Abstract
Gypsum composites have been gaining increasing interest within last decades. Nowadays, the environment-supporting options are regaining more advocates. Thus, organic fillers are back in game. The physical and mechanical properties of gypsum composites with sawdust were tested and are described in the paper. The influence of gypsum mixture composition, the water/gypsum ratio and appropriate mineralization on the composite properties were examined. Present study focuses on the durability, thermal properties, natural radioactivity and susceptibility to biological corrosion of the tested materials.
Highlights
Gypsum composites have been gaining increasing interest within last decades
The analysis of gypsum composites samples with non-mineralized sawdust filler showed, that the bending and compression strengths deteriorate with the increase of filler and water content in the mixture
Compressive strength slightly increases compared to samples containing non-mineralized sawdust, especially at low water/gypsum ratios (W/G) ratio (0.8 and 0.9)
Summary
Gypsum composites have been gaining increasing interest within last decades. the focus on increasing their production in Poland results from the rich, countrywide natural gypsum sources and the growing amounts of synthetic gypsum derived from flue gas desulfurization in domestic power plants.Thermal and sound-proofing properties of those materials are widely known and can be improved by increasing the porosity. Gypsum composites have been gaining increasing interest within last decades. The focus on increasing their production in Poland results from the rich, countrywide natural gypsum sources and the growing amounts of synthetic gypsum derived from flue gas desulfurization in domestic power plants. Thermal and sound-proofing properties of those materials are widely known and can be improved by increasing the porosity. This can be achieved by foaming or adding pore-forming organic or non-organic agents. Different fillers can be added to gypsum plaster in order to modify its physical properties.[1] Properly applied additives can improve physical and thermal conductivity (expanded silica gel granules) or reinforce the structure (glass fibers, carbon fibers etc.)
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