Abstract
The technology of building stones from concrete and lime-sand mixes includes the process of unidirectional pressure molding. As stated at the Laboratory of Concrete Mechanics of Riga Technical University, this leads to anisotropy of mechanical properties of the material obtained, e.g., the acoustic anisotropy, found by measuring the velocity of ultrasonic pulse waves, is about 1.1-1.25. This is due to a large number of microdefects appearing in the horizontal planes after very quick unloading of the raw mix compacted in the mould. This harmful phenomenon has found practical use in elaborating a new and simple splitting technology for production of more lightweight facing tiles. These new tiles are essentially lower in cost than the analogous traditional materials - the split facing brick or sedimentary natural stone.
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