METHOD OF MEASUREMENT OF SIZE OF INTRA-GRAIN EMPTINESS OF POROUS LOOSE MATERIAL Russian patent published in 2006 - IPC G01N15/08 

FIELD: test engineering.

SUBSTANCE: method can be used for production of lightweight concrete and grainy heat-insulating materials. Unit of volume is filled in layer after layer with grains of porous loose material with sizes of grains of d₁ (mm) and with grains of monolith material with sizes of d₂ (mm); d₁ is bigger than d₂. Volume V₁ (in cubic meters) of porous loose material is found which material is used for making mixture and volume V₂ (in cubic meters) of monolith material used for making mixture. Value of factor α of move of grains of porous loose material against grains of monolith one, is found from formula α=1m³/V₁m³ _. Value of space of intra-grain_{emptiness of porous loose material Vemp is found from formula Vemp= ((V2·α+1-α)d1)/(d1-d2).}

EFFECT: improved precision; higher speed of testing process; reduced cost.

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