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Studies of chloride binding in paste exposed in chloride salt solutions



Title: Studies of chloride binding in paste exposed in chloride salt solutions
Author(s): Z. Jin, W. Sun, J. Jiang, T. Zhao, Q. Li
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 745 - 753
Total Pages: 9
Nb references: 18
Language: English


Abstract: In this paper, bound chloride content of paste particle and paste, which are plain paste containing Portland cement (PC) alone and pastes with 0~50% of fly ash addition, 0~65% of ground granulated blast furnace (GGBS), was systematically investigated under chloride salt solutions. The chloride salt solution includes three types: 3%NaCl solution, Qingdao sea water and composite solution of 3% NaCl and 1% MgSO4. The experimental results shown that the amount of bound chloride is about 4.8~4.9 mgCl-/g sample for paste particles stored in NaCl solution, and it reduces about 33~46% and 11~13% as paste particles stored in Seawater and in composite solution, respectively. The chloride binding capacity of plain paste is about 0.2 as it immersed in NaCl solution, and it reduces about 50% and 25% as paste stored in sea water and in composite solution. The chloride binding capacity of pastes with GGBS is about 0.32~0.79, and it is the highest and about 6.6 times that of the plain paste as GGBS replacement level being 35%. The chloride binding capacity of paste with fly ash ranges from 0.2 to 0.28. And for a fly ash replacement level of 25%, the chloride binding capacity is the highest. In order to elucidate the above experimental results in a microscopic scale, the mechanism was also investigated by derivative thermogravimetry and differential enthalpic calorimetry (DTG/DSC) and X-ray diffraction (XRD) techniques.


Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00