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Abstract:

Autoclaved sand-lime products (silicates) are manufactured from natural raw materials and they are classified as healthy and ecological materials. A traditional raw material mix consists of quicklime (about 7% by weight), quartz sand (about 90% by weight) and water (about 3% by weight). Due to the great interest of silicate products, there have been numerous studies and modifications designed to refine the material. The article presents the research of sand - lime products. Correlations between their physical and mechanical properties and microstructure. Numerous images of scanning electron microscopy and EDS analysis contained in the article show the internal structure and phase occurring in the traditional sand - lime product and modified with different additives. The bentonite addition reduced the compressive strength by about 30% compared to the traditional sample. The addition of chalcedonite dust increased compressive strength about 20%. The microstructure has changed, both in shape, distribution and pore size, as well as the phases that have been produced in the autoclave process.

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Mechanical properties, phase composition and microstructure of autoclaved sand – lime product