The problem that ceramic tile glue appears in practical application

With the rapid development of dry mortar industry in China, the application of ceramic tile glue can be comprehensively promoted. So, what problems will appear in the practical application of ceramic tile glue? Today, help you answer in detail!

A, why to use tile glue?

1) Now ceramic tile market, the brick is doing bigger and bigger

Large tiles (such as 800×800) are easy to sag. Traditional tile bonding generally does not consider sagging, and the sagging of tile by its own weight will greatly reduce the bond strength.

At present, when pasting ceramic tile is generally coated with cement mortar binder on the back of ceramic tile, and then pressed to the wall, leveling ceramic tile by using rubber hammer, because the area of ceramic tile is relatively large, it is difficult to eliminate all the air of cement mortar bond layer, so it is easy to form empty drum, bond is not firm;

2) On the market multi-purpose glass brick water absorption rate is relatively low (≤0.2%)

The surface is smooth, bibulous rate is too low ceramic tile, bond rises more difficult, traditional ceramic tile adhesive already cannot conform to a requirement, that is to say the ceramic tile that sells on the market at present and ceramic tile in the past produced very big change, and the adhesive agent that we use and construction method are very traditional as before however.

Two, the difference between the application of pointing agent and white cement pointing

1) In the long career of filling joints, many decoration teams use cement to fill joints.

2) The stability of white cement is not strong. At the beginning, it feels ok, but after a long time, there will be cracks and cracks between the surface and the side of the ceramic tile.

3) There is also the change of color in wet places, (black and green hair) and cement is water absorption. It still can suck a few dirty thing to reflect in ceramic tile inside, cause discoloration. At the same time, easy to pan alkali.

Three, how to deal with excessive immersion of ceramic tile?

Point to glaze brick commonly, use ceramic tile glue does not need to soak water commonly, construction difficulty is caused after soaking water. If careless excessive soaking, in the premise of not destroying tile glaze, to be dried, and then construction.

Four, split brick, antique brick after joint filling agent pollution treatment

1) It is difficult to clean, the design should consider the use of the same color caulking agent, professional protection measures should be taken before caulking, it is appropriate to use dry hook, and then use special tools slip seam;

2) During construction, after the sealant is cured, brush off the sealant on the surface with a hard brush within 2h, and then clean the surface with a common brush;

3) For the surface contaminated by joint filling agent, it can be cleaned with weak acid and clean with water after 10 days of dry fixation with joint filling agent, without residue.

Five, tile glue immersion and freezing and thawing damage mechanism

1) Fresh water erosion, when water enters, Ca(oH)2 will dissolve out, which will make the structure gradually loose and even destroy;

2) the swelling of the polymer, even if some polymers dry into a film, and then water will absorb water expansion;

3) Interfacial tension: after mortar absorbs water, water will change the interfacial tension of its internal capillary wall and affect the interfacial force;

4) After wet swelling and drying, the volume will expand and contract, resulting in stress failure.

Note: The water in the mortar will freeze and expand when it is below freezing point (coefficient of expansion of ice 9%). When the expansion force exceeds the cohesion strength of mortar, freezing-thawing failure will occur.

Six, 801 glue and glue powder can replace the redispersable latex powder?

Cannot, 801 is apparent to improving construction sex effect, to the performance after ceramic tile glue is hardened, be resistant to water especially, freeze-thaw sex is invalid.

Seven, ceramic tile glue can be used to hook

Unfavorable, because of both performance index is different, ceramic tile glue basically asks caking sex, caulking agent asks flexibility, hydrophobicity and fight pan-alkalinity, 2 syncretic can be accomplished on the market at present, in order to reduce cost.

Eight, ceramic tile rubber powder and HPMC role

Rubber powder – improves the consistency and smoothness of the system in wet mixing state. Due to the characteristics of the polymer, the cohesion of the wet mixed material is greatly improved and makes a great contribution to workability. After drying, the adhesive force of smooth and dense surface layer is provided, and the interface effect of sand and stone and porosity is improved. On the premise of ensuring the amount of addition, the interface can be rich in integrated film, so that the ceramic tile glue has a certain flexibility, reduce the elastic modulus, and absorb water to a great extent the thermal deformation stress. Later, such as water immersion can also have waterproof, buffer temperature, material deformation is inconsistent (tile deformation coefficient of 6×10-6/℃, cement concrete deformation coefficient of 10×10-6/℃) and other stresses, improve weather resistance.

HPMC– provides good water retention and constructability for fresh mortar, especially for wetting area. In order to ensure the smooth hydration reaction can prevent the substrate excessive water absorption and surface water evaporation. Because of its air permeability (1900g/L—-1400g/L PO 400 sand 600 HPMC 2), the tile glue bulk density is reduced, the material is saved and the elastic modulus of hardened mortar body is reduced.

