BENIFICIAL USE OF LAYERED DOUBLE HYDROXIDES FOR CHLORIDE ION BINDING IN CEMENTITIOUS MATERIALS

Author(s): Ping DUAN, Wei CHEN, Juntao MA, Haining GENG and Zhonghe SHUI
Paper category: Proceedings
Book title: Proceedings of CONSEC13 Seventh International Conference on Concrete under Severe Conditions - Environment and Loading Volume I
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 418-430
Total Pages: 961
Language : English

Abstract: Layered double hydroxides (LDHs) materials could be used in cement and concrete for their ions capturing capacity and to enhance durability of concrete. This study aims to catch chloride ion in cement paste and concrete and to fix them in intercalation layers, in order to improve chloride ion diffusion resistance by means of the properties of anion-exchange and structure re-construction of the intercalated layered materials. Properties and chloride binding capacity of different types of LDHs were compared, micro-mechanism of chloride binding of LDHs were analyzed, chloride binding of cement paste incorporating LDHs, workability and compressive strength and chloride diffusion of concrete incorporating LDHs were investigated.
The experimental results show that: Mg-Al-NO3 LDHs presents higher chloride ion binding capacity at initial time compared to LDOs calcinated at 500°C while ion binding capacity of LDHs calms down and LDOs increases with increasing mixing time. Chloride binding capacity of cement paste mainly depends on LDHs itself. Cement paste incorporating LDHs presents higher chloride binding capacity. Concrete mixtures containing LDHs and LDOs have lower workability and higher compressive strength. All types of LDHs performed beneficial effect on the chloride penetration resistance especially with addition of 1% Mg-Al-NO3 LDOs.

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