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Engineering  |  Barzin Mobasher

Transport Properties & Durability Modeling

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 With proper modeling techniques we can understand the durability conditions faster, cheaper, and more accurately.  This helps in every stage of construction and maintenance and will allow better administration of new and existing infrastructure.  The problem of the sulfate attack as a major durability concern is addressed specifically in this project.  Aspects of cement chemistry, concrete physics, and mechanics are applied to derive a model for predicting sulfate penetration, reaction, damage evolution, and expansion, leading to degradation of cement-based materials exposed to a sulfate solution.  The models developed address the interaction effects of various parameters indicate the need for calibration of the theory with the available experimental data.  A collaborative program is conducted with Scientists at the National Institutes of Standards and Technology (NIST) to apply the proposed models to the wide range of experimental data.  Current approaches used are based on refining the model parameters through parametric analysis, consideration of specific boundary conditions, and calibration with a variety of available experimental data.

  • Expansion profile as a function of time, experiment and simulation

  • sulfate penetration boundary condition

  • Diffusion profile of sulfates into a prismatic sample

Tixier, R., Mobasher, B., “Modeling of Damage in Cement–Based Materials Subjected To External Sulfate Attack- Part 1: Formulation”, ASCE Journal of Materials Engineering, August, 2003.  Volume 129, No. 4, pp. 373-382, 2003. (10 pages, pdf format, 296K) 

Tixier, R., Mobasher, B., “Modeling of Damage in Cement–Based Materials Subjected To External Sulfate Attack- Part 2: Comparison with Experiments, ASCE Journal of Materials Engineering, August 2003. (9 pages, pdf format, 142K) 

B. Mobasher, C. Ferraris, “Simulation of Expansion in Cement Based Materials Subjected to External Sulfate Attack,” Proceedings, RILEM Technical Meeting on Durability of Cement Based Materials, March, 2004. [download] 

Bonakdar, A., Mobasher, B., Dey, S.K., Roy, D. M.” Multi-Scale Evaluation of Alkali Silica Reactions in Blended Cement Materials, ACI Materials Journal, 2010, ACI Materials Journal, V.107, No. 4, pp. 380-386.  [download] 

Bakhshi, M. , Mobasher, B., “Experimental observations of vacuum drying of early-age portland cement paste”, Cement and Concrete Composites, 33, 2011, 474-484. [Download

Bonakdar, A., and Mobasher, B., “Multi-Parameter Study of External Sulfate Attack in Blended Cement Materials,” Construction and Building Materials, 24 Volume 24, Issue 1, January 2010, Pages 61-70. DOI: 10.1016/j.conbuildmat.2009.08.009  [download

Moradi-Marani, F., Shekarchi, M., Dousti, A., and Mobasher, B., “Investigation of corrosion damage and repair system in a concrete jetty structure” ASCE Journal of Performance of Constructed Facilities, 2010. http://dx.doi.org/10.1061/(ASCE)CF.1943-5509.0000112 [download] 

M. Shekarchi, A. Bonakdar, M. Bakhshi, A. Mirdamadi, and B. Mobasher, “Transport Properties in Metakaolin Blended Concrete, “ Construction & Building Materials, 24 (2010) pp 2217–2223. [download]