The validity of the formation factor concept from through-out diffusion tests on Portland cement mortars |
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| Affiliation: | 1. Université de Sherbrooke, Sherbrooke, QC, Canada;2. Missouri University of Science and Technology, Rolla, MO, USA;3. University of Minoufiya, Egypt;1. Construction and Environment Section, ESTB – Polytechnic Institute of Setúbal, Portugal;2. LEB – Designers and Consultants on Rehabilitation of Constructions, Ltda., Portugal;1. National Technical University of Athens, School of Civil Engineering, 5 Heroon Polytechniou St., 15772 Athens, Greece;2. National Technical University of Athens, School of Chemical Engineering, 9 Heroon Polytechniou St., 15773 Athens, Greece;3. University of Patras, Department of Environmental and Natural Resources Management, 30100 Agrinio, Greece |
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| Abstract: | The diffusion coefficients of ions and radionuclides in cementitious materials are the basic parameters to evaluate the state of the degradation of structures. In this article, three different tracers (two ions, and a radionuclide) were tested on the same formulations of mortars (sand volume fractions from 0 to 60%) in terms of the through-out diffusion, to determine the effective diffusion coefficients of each tracer and each formulation. The aim of this study is to prove the validity of the formation factor equation relating the effective diffusivity of a tracer in cementitious material to its diffusion coefficient in pure water. This result is extremely interesting because once the geometric formation factor of a material is known, it is possible to determine the values of the effective diffusion coefficients of any other diffusing species in this material. |
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| Keywords: | Diffusion Mortars Cement Microstructure Formation factor |
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