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Title page for ETD etd-04072014-105428


Type of Document Dissertation
Author Arnold, Joshua Robert
URN etd-04072014-105428
Title Reducing uncertainty in the characterization and modeling of reactive transport processes in blended cement mortar
Degree PhD
Department Environmental Engineering
Advisory Committee
Advisor Name Title
David S. Kosson Committee Chair
Andrew C. Garrabrants Committee Co-Chair
Christine Langton Committee Member
Florence Sanchez Committee Member
Hans van der Sloot Committee Member
J.C.L. Meeussen Committee Member
John Ayers Committee Member
Keywords
  • supplementary cementitious materials
  • blended cement
  • SEM
  • Nernst-Planck
  • diffusion
  • reactive transport
Date of Defense 2014-02-03
Availability unrestricted
Abstract
Cements blended with industrial byproducts are ubiquitous construction materials widely used in waste management. The use of blended cements as barriers for nuclear waste management necessitates prediction of durability and long-term performance. A key component of durability prediction is mechanistically based reactive transport modeling. This work identifies critical parametric and model uncertainties within three key components of reactive transport modeling for blended cementitious materials: mass transport, mass conservation, and thermodynamic characterization. Studies of electroneutral ionic diffusion and the electrostatic interaction of dissolved ionic species and charged cement pore surfaces suggest that the influence of electrical interaction on transport may be more significant than previously surmised. A novel technique for measuring the elemental composition of reacted cementitious material in mortars compares favorably with established laboratory leaching techniques. Thermodynamic parameters developed for unblended cements are demonstrated to be generally applicable to the description of blended cements in both equilibrium and reactive transport modeling.

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