Estimation of chloride transport in cementitious materials based on characteristics of hydration products

Authors: K. Sasaki, T. Saeki
Paper category: conference
Book title: Concrete Durability and Service Life Planning – ConcreteLife’09
Editor(s): K. Kovler
Print ISBN: 978-2-35158-074-5
e-ISBN: 978-2-35158-085-1
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 262 – 269
Total Pages: 8
Language: English

Abstract: It is important for service life prediction of concrete structures to estimate mass transport accurately. Mass transport in concrete depends on the microstructure of concrete. The microstructure of concrete is affected by addition of mineral admixtures, such as ground granulated blast-furnace slag and fly ash, and chemical interaction with the environment, e.g. carbonation. However, the effect of mineral admixtures and carbonation on microstructure characteristics and chloride diffusion coefficient have not been clarified sufficiently.
In this study, microstructure characteristics of hardened cementitious materials were estimated by a chloride diffusion cell test. Chloride diffusion coefficient, porosity and the amount of hydration products of mortars were measured. Microstructure characteristics, such as tortuosity and constrictivity, of both non-carbonated and carbonated mortars using mineral admixtures were calculated. It was concluded that tortuosity and constrictivity were significantly changed by the addition of mineral admixtures and by carbonation. Furthermore, an estimation method of the chloride diffusion coefficient based on characteristics of hydration products was proposed. In particular, the effect of Ca/Si ratio of C-S-H on
microstructure characteristics was considered.

Online publication: 2012-05-16
Publication Type: full_text
Public price (Euros): 0.00