RESEARCH ARTICLE


Solid Solution Mechanism of CO2O3 During C3S Formation



Hongbo Tan*, 1, Kai Ke2, Baoguo Ma2, Jun Xiao2
1 School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, the P.R. China
1 Key Labortory for Silicate Materials Science Engineering of Ministry of Education, Wuhan University of Technology, Wuhan 430070, Hubei, the P.R. China


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© 2011 Tan et al;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, the P.R. China; Tel: 86-27-87664845; Fax: 86-27-87160951; E-mail: thbwhut@163.com


Abstract

Polymorphism of tricalcium silicate were prepared by a calcination method with Ca(OH)2 and SiO2 as crude materials and Co2O3 as doping agent. The solid solution mechanism of Co2O3 during C3S formation were studied by means of chemical analysis, XRD and phase diagram analysis. The results show: according to phase analyse of CaO-CoO and CoO-SiO2, Co2O3 accelerated solid reaction of CaO-SiO2. When Co2O3 additive was less than 1.5% in mass, the content of f-CaO increased with the increase of Co2O3, and the formation rate of C3S was accelerated by Co2O3; when Co2O3 addition exceeded 1.5%, the content of f-CaO decreased with the increase of Co2O3. By the least square method and defined f-CaO, the molecular formula that Co2O3 solidified in C3S could be deduced: (Ca3-0.86x Co0.86x) (Si1- 0.14xCo0.14x) O5 (x=0.0209).

Keywords: C3S, crystal form, phase diagram, solid solution.