Effect of Nanosilica on The Formation of Calcium sulphoaluminate Hydrates Prepared from Nanomaterials
H. El-Didamony1, B. A. Sabrah2, S. Abd El-Aleem Mohamed3, H. Gouda4
1H. El-Didamony, Department of Chemistry, Faculty of Science, Zagazig University, Zagazig, Egypt.
2B. A. Sabrah, Department of Chemistry, Faculty of Science, Fayoum University, Fayoum, Egypt.
3S. Abd El-Aleem Mohamed, Department of Chemistry, Faculty of Science, Fayoum University, Fayoum, Egypt.
4H. Gouda, Department of Chemistry, Faculty of Science, Fayoum University, Fayoum, Egypt.
Manuscript received on October 04, 2015. | Revised Manuscript received on October 09, 2015. | Manuscript published on October 31, 2015. | PP: 13-21 | Volume-2 Issue-11, October 2015. | Retrieval Number: K03421021115
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Nano-materials such as nanosilica (NS), nano-calcium hydroxide {Ca(OH)2}, and nano-aluminum hydroxide {Al(OH)3} have been synthesized using a suitable method. In addition, gypsum has been prepared by precipitation method. The as prepared nano materials are characterized using x-ray diffraction (XRD), transmission electron microscopy. The average particle sizes are 15 nm, 49 nm and 25 for NS, Ca(OH)2 and Al(OH)3 , respectively. These nano-materials are mixed with gypsum in a stoichiometric ratio to form ettringite as well as monosulphate mixes. NS was added to these mixes and hydrated at room temperature up to 28 days. All hydrated samples were characterized by performing chemical methods, XRD, differential thermal analysis, and thermal gravimetric analysis techniques. It was found that, the disappearance of Ca(OH)2 due to its consumption during the reaction with NS stabilizes ettringite formation.
Keywords: Etrringite, ettringite+NS, hydration time, characterization techniques.