Stabilization of Dicalcium Silicate-Zn Composite Approaching Layered Double Hydroxide Structure for Bioactive Cement Applications

Abstract:

Layered Double Hydroxide (LDH) is ionic clay that is characterized by the union of metal cations and OH^- hydroxides. LDH composites exhibit considerably high releasing and recharging capacity and have applications as bioactive cements. They can be prepared by direct co-precipitation of metal salts at controlled pH. The preparation is carried out from an acid solution of Zn (NO₃)₂.6H₂O, Al (NO₃)₃.9H₂O and a basic solution of Na₂CO₃ and NaOH, with a Zn/Al ratio = 3, the pH is stabilized between 9 and 9.5 at a constant temperature of 45°C. The objective of this study is to incorporate Zinc and Aluminum elements at different percentages in dicalcium silicate phase to produce C₂S phase incorporating LDH composite. The characterizations of the developed phases by XRD and SEM indicate the formation of stoichiometric LDH phases Zn₆Al₂(OH)₁₆CO₃.4H₂O and non-stoichiometric Zn_0.61Al_0.39 (OH)₂(CO₃)_0.195.xH₂O, the incorporation of Zn in the belitic C₂S phase and not Al. The obtained micrographs by SEM(EDAX) analysis show new morphology of the stabilized composite.

• Periodical: Construction Technologies and Architecture (Volume 1)
• Pages: 668-675
• DOI: https://doi.org/10.4028/www.scientific.net/CTA.1.668
• Online since: January 2022
• Authors: Hind Agourrame*, Amine Belafhaili, Nisrine El Fami, Nacer Khachani, Mohamed Alami Talbi, Ali Boukhari, Adeljebbar Diouri
• Keywords: Belitic Cement, Clay, Composite, Layered Double Hydroxides, Nitrates

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