How to deal with cracking at the junction of concrete components and masonry

It is normal for concrete components to have cracks in the contact surface with masonry, we generally paste not less than 80 grams of alkaline glass fiber mesh cloth at the joints when plastering, paste a cushion layer, paste a surface layer, and under normal circumstances, the plastering surface will not crack again. If the masonry wall is only built, it is best to maintain it for a few days, and wait for the water in the masonry to be lost to less than 10% before the plastering process can be carried out, otherwise the joints between the masonry and the concrete component will crack.

Paste the iron sheet template at the crack and pour the adhesive material from the top of the crack. (track cement, epoxy cement slurry, mortar) after solidification, remove the iron sheet template.

If it is serious, it should be demolished and re-built, and it is not serious to use high-grade cement mortar to fill the joints.

The contact between the column and the infill wall is provided with steel wire mesh.

If it is a hollow brick, the bottom 3 skins are made of solid bricks.

The side that is connected with the main structure is masonry into a horsetooth chauffeur, and the 3 bricks under the beam should be completed 7 days after the lower part is laid, and the oblique masonry method is completed.

Chopped, nailed iron nets, from new powder.

This is a common disease in construction, and it is a frequent disease. The question you mentioned is not detailed, is it the exterior wall or the interior wall? How big is the crack? The approach is not the same.

The cracking treatment of the connection between the concrete component and the masonry is as follows: 1. For plastic cracks and dry shrinkage cracks, as long as it is confirmed that its width is exceeded, the crack depth has not yet reached the depth of the protective balance layer, and the crack has been in a static state, in order to ensure the safety performance and durability of the building and the service life, it must be repaired and restored. The repair method can be used by surface sealing method, and the operation steps are as follows:

1. Use a wire brush or angle grinder with a diamond angle grinder to polish the crack in a range of not less than 20mm, the purpose is to remove the carbonized part and pollutants on the concrete surface, and the grinding depth is 1 Use absorbent cotton silk dipped in acetone or alcohol to scrub the sanded area to remove concrete powder and dust. 3. Deploy epoxy quartz mortar, and require the quartz sand to be dry and dusty, and the particles with a particle size greater than 50% of the total weight are not more than 50%; The ratio of epoxy resin and curing agent is according to the requirements of the use of curing agent; The amount of quartz sand is mixed according to workability. 4. Brush a layer of epoxy slurry on the surface of the grinding area around the crack to facilitate the combination of the post-wipe material and the concrete.

5. Use a special trowel tool to wipe the prepared epoxy mortar on the surface of the crack, and then carry out the decoration work and post-construction after the mortar is cured. For plasticity.

Summary. Concrete cracks will cause leakage in hydraulic buildings, and the result of leakage, on the one hand, the cracks will gradually widen and develop under the action of pressure water; On the other hand, when water penetrates into the concrete, it will first cause hydrolytic failure, which may lead to the destruction of concrete structures.

What are the hazards of cracks in concrete structures and how to deal with them.

Concrete cracks will cause leakage in hydraulic buildings, and the result of leakage, on the one hand, the cracks will gradually widen and develop under the action of pressure water; On the other hand, when water penetrates into the concrete, it will first cause hydrolytic failure, which may lead to the destruction of concrete structures.

According to the survey, seepage water accounts for 60% of the various adverse outcomes caused by cracks

Because the carbonization of concrete will exacerbate the shrinkage and cracking of concrete, it will lead to the destruction of concrete structures. The existence of cracks in concrete can make carbon dioxide in the air easily penetrate into the inside of concrete and interact with some hydration products of cement to form calcium carbonate, which is often referred to as concrete carbonization.

The cracks of the concrete will also weaken the protective effect of the concrete on the steel bar, and in the crack position, the water tensile property will be weakened, and the crack will be further expanded, forming a greater hazard.

The treatment methods for concrete cracks are as follows:1Surface Treatment:

If it is a very shallow and fine static crack, then it can be repaired by surface patching. 2.Grouting method:

Large and small gaps are treated with grouting. 3.Filling method:

Just buy the materials for repairing and then fill the gaps.

Renovation companies and hardware stores will have this material.

If you can't buy it near you, you can also go to JD.com, **of** to have a look.