Nine, feel ceramic tile glue can not construction how to do?

1) tile glue is modified dry mixing mortar, its water mixing, compared with the traditional cement mortar will be sticky, the construction personnel have an adaptation period;

2) If the ceramic tile glue with good water mixing appears in the use process of dry solid can not be constructed, mostly caused by static time is too long, should be banned.

Ten. Reasons for the color difference of sealant

1) Color difference of the material itself;

2) Inconsistent amount of water added;

3) Extreme weather after construction;

4) Changes in construction methods.

Other, clean surface layer water consumption is too large, uneven residual water caused by local shallow, excessive acid cleaning agent will also have the above problems.

Eleven, why does glazed tile appear small crack

Because tile glaze is too thin, use rigid ceramic tile glue to undertake stickup, after drying, shrink bigger, meaning pulls crack of glaze to produce, suggest to use flexible ceramic tile glue product.

12, why ceramic tile after sticking can be squeezed broken glaze?

Seam was not left when construction, ceramic tile is affected by heat bilge cold shrink change, produce crack of long turtle shape.

Thirteen, tile glue construction after 2-3D still no strength, press soft by hand, why?

1) Low temperature, no protective measures, difficult to normal hardening;

2) Construction is too thick, the surface hardening internal water is too large shell wrapping effect;

3) The water absorption rate of the base is too low;

4) The size of the brick is too large.

14, after using agent of common cement base ceramic tile to stick brick, how long ability is solidified

Usually need 24h to be able to harden basically, lower temperature or poor ventilation will be extended accordingly.

Fifteen, stone installation 6 months after cracking, the reason

1) Foundation surface settlement;

2) Expansion displacement;

3) Compression deformation;

4) stone internal defects (natural texture, cracks), the phenomenon is only a few pieces;

5) point load or local impact of tile surface;

6) tile glue is rigid;

7) The cracks and joints on the cement backplane are not well handled.

Sixteen, ceramic tile empty drum or fall off the reason

1) tile glue does not match;

2) The rigid base surface does not meet the installation requirements, and there is deformation (such as light partition wall);

3) The back of the brick is not cleaned (dust or release agent);

4) Large bricks are not backcoated;

5) the amount of tile glue is not enough;

6) For the base surface prone to vibration, after paving with a rubber hammer hit too hard, affecting the end of the brick according to the end of the installation, causing the interface loose;

7) Poor flatness of the base surface and different thickness of ceramic tile glue cause poor shrinkage after drying;

8) Paste adhesive after opening time;

9) Environmental change;

10) Expansion joints are not set according to the requirements, resulting in internal stress;

11) lay bricks on the base surface expansion seam;

12) Shock and external vibration during maintenance.

A. Cement is A hydraulic cementing material. Its high compressive strength, elastic modulus and water resistance make it an important component of structural masonry materials. The reason is that the mechanism of the bonding performance is that the cement mortar can penetrate into the pores before the initial setting, condensation and hardening, and play the role of mechanical anchoring similar to the key inserted into the keyhole, so as to bond the covering material and the base material.

The above adhesives have a certain bond to ceramic bricks (15-30%), but according to EN12004 standard culture for 14d +14d 70℃+ 1D, their effect will also be lost. Especially in today’s people use ceramic brick (1-5%) and homogeneous brick (0.1%) mechanical anchoring effect can not play an effective role.

B, cement and 108 glue based binder is in the redispersion of latex powder has not been fully recognized by the people of the transition products, with high elastic modulus, unable to eliminate the internal stress caused by the deformation of ceramic tile and substrate due to contraction, temperature and other factors. Internal stress is not released, bring about ceramic tile to rise finally drum, craze and flake. (As shown in the typical case above)

To sum up, for the multi-layer external insulation system composed of different materials (EIFS\ large mold built-in, etc.), such as the use of brick decoration, in order to ensure its safety, should focus on the matching of elastic modulus between different materials, the flexibility of intermediate adhesive, system permeability, to reduce or eliminate internal stress. Practice has proved that adopting the principle of “compliance” is more guaranteed than simply pursuing the “resistance” method of high bond strength.

Seventeen, ceramic tile glue (cement) mixing process

Feeding: add water before feeding

Stirring: the material added to the water will be initially stirred evenly, stand for 5-10min, make it fully mature, and then stir for 2-3min, in use.

Eighteen, waterproof layer for ceramic tile paste

The different waterproof materials affect the firmness of the ceramic tile paste. If the polyurethane organic waterproof materials are used, the brick is easy to fall out in the late period because of the material incompatibility.

Post time: May-25-2022