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Effect of seasonal temperature changes on the chloride binding capacity of pastes containing SCMs



Author(s): G Yee-Ching, Y. Wang, D.K. Panesar
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: 431-439
Total Pages: 8
Language: English


Abstract: 
The design of durable reinforced concrete structures and elements is becoming increasingly important with emphasis placed on prolonging service life. The objective of this paper is to assess seasonal changes in temperature on the chloride binding capacity and pore microstructure. Chloride binding isotherms and porosity are measured for mixtures containing supplementary cementing materials. Seasonal temperature changes are represented using two exposure regimes. Exposure A consists of samples exposed at 0°C for 2 months followed by 23°C for 2 months. Exposure B consists of samples exposed at 23°C for 2 months followed by 0°C for 2 months. Preliminary outcomes show that there is a linear relation between changes in total porosity and changes in the chloride binding capacity at high free chloride concentrations. At lower chloride concentrations however, the relationship is not as clearly defined. Also, the use of 40% ground granulated blast furnace slag results in the greatest changes in porosity and binding capacity when exposed to variations in temperature compared to the mix designs containing 100% general use cement, 10% metakaolin and 10% silica fume.


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