The influence of the addition of gypsum on some selected properties of lime-metakaolin mortars

Construmat 2018

Majerova, J.^1 ; Drochytka, R.^1

Institute of Technology of Building Materials and Components, Faculty of Civil Engineering, Brno University of Technology, Veveri 331/95, Brno

602 00, Czech Republic^1

关键词: Bulk density;    Compressive and flexural strengths;    Historic buildings;    Hydration process;    Lime-metakaolin plasters;    Modified lime;    Technological properties;    Volumetric changes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/385/1/012034/pdf
DOI  :  10.1088/1757-899X/385/1/012034

来源: IOP

【 摘 要 】

The renovation and replacement of historical plasters is still a very current topic. Today's trend is for the production of dry mortar mixtures that can be used for the renovation of historic buildings. The article therefore focuses on the preparation of gypsum-modified lime-metakaolin mortar. An experiment consisted of two stages. In the first stage of the experiment, the basic technological properties of fresh and hardened mortars were examined (bulk density of fresh and hardener mortar, compressive and flexural strength). The second stage aimed at monitoring the hydration process in different environments. Environments should simulate real factors affecting the plaster (humidity, low and higher temperatures). To determinate of the phase composition, the X-ray diffraction analysis was used. The results showed that gypsum in the lime-metakaolin plaster caused an increase in compressive and flexural strength. The presence of gypsum also conduced to the formation of ettringite and this has caused volumetric changes.