METHOD FOR DETERMINING THE AMOUNT OF CEMENT IN A PRODUCT MADE OF A CEMENT-SAND MIXTURE Russian patent published in 2021 - IPC G01N33/38 

FIELD: construction

SUBSTANCE: invention relates to the field of construction technology and can be used to determine the amount of cement in a frozen cement-sand mixture. The method for determining the amount of cement in an article made of a cement-sand mixture consists in loading the surface of the article by means of a spherical indenter with two different loads on the depth of residual imprints, amounting to 2-10% of the diameter of the indenter, measuring the depth of residual imprints and calculating the amount of cement according to the following relationship:

,

where C is the amount of cement in a product made of a cement-sand mixture (%), D is the diameter of a spherical indenter (mm), a and b are coefficients depending on the properties of cement and sand, and g is the coefficient of plastic contact stiffness of a product made of a cement-sand mixture (N/mm), determined by the formula

,

where F₁ and F₂ are indenter loads (Н), h₁ and h₂ are residual indentation depths (mm).

EFFECT: high-precision determination of the cement content in products made of cement-sand mixtures, the ability to control the quality of finished building structures and products during their creation and operation.

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