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Evolutionary Characteristics of Microstructural Hydration and Chloride Diffusion in UHPC

May 5, 2023 @ 10:00 am - 11:00 am


Evolutionary Characteristics of Microstructural Hydration and Chloride Diffusion in UHPC

This webinar presents the evolutionary characteristics of microstructural hydration and chloride migration in ultra-high performance concrete (UHPC). The physicochemical interactions of constituents are simulated in conjunction with a random walk algorithm. The computed responses of the UHPC mixtures at a compressive strength varying from f’c = 149 MPa to 164 MPa are comparatively evaluated for a curing period of 28 days against those of ordinary concrete involving f’c = 30 MPa to 45 MPa. When the hydration of cementitious pastes proceeds, the quantity of silicates becomes larger alongside irregularly dispersed byproducts (calcium silica hydrate, C-S-H, and calcium hydroxide, CH). Owing to the formation of pozzolanic C-S-H consuming CH, the silicate reactions of UHPC are less than the reactions of the ordinary concrete. The implications of tricalcium silicate (C3S) are notable for the early-age strength gain of UHPC in comparison with its dicalcium silicate (C2S) counterpart. The matured pozzolanic reactions and invariable packing density of UHPC are responsible for preserving the proportion of silica fume in the mixtures. While the volumetric increase of conventional C-S-H is not controlled by water-binder ratios of the ordinary concrete and UHPC within 2 days of hydration, the extent of the pozzolanic C-S-H is tantamount to that of the conventional C-S-H at 28 days. Relative to UHPC, the ordinary concrete releases more heat caused by exothermic reactions that are a function of saturated pores and silica fume. Regarding corrosion durability, the chloride contents of a bridge deck cast with the ordinary concrete exceed the content of a deck with UHPC. As part of technology transfer, the notion of performance-based design applies and practice guidelines are suggested.


Yail Jimmy Kim.

Yail Jimmy Kim, PhD, PE, F.ACI
University of Coloroda Denver

Dr. Yail Jimmy Kim is President of the Bridge Engineering Institute, An International Technical Society, a Professor in the Department of Civil Engineering at the University of Colorado Denver, Denver, CO, and Site Director of the National Center for Transportation Infrastructure Durability & Life-Extension (TriDurLE). He is Chair of American Concrete Institute (ACI) Subcommittee 440I (FRP-Prestressed Concrete) and past Chair of ACI Committee 345 (Concrete Bridge Construction and Preservation). He is a member of ACI Committees 342 (Evaluation of Concrete Bridges and Bridge Elements), 377 (Performance-Based Structural Integrity & Resilience of Concrete Structures), 440 (Fiber Reinforced Polymer Reinforcement), and Joint ACI-ASCE Committee 343 (Concrete Bridge Design). He has received the Chester Paul Siess Award for Excellence in Structural Research in 2019. His research interests encompass advanced composite materials for rehabilitation, structural informatics, complex systems, and science-based structural engineering, including statistical, interfacial, and quantum physics.

Jun Wang, PhD, Postdoctoral Fellow
University of Coloroda Denver

Dr. Jun Wang is a Post-Doctoral Fellow in the Department of Civil Engineering at the University of Colorado Denver, Denver, CO. She has received BS and MS from Northeast Forestry University and the University of Colorado Denver, respectively. Her research interest includes multi-object interaction, advanced modeling, and concrete structures.

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May 5, 2023
10:00 am - 11:00 am


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