Abstract
The influence of mineral additive, i.e. ground granulated blast-furnace slag on artificial gypsum stone humidity strains has been studied. The slag content was varied in the range from 0 to 0.33 by weight based on the total amount of the mixture. The measurements were carried out on prism samples with dimensions of 160x40x40 mm. The samples were placed vertically in containers with water, the deformations were measured using dial indicators. It was established that the humidity strain value depends on the content of the granulated milled blastfurnace slag. A maximum strain of over 0.001 m/m is observed for the gypsum stone without mineral additive. A relative strain is decreased with an increase in the slag content. Minimum humidity strain of 0.0003-0.0004 m/m was observed for the artificial gypsum stone with the relative slag content of 0.05-0.1 and more than 0.27. This fact confirms our assumption that the water concentrated in the contacts between the individual crystals and particles of the structure of gypsum stone has a wedging effect that contributes to a low water resistance of gypsum. The values of the humidity strains of the artificial gypsum stone are suggested for the use as additional indicators of its water resistance.
Highlights
Gypsum binder-based materials are characterized by the ecological safety, sufficient strength and durability and by a low weight and relatively low heat and sound conductivity
A relative strain is decreased with an increase in the slag content
A low water resistance of gypsum materials is mainly explained by the calcium dihydrate solubility and the wedging forces that are created by the water that penetrates into the pores
Summary
Gypsum binder-based materials are characterized by the ecological safety, sufficient strength and durability and by a low weight and relatively low heat and sound conductivity. Due to these advantages, gypsum materials are widely used for construction purposes. A low water resistance of gypsum materials is mainly explained by the calcium dihydrate solubility and the wedging forces that are created by the water that penetrates into the pores. The contribution made to the water resistance of gypsum stone by abovementioned wedging forces that are created by the water that penetrates into the pores requires additional studies. The studies of the volumetric strains of the artificial gypsum stone with mineral additives and their relations with the water resistance are an important task
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