The terms with their corresponding definitions are listed below. Indicate those for which the match is correct.
Open time - the maximum period of time after applying a layer of mortar mixture of a given adhesion strength to the base on the base, during which it is allowed to lay facing tiles on the applied mortar mixture.
Sliding is the displacement under the influence of gravity of tiles or slabs laid on a layer of mortar mixture treated with a notched trowel applied to a vertical or inclined surface.
Pot life is the period of time after mixing the mortar mixture necessary to achieve readiness for installation.
A notched trowel is a toothed tool that allows you to create a layer of mortar mixture on the base in the form of grooves of the same thickness.
Holding time after preparation is the maximum period of time during which a freshly prepared mortar mixture (after additional mixing without adding water) retains its technological properties.
Adhesion is the ability of a layer of mortar mixture treated with a notched trowel to wet the facing tile.
Material on this issue is set out in the 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...
T – quick-hardening adhesive mixtures
C0 – used for laying tiles with normal water absorption (at least 5% by weight) only for interior work
E – mixtures with increased resistance to slipping
S1 – highly elastic mixtures
S2− elastic adhesive mixtures
F – mixtures with extended open time
C1 – used for interior and exterior work and meeting the minimum regulated requirements
C2 - used for interior and exterior work and meeting increased requirements
Material on this issue is presented in the GOST R 56387 .
What requirements must be met for adhesive mixtures in a dry state?
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
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
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 S2, GOST R 56387
Dry construction adhesive mixture C1 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 S1, GOST R 56387
Dry construction adhesive mixture C2 TE S2, GOST R 56387
What requirements must be met for hardened solutions of adhesive mixtures?
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:
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 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:
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.
