What requirements must be met for adhesive mixtures in a dry state?
The amount of cement in the adhesive mixture must exceed 35% of the mass
The specific effective activity of natural radionuclides of adhesive mixtures should not exceed the limit values established by GOST 30108
The largest grain size of the adhesive mixture should not exceed 0.63 mm.
The bulk density of the adhesive mixture should not exceed 1600 kg/m3
The content of grains larger than 0.63 mm in the adhesive mixture should not exceed 0.50%
The moisture content of adhesive mixtures should not exceed 0.30% by weight
Material on this issue is presented in the GOST R 56387 .
An example of a symbol for an adhesive mixture based on a cement binder, intended for interior and exterior work, meeting increased requirements, with increased resistance to slipping, increased open time and high elasticity.
Dry construction adhesive mixture C1 TE S1, GOST R 56387
Dry construction adhesive mixture C1 TE S2, GOST R 56387
Dry construction adhesive mixture C2 TE S1, GOST R 56387
Dry construction adhesive mixture C2 FE S2, GOST R 56387
Dry construction adhesive mixture C1 FE S2, GOST R 56387
Dry construction adhesive mixture C2 TE S2, GOST R 56387
The symbol of adhesive mixtures must consist of the name of the mixture in accordance with GOST 31189, class designation, values of basic quality indicators (if necessary) and standard designation. Adhesive mixtures are divided into the following classes...
C2 - used for interior and exterior work and meeting increased requirements
S1 – highly elastic mixtures
S2− elastic adhesive mixtures
F – mixtures with extended open time
E – mixtures with increased resistance to slipping
C1 – used for interior and exterior work and meeting the minimum regulated requirements
C0 – used for laying tiles with normal water absorption (at least 5% by weight) only for interior work
T – quick-hardening adhesive mixtures
What requirements must be met for adhesive mortar mixtures (ready-to-use)?
The water-holding capacity of ready-to-use adhesive mortar mixtures must be at least 98%
Resistance to slipping of adhesive mixtures is characterized by the value of displacement under the influence of gravity of facing tiles laid on a vertical or inclined surface. For adhesive mixtures, the offset value should be no more than 1.5 mm.
The average density of adhesive mortar mixtures is set by the manufacturer at the request of the consumer
The water-holding capacity of adhesive mortar mixtures, ready for use, must be at least 85%
The average density of adhesive mortar mixtures must exceed 1800 kg/m3
Resistance to slipping of adhesive mixtures is characterized by the value of displacement under the influence of gravity of facing tiles laid on a vertical or inclined surface. For adhesive mixtures of class T, the displacement value should be no more than 0.5 mm, for mixtures of other classes - no more than 0.7 mm.
Adhesive mixtures must comply with the requirements of the GOST R 56387 standard and be manufactured according to technological documentation approved by the manufacturer. The main indicators of the quality of adhesive mixtures in the hardened state are ...
Open time
Strength of the adhesive bond (adhesion) after exposure to an air-dry environment
Wetting ability
Transverse deformation
Strength of the adhesive bond (adhesion) after exposure to an aqueous environment
Strength of adhesive bond (adhesion) after cyclic freezing and thawing
Strength of adhesive bond (adhesion) after exposure to high temperatures
