Title α-C2SH, kilchoanito bei hidroksiledgrevito sintezė ir jų funkcinės savybės /
Translation of Title Synthesis and functional properties of α-C2SH, kilchoanite and hydroxyledgrewite.
Authors Dambrauskas, Tadas
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Pages 34
Keywords [eng] calcium silicates hydrates ; hydrothermal synthesis ; thermal stability ; alternative cementitious materials ; microcalorimetry
Abstract [eng] The aim of this work is to create an innovative preparation technique for the production of an environmentally friendly cementitious material which will combine the hydrothermal synthesis of calcium silicates and/or calcium silicates hydrates and their solid-state sintering at a low temperature. In this work a new methodology for the formation of anhydrous calcium silicate – kilchoanite – under hydrothermal conditions was developed. In addition, for the first time, a dibasic calcium silicate hydrate, hydroxyledgrewite (Ca9(SiO4)4(OH)2), was synthesized under hydrothermal conditions (CaO/SiO2=2.25; 48 h; 200 °C), its physical and chemical properties were investigated, and this compound was used for the production of an environmentally friendly cementitious material. It was estimated that synthetic calcium silicates and/or calcium silicates hydrates formed in non-stoichiometric mixtures; after mechanochemical and thermal activation, they can be used for the manufacturing of environmentally friendly cementitious materials. The properties of the created materials correspond to the requirements of belite and special low-heat cements. The obtained environmentally friendly cementitious materials can be used as an alternative for the ordinary Portland cement. The preparation technique of the above mentioned materials requires a 600–1000 °C lower calcination temperature as well as a lower quantity of calcium carbonate, which leads to lower CO2 emissions.
Dissertation Institution Kauno technologijos universitetas.
Type Summaries of doctoral thesis
Language Lithuanian
Publication date 2019