%0 Journal Article
%T Synthesis of CaO-SiO<sub>2</sub> Compounds Using Materials Extracted from Industrial Wastes
%A Nobuaki Yamaguchi
%A Yoshiko Masuda
%A Yoshishige Yamada
%A Hideaki Narusawa
%A Cho Han-Cheol
%A Yukimichi Tamaki
%A Takashi Miyazaki
%J Open Journal of Inorganic Non-metallic Materials
%P 1-10
%@ 2164-6805
%D 2015
%I Scientific Research Publishing
%R 10.4236/ojinm.2015.51001
%X Mineral trioxide aggregate (MTA) cement is an attractive material in endodontic dentistry. The purpose of this study was to produce calcium silicate, which is a major component of MTA, from waste materials. A dental alginate impression gel and used chalks were selected and mixed in a suitable ratio (Code: EXP). As a control, CaCO<sub>3</sub> and a commercial diatomite were used (Code: CON). Each powder was heated to 850<sup>ĄŁ</sup>C and 1000<sup>ĄŁ</sup>C, and then kneaded with water. TG-DTA, compressive tests, SEM observations, elemental mapping analyses, and XRD analyses were performed. TG-DTA indicated that weight reduction of CaCO<sub>3</sub> started at 600<sup>ĄŁ</sup>C, and it completely decomposed on heating at 850<sup>ĄŁ</sup>C. The strength was affected by the temperature. After heating, CaCO<sub>3</sub> was transformed into CaO and/or Ca<sub>2</sub>SiO<sub>4</sub>, and Ca(OH)<sub>2</sub> was formed by mixing with water. There were no differences between EXP and CON. These data suggested that recycled wastes might be promising MTA sources.
%K Recycling
%K Calcium Silicate
%K Diatomite
%K Alginate Impression Material
%K Calcium Hydroxide
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52498