The influence of starting materials? solubility on tobermorite structure formation under the hydrothermal conditions

International Conference Building Materials, Products and Technologies

土木建筑工程

Galvánková, L.^1 ; Bartoníková, E.^1 ; Opravil, T.^1 ; Tkacz, J.^1 ; Ptáek, P.^1

Brno University of Technology, Faculty of Chemistry, Institute of Material Chemistry, Purkyova 118, Brno

612 00, Czech Republic^1

关键词: Cost effective;    Dissolution rates;    Hydrothermal conditions;    Hydrothermal reaction;    Influence of water;    Powdered samples;    Thermal behaviours;    Tobermorite structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/379/1/012001/pdf
DOI  :  10.1088/1757-899X/379/1/012001

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Overall, the tobermorite mineral crystallises under the hydrothermal conditions from the CaO-SiO2-H2O system. The system of calcium hydrosilicates species is extremely complex and many factors play an important role. The solubility of starting materials belongs to one of the most important factors. Dissolution rates of SiO2 source are significantly affected by their particle size distribution. Also the starting cations concentration in the aqueous solution affects the yield of the hydrothermal reaction. The main aim of this contribution is to study the influence of water-to-solid ratio on tobermorite crystallization. The effect of particle size of various sources of SiO2 was also studied. The cost effective Ca and Si sources was primarily favoured. The C/S ratio of the experiments was set to 0.83. All syntheses were performed at 180 °C in laboratory steel autoclaves. The prepared powdered samples were characterized in order to determine the phase composition by using of X-Ray diffractometry. The thermal behaviour of prepared samples was studied by TG-DTA analyser. Morphology and particle size of synthetized powdered products was studied by scanning electron microscopy.