| you are: Classification of natural stone materials
On indicators of volume weight natural stones share on easy and heavy. Easy stones in volume weight no more than 1800 кгм3 have a porous structure (a volcanic tufa, pumice, limestone-shell rock) and consequently are applied mainly in the form of a piece stone and blocks to walls of buildings and rubble for easy concrete. Òàî áàî com íà ðóññêîì. Òàî áàî com.
Heavy stones in volume weight more than 1800 кгм3 a dense structure (from a granite, sienita, diorita, etc.) serve as facing v are used in the form of plates of a floor, materials and products for hydraulic engineering and road building.
Durability. On strength at compression of samples in an air-dry condition natural stone materials divide into marks: 4, 7, 10, 15, 25, 35, 75, 100, 125, 150, 200, 300, 400, 500, 600, 800 and 1000. Marks with 4 to 200 are peculiar to easy stones of various porosity.
Frost resistance. On number of cycles of alternate freezing and the thawing, stood by samples in the conditions of standard test, natural stone materials divide into marks on frost resistance: Мр10, Mrz15, Mrz35, Mrz100, Mrz150, Mrz200, Mrz300 and Mrz500. Dense stones with in regular intervals-granular structure have high frost resistance. Stones with a non-uniform porphyritic structure faster rastreskivajutsja at sharp changes of temperature owing to distinction of factors of temperature expansion melkokristallicheskoj weights and large vkraplennikov.
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