What requirements must be met for adhesive mortar mixtures (ready-to-use)?
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%
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%
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.
Material on this issue is presented in the GOST R 56387 .
What requirements must be met for adhesive mixtures in a dry state?
The content of grains larger than 0.63 mm in the adhesive mixture should not exceed 0.50%
The largest grain size of the adhesive mixture should not exceed 0.63 mm.
The amount of cement in the adhesive mixture must exceed 35% of the mass
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 specific effective activity of natural radionuclides of adhesive mixtures should not exceed the limit values established by GOST 30108
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.
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.
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.
Pot life is the period of time after mixing the mortar mixture necessary to achieve readiness for installation.
Material on this issue is set out in the GOST R 56387 .
To mix (dilute, mix) cement adhesive mixtures of class C1, it is necessary to use...
Primer
PVA - emulsion of polyvinyl acetate in water, with a plasticizer and special additives
Water-based latex mixture
Vegetable oil
Adhesive milk
Water
Synthetic oil
Water latex
Material on this issue is presented in technical data sheets for cement adhesive mixtures.
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...
C0 – used for laying tiles with normal water absorption (at least 5% by weight) only for interior work
C2 - used for interior and exterior work and meeting increased requirements
F – mixtures with extended open time
S2− elastic adhesive mixtures
T – quick-hardening adhesive mixtures
S1 – highly elastic mixtures
C1 – used for interior and exterior work and meeting the minimum regulated requirements
E – mixtures with increased resistance to slipping
