Influence of freeze-thaw cycle on concrete chloride ion migration

Author(s): Liang Shi, Jianzhong Liu, Jiaping Liu
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 805-813
Total Pages: 8
Language: English

Many concrete structures locate in northern marine environment. Chloride corrosion is an important factor causing the concrete durability deterioration. The effect of freeze-thaw damage on concrete durability deterioration should also not be ignored. Many chloride ion migration models have been established in order to provide assistance for concrete structure life prediction and to give some basis for concrete durability design. But those chloride ion migration models and chloride ion migration coefficient of durability design indicators are almost obtained on the basis of the concrete matrix without any damage, while the influence of freeze-thaw cycle on the chloride ion migration of concrete have been neglected. Study on the time-dependent law of concrete chloride ion migration in freeze-thaw cycle is of great significance in area of concrete durability scientific prediction and design. In this work, the changes of concrete chloride ion migration under different freeze-thaw cycles have been investigated. Then the developments of relative dynamic elastic modulus and mass loss of concrete samples were recorded. The time dependent migration law of chloride ion in concrete subjected to freeze-thaw process was summarized. Furthermore, the mechanism of chloride ion migration of concrete in the freeze-thaw process was systematically analyzed through capillary water absorption and pore structure development.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00