Application of Einstein’s diffusion equation to the rapid migration test

Title: Application of Einstein’s diffusion equation to the rapid migration test
Author(s): M.T. Silva, R.M. Ferreira, J. Gulikers
Paper category : conference
Book title: 3rd International PhD Workshop on Modelling the Durability of Reinforced Concrete
Editor(s): R. M. Ferreira, J. Gulikers, C. Andrade
Print-ISBN: 978-2-35158-095-0
e-ISBN: 978-2-35158-094-3
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 100 - 108
Total Pages: 9
Nb references: 12
Language: English

Abstract: The Rapid Migration Test (RMT) enables one to accelerate the chloride ion migration in concrete for determining the diffusion coefficient in a less time consuming manner. In this study, the Einstein’s Diffusion model is applied to the rapid migration test (RMT); a detailed analysis of the equations is presented as well as the assumptions and simplifications are quantified. In order to validate the applicability of the model, an experimental campaign was carried out to measure the chloride penetration depths by means of the RMT. Concrete samples where made with ordinary Portland cement (OPC) and constant aggregate with four different w/b ratios ranging from 0.40 to 0.78. The diffusion values where determined according to the proposed Einstein model and compared with NTBuild’s Dnss values. Results show that the chloride diffusion values obtained from the proposed model are more conservative that those attained from NTBuild 492, moreover, it was observed a linear trend between the chloride penetration velocity and w/b ratio on the concrete samples.

Online publication: 2010-02-22
Publication type : full_text
Public price (Euros): 0.00