Parameters determination of dry building mixtures based on gips and polimeric additives

Abstract

Purpose. The properties determination of gypsum raw materials for the production dry building mixtures based on them.To investigate the modifier additives effect on the properties of dry construction mixtures, to establish the expediency of their use and rational quantity. The methods. Laboratory studies were performed in accordance with the current regulatory documents, which regulate the study of building composites as such and raw materials and finished products, which were considered in the submitted work. A number of experimental investigations of many-component compositions have been carried out from the point of view of their rheological and physical-mechanical properties. Additives-modifiers were considered as components that may be influencing the necessary effect on the finished material. Findings. In the production of dry building mixtures based on gypsum, it is necessary to add additives of different spectrum of action to the main composition –thickeners; additives that increase adhesion strength to the treated surface; components that prevent the formation of cracks; regulators of the gypsum hardening or even those that accelerate the hardening of the building mixture.It was determined raw materials and conditions, when using of additives-modifiers is appropriate. An analysis of the components has been made, which seems to be the widest choice with the point of view with the current technology. The most rational dosing of the all components is also given, which may have influence into the properties of the working mixtures and the ready-made budding cover. The originality. The relationship between the combination of components of the gypsum-based dry building mixture has been established, which allows to increase the interval between the beginning and end of the hardening of the gypsum-based building mortar by no less than 30 minutes. Practical implementation. The data obtained of laboratory researches allow to prepare dry building mixtures based on gypsum, that duration is predicted in hours according to all the technological operations of plastering works. It will increase the efficiency of works and improve the comfort of masters.