METHOD TO DETERMINE COMPOSITION OF DRY CONSTRUCTION MIX FOR CONCRETE Russian patent published in 2015 - IPC G01N33/38 C04B28/00 

FIELD: construction.

SUBSTANCE: previously prepared samples with various quantity of a filler in a highly dispersed condition for a dry construction mix are placed into a hollow part of metal washers, placed on a metal plate, are compacted by any available method under permanent load of up to 5 MPa per 1 cm² of sample surface for 10-15 seconds, then marks are applied on the surface of each sample in the form of drops of a solution of various concentration, wetting angles of samples are measured θ, a curve of dependence is built cosθ-1=f(1/σ_l), where σ_l - surface tension of the liquid, they determine the angle of inclination of this functional dependence a for each sample of different composition, the curve of dependence a is built on quantity of mix components, and by the point of break of the curve of dependence they define the optimal content of a modifier in the tested object.

EFFECT: reduced number of tests and higher accuracy of mixture composition selection.

2 cl, 2 dwg, 1 tbl