High-Performance Concrete (UHPC) Beams failure", 2nd International Interactive Symposium on Ultra-High Performance Concrete, Albany, NY, June 2-5 2019
  6. S. Khodaie , F. Matta, and M Alnaggar, (2017) "Numerical Simulation of Shear Behavior of Scaled GFRP Reinforced Concrete Beams without Stirrups Using Lattice Discrete Particle Model", 6th Asia-Pacific Conference on FRP in Structures Proceedings (APFIS2017), Singapore, July 19-21 2017
  7. M. Abdellatef, J. Vorel, R. Wendner, and M. Alnaggar, (2017) “Lattice Discrete Particle Modeling of Time Dependent Behavior of Prestressed Concrete Beams.”, 2017 PCI Convention & National Bridge Conference in Cleveland, Ohio, Berkeley, February 28 - March 4, 2017
  8. M. Abdellatef, E. Salem, D. Lau, L. Stenroos and M. Alnaggar, (2016) “Bond degradation of corroded reinforcement: an experimental and numerical study”, 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures proceedings (FraMCoS9), Berkeley, CA, May 29-June 1 2016
  9. S. Khodaie, F. Matta, and M. Alnaggar, (2016) “lattice discrete particle modeling of shear failure in scaled gfrp reinforced concrete beams without stirrups”, 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures proceedings (FraMCoS9), Berkeley, CA, May 29-June 1 2016
  10. R. Rezakhani, M. Alnaggar and G. Cusatis, (2016) “Multiscale Homogenization Modeling Of Alkali-Silica-Reaction Damage In Concrete”, 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures proceedings (FraMCoS9), Berkeley, CA, May 29-June 1 2016
  11. M. Alnaggar and G. Cusatis, (2016) “Lattice Discrete Particle Modeling (LDPM) of Flexural Size effect in Over Reinforced Concrete Beams”, 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures proceedings (FraMCoS9), Berkeley, CA, May 29-June 1 2016
  12. G. Cusatis, M. Alnaggar, P. Gardoni, M. D‘Ambrosia, J. Qu,(2015) “Aging and deterioration of concrete structures. Learning from the past, assessing the present, and predicting the future: science or magic?”, proceedings of CONCREEP-10, September 21-23, Vienna, Austria (Plenary lecture)
  13. M. Abdellatef, M. Alnaggar, I. Boumakis, G. Cusatis, G. Di Luzio, R. Wendner (2015) “Lattice Discrete Particle Modeling for coupled concrete creep and shrinkage using Solidification Microprestress Theory”, proceedings of CONCREEP-10, September 21-23, Vienna, Austria
  14. M. Alnaggar, G. Cusatis, J. Qu, and M. Liu, “Simulating Acoustic Nonlinearity Change in Accelerated Mortar Bar Tests: A discrete Meso-Scale Approach”, Proceedings of Fourth International Symposium on Life-Cycle Civil Engineering IALCCE 2014 November 16-19, Waseda University, Tokyo, Japan
  15. G. Cusatis, M. Alnaggar, and R. Rezakhani, “Multiscale Modeling Of Alkali Silica Reaction Degradation Of Concrete”, Proceedings of RILEM International Symposium on Concrete Modelling, CONMOD 2014, October 12-14, Tsinghua University, Beijin, China
  16. G. Cusatis, R. Rezakhani, M. Alnaggar, X. Zhou and D. Pelessone, “Multiscale computational models for the simulation of concrete materials and structures”.  Computational Modeling of Concrete Structures - Proceedings of EURO-C 2014. 2014;1:23-38. (Plenary lecture)
  17. M. Alnaggar, G. Cusatis and G. Di Luzio, “A Discrete Model For Alkali-Silica-Reaction In Concrete”. 8th International Conference on Fracture Mechanics of Concrete and Concrete Structures proceedings (FraMCoS8), Toledo, Spain, March 10-14, 2013. http://framcos.org/FraMCoS-8/p425.pdf
  18. G. Di Luzio, M. Alnaggar, G. Cusatis. “Lattice Discrete Particle Modeling Of Alkali-Silica-Reaction Effects To Concrete Structures”, Proceedings of Numerical Modeling Strategies for Sustainable   Concrete Structures (SSCS2012). Aix-en-Provence, France, May 29-June 1, 2012
  19. M. Alnaggar, G. Cusatis. “Automatic Parameter Identification Of Discrete Mesoscale Models With Application To The Coarse-Grained Simulation Of Reinforced Concrete Structures”, ASCE Structures Congress 2012, 20th Analysis and Computation Specialty Conference proceedings, Chicago, IL, March 29-31, 2012, 406-417. http://dx.doi.org/10.1061/9780784412374.036
  20. S. Abdel Salam, H. Soliman, A.E. Bakeri and M. Alnaggar. “Compensating Time Delay Effect In The Active Controlled Structures Using Neural Networks”, American Society Of Civil Engineers, 6th International Engineering and Construction Conference proceedings (IECC’6), Advances in Affordable Housing & Green Construction, Cairo, Egypt June 28-30, 2010

Research and technical reports

  1. Members of the Nuclear Energy Agency Committee On The Safety Of Nuclear Installations. “Final Report on Phase 1 of the Assessment of Structures Subjected to Concrete Pathologies”, Nuclear Energy Agency, Nuclear Safety, NEA/CSNI/R(2016)13, July 2017.
  2. Members of the Nuclear Energy Agency Committee On The Safety Of Nuclear Installations. “Final Report on Phase 2 of the Assessment of Structures Subjected to Concrete Pathologies”, Nuclear Energy Agency, Nuclear Safety, NEA/CSNI/R(2018)4/ADD1, January 2019.
  3. M. Alnaggar, L. Kallipoliti, and J. Draper “Friendship interlocking plastic bottles as versatile building materials: Structural capacity, architectural ecology, and thermal behavior”, Final Report. Friendship Products LLC. Grant No. J71842. October 2019. Department of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA.

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