Numerically accelerated chemical evolution in cementitious systems

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Abstract

This paper describes the approach for numerical acceleration of reactive transport pore-scale models where transport dominates dissolution/precipitation processes. Chemical changes in cementitious systems are typically transport dominated because of slow chemical reaction rates. The conditions under which the acceleration is possible and the level of acceleration are analysed. For this purpose we derive a new dimensionless number. On this basis the applicability of the approach is demonstrated on a simple system as well as on complex systems and applied to dissolution processes. The result demonstrate that, in the case of calcium leaching from hardened cement paste the dissolution can be accelerated for 50 times.

Details

Original languageEnglish
Title of host publicationSynerCrete'18
Subtitle of host publicationInterdisciplinairy approaches for cement-based materials and structural concrete: synergizing expertise and bridging scales of space and time
PublisherRILEM Publications
Pages761-766
Number of pages6
VolumePRO 121
StatePublished - 24 Oct 2018
EventInterdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time - Funchal, Madeira, Portugal

Conference

ConferenceInterdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time
Abbreviated titleSynerCrete'18
CountryPortugal
CityFunchal, Madeira
Period2018-10-242018-10-26
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Keywords

  • Hardened cement paste, Pore-scale modelling, Calcium dissolution, Numerical acceleration

ID: 4961974