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...
E – mixtures with increased resistance to slipping
S1 – highly elastic mixtures
C2 - used for interior and exterior work and meeting increased requirements
C1 – used for interior and exterior work and meeting the minimum regulated requirements
T – quick-hardening adhesive mixtures
F – mixtures with extended open time
S2− elastic adhesive mixtures
C0 – used for laying tiles with normal water absorption (at least 5% by weight) only for interior work
Material on this issue is presented in the GOST R 56387 .
What requirements must be met for adhesive mortar mixtures (ready-to-use)?
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.
The water-holding capacity of adhesive mortar mixtures, ready for use, must be at least 85%
The average density of adhesive mortar mixtures is set by the manufacturer at the request of the consumer
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, the offset value should be no more than 1.5 mm.
The water-holding capacity of ready-to-use adhesive mortar mixtures must be at least 98%
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 ready for use (freshly prepared) are ...
Minimum Density
Water holding capacity
Resistance to slippage
Open time
Average density
Humidity
Maximum Density
What requirements must be met for hardened solutions of adhesive mixtures?
The strength of the adhesive connection to the base of fast-hardening class F adhesives after exposure in an air-dry environment for 6 hours should be no more than 0.5 MPa
The strength of the adhesive joint after cyclic freezing and thawing must be no less than:
0.5 MPa for C1; 1.0 MPa for C2.
The strength of the adhesive joint after exposure to an air-dry environment for 28 days must be no less than:
0.5 MPa for C0; 0.5 MPa for C1; 1.0 MPa for C2.
The transverse deformation of class S1 adhesives must be at least 2.5 mm, class S2 – at least 5 mm.
The strength of the adhesive joint after exposure to high temperatures must be no less than:
The strength of the adhesive joint after exposure to an aqueous environment must be no less than:
The open time to achieve an adhesive joint strength of at least 0.5 MPa should be for adhesives of the following class:
C0 and F – when gluing tiles after 10 minutes; C1 and C2 – when gluing tiles after 20 minutes; E – when gluing tiles after 30 minutes.
What requirements must be met for adhesive mixtures in a dry state?
The largest grain size of the adhesive mixture should not exceed 0.63 mm.
The content of grains larger than 0.63 mm in the adhesive mixture should not exceed 0.50%
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 moisture content of adhesive mixtures should not exceed 0.30% by weight
The bulk density of the adhesive mixture should not exceed 1600 kg/m3
