Modeling the transport of ions in unsaturated cement-based materials

Alternative methodology to consider damage and expansions in external sulfate attack modeling

“…Different proposals may be found in the literature to consider the pore filling effect [4,18,19]. In this work, the hyperbolic function proposed by Idiart et al [4] has been adopted, which yields comparable trends to the relationship proposed by…”

“…Samson & Marchand [19] and has the advantage to explicitly depend on the initial porosity ( 0 ). The diffusion coefficient is calculated according to Eq.…”

Evaluation of Sulfate Attack on Saltstone Vault Concrete and Saltstonesimco Technologies, Inc. Part1 Final Report

“…Consequently the surrogate data can be used in the initial SRNL Porflow runs required to meet the Saltstone PA schedule. 3 3 STADIUM ® results using data for the saltstone Vaults 1 / 4 and Disposal Unit 2 concrete samples prepared at SIMCO Technologies, Inc., are expected to be available and will be provided in the final report due at the end of the calendar year. Due to the low porosities and permeabilities and high degree of sulfate resistance of the saltstone Vaults 1 / 4 and Disposal Unit 2 concretes, validation of the model results is not expected for several months after the final report is issued.…”

“…A comparison of these values with values used in the SRS PAs is provided in Table 5-5. 4 6 E-08 1 E-08 NO 3 1.9 E-07 4 E-08 NO 2 1.9 E-07 5 E-08…”

“…For the simulations it was assumed that the NO 3 -and NO 2 -did not react with other species to form additional phases or solid solutions. A more detailed discussion of the equilibrium mineral assemblage is provided in Attachment 2.…”