Bentonite Additives on Autoclaved Sand-Lime Product Properties

The paper presents the results of the research on modifications of sand-lime bricks with bentonite additives. The article presents correlations between physico-mechanical properties and a microstructure of traditional silicates and products modified with bentonite. Numerous images of scanning electron microscopy included in the article show the internal structure and phases occurring in both traditional and modified sand-lime products. The addition of bentonite results in a reduction of sand-lime products density and their compressive strength. The modified products achieve lower absorbability than conventional silicates by about 50%. The addition of bentonite changes the structure of pores and their distribution. The modified composition of a traditional silicate product contributed to changing the microstructure of the material (hydrogranates are formed).