METHOD OF DETERMINING FROST RESISTANCE OF POROUS MATERIALS Russian patent published in 2017 - IPC G01N3/60 

FIELD: measurement technology.

SUBSTANCE: invention relates to methods of determining frost resistance of porous materials. Several samples of a material are made, saturated with water, thermally cycled by freezing and defrosting to specified temperatures, determined are the samples deformations after defrosting, ultimate strength of the samples under the conditions of uniaxial compression and perpendicular to it residual deformations, found is the ratio of relative reduction of the ultimate strength to relative residual deformation and frost resistance of each sample is calculated, frost resistance of the material is calculated as the samples average frost resistance. After thermal cycling every sample is loaded under the conditions of uniaxial compression with a preset rate up to an extreme load meeting the short-term strength limit in the conditions of uniaxial compression, the sample is unloaded, determined is relative residual deformation in the direction perpendicular to compression, repeated is loading under the conditions of compression to an extreme load of the second loading, and relative reduction of the strength limit is determined considering the values of extreme loads at the first and the second loadings.

EFFECT: wider range of means for faster determination of a concrete grade as to freeze resistance.

1 cl, 1 tbl, 2 dwg