R
Ravi Ajitbhai Patel
Researcher at Paul Scherrer Institute
Publications - 33
Citations - 444
Ravi Ajitbhai Patel is an academic researcher from Paul Scherrer Institute. The author has contributed to research in topics: Portland cement & Lattice Boltzmann methods. The author has an hindex of 11, co-authored 23 publications receiving 298 citations. Previous affiliations of Ravi Ajitbhai Patel include University of Colorado Boulder & Karlsruhe Institute of Technology.
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Journal ArticleDOI
Diffusivity of saturated ordinary Portland cement-based materials: A critical review of experimental and analytical modelling approaches
Ravi Ajitbhai Patel,Quoc Tri Phung,Suresh Seetharam,Janez Perko,Diederik Jacques,Norbert Maes,Geert De Schutter,Guang Ye,Guang Ye,Klaas van Breugel +9 more
TL;DR: A comprehensive overview of existing experimental and modelling approaches to determine effective diffusion coefficients of water saturated ordinary Portland cement-based materials can be found in this article, where a dataset for diffusivity obtained from different experimental techniques have been presented for cement paste, mortar and concrete.
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A versatile pore-scale multicomponent reactive transport approach based on lattice Boltzmann method: Application to portlandite dissolution
Ravi Ajitbhai Patel,Janez Perko,Diederik Jacques,Geert De Schutter,Klaas van Breugel,Guang Ye,Guang Ye +6 more
TL;DR: In this article, a Boltzmann-based pore-scale multicomponent reactive transport approach is presented to capture mineral phase and pore structure evolution resulting from geochemical interactions applicable, for example to model microstructural evolution of hardened cement paste during chemical degradation.
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Single-relaxation-time lattice Boltzmann scheme for advection-diffusion problems with large diffusion-coefficient heterogeneities and high-advection transport
Janez Perko,Ravi Ajitbhai Patel +1 more
TL;DR: An approach that extends the flexibility of the standard lattice Boltzmann single relaxation time scheme in terms of spatial variation of dissipative terms and stability for high Péclet mass transfer problems and an alternative way of dealing with large diffusion coefficient variations in advection-diffusion transport systems by introducing so-called diffusion velocity.
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Effective diffusivity of cement pastes from virtual microstructures: Role of gel porosity and capillary pore percolation
Ravi Ajitbhai Patel,Janez Perko,Diederik Jacques,Geert De Schutter,Guang Ye,Guang Ye,Klaas Van Bruegel +6 more
TL;DR: In this article, the role of capillary percolation and gel pores is investigated to explain the underlying differences between relative diffusivity obtained from different experimental techniques using microstructures generated from two different types of hydration model.
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Multiscale modeling of ion diffusion in cement paste: electrical double layer effects
Yuankai Yang,Ravi Ajitbhai Patel,Sergey V. Churakov,Sergey V. Churakov,Nikolaos I. Prasianakis,Georg Kosakowski,Moran Wang +6 more
TL;DR: In this article, a multiscale modeling technique has been proposed to combine atomic-scale and pore-scale modeling, where the lattice Boltzmann method is used to solve a modified Nernst Planck equation to model transport of ions in gel pores.