The self-built house covers an area of 60 square meters, 4 floors, about meters high, construction began in July last year, 2 rooms, all cast-in-place concrete, now one of the rooms 3 4 layers of concrete floor wall around a circle of cracks, the crack trend is getting longer and more obvious, there are no cracks in the upper and lower mouths of the wall and the window door, there are no cracks in the 1 2 floors of the house, I am very worried about safety, I don't know what the situation is?

This may be caused by construction. Because the construction workers are not professional, the ratio is incorrect.

It shouldn't be a problem with the material, if it's a problem with the material, there can't be only one place.

That's the problem with construction.

In other places, there are small cracks on each floor of the floor, which will seep water, and there are many small cracks of about 20 cm under the beams, and there are more and more cracks, some people say that it is caused by the sinking of the ground.

The quality of your self-built house is simply substantial.

I don't recommend you to live anymore.

This gap may become more and more numerous, bigger and bigger, and it is dangerous.

Who is responsible for this construction?

1) Design: In the design, do a good job in geological exploration, pay attention to foundation treatment, set reasonable settlement joints, and avoid block wall cracks caused by uneven settlement of the foundation. For the architectural design plane layout should be regular and straight, the vertical and horizontal wall layout should be uniform and symmetrical, reasonable structural measures should be adopted, the stiffness of the foundation ring beam should be strengthened, and the coordination ability of the foundation to the settlement and deformation of the building should be enhanced, so as to improve the integrity of the building and the ability to resist lateral force.

Attention should be paid to the cracks of the concrete hollow block wall caused by temperature changes and other reasons, and the design should be fully considered to slow down and eliminate the thermal expansion and cold contraction power source, enhance the resistance of the relevant masonry, and improve the crack resistance of the plastering. (2) In terms of construction, it is necessary to grasp the plastering time and plastering thickness of the wall. Generally, the wall should be allowed to shrink and stabilize before plastering and decorating the interior and exterior walls. The thickness of the wall plastering should be uniform.

After the completion of the construction of the structural layer of the Xunpei roof panel, the laying of the thermal insulation layer should be carried out as soon as possible. Reduce the time of direct sunlight on the roof to avoid cracks caused by temperature differences. The handling process of the block must be handled gently, and the barbaric loading and unloading must be strictly prevented to prevent the stress that cannot be released for a while due to the internal injury of the block, and it is required to be stacked neatly, covered with waterproof items, and it is strictly forbidden to rain.

When constructing the top layer, the inner plastering of the top layer should be carried out after the construction of the roof insulation layer and thermal insulation layer is completed to reduce the impact of temperature difference. The plastering of the exterior wall should be constructed after the main structure is capped and after the wall shrinkage tends to be stabilized to prevent the ash layer from cracking in the future; (3) Management: In management, we must start from all aspects, quality, personnel, and materials are the focus of management.

For the construction personnel, to improve the quality of the personnel, the construction personnel to master the time and specific knowledge, to master the wall plastering time and plastering thickness. Generally, the wall should be allowed to dry and shrink to the rear of Emperor Wen before the interior and exterior walls can be plastered and decorated. The thickness of the wall plastering should be uniform, and the masonry workers should do a good job of technical disclosure before taking up their posts, and the same part of the wall of each layer should be constructed by the same person.

In terms of materials, it is strictly forbidden to use broken bricks and broken bricks for masonry. The masonry mortar must be cut according to the requirements of the mix ratio, and the fullness of the mortar must be strictly controlled; The fullness of the mortar is required to reach more than 95%, and the tie bar of the embedded column is pre-embedded according to the regulations.

In construction engineering, cracks often occur at the junction of the exterior wall structural beam and the masonry wall, mainly due to the fact that the cement mortar between the bricks and bricks is subjected to the gravity of the upper brick masonry before it reaches its due strength, resulting in the deformation of the exterior wall and the final formation of cracks

1.With the crack as the center, use a cutting machine to cut a groove in the plastering layer, with a width of 300, and chisel the plastering layer to ensure that the plastering layer outside the incision is not affected and hollowed.

2.In the lower mouth of the concrete beam is slotted, the width is 200mm 300mm, and the depth is about 50mm ash groove.

3.Use an air compressor pump (or other tools: such as a leather tiger, etc.) to blow out the dust in the tank.

4.Fill the material with good elasticity (scattered such as: waterproof elastic putty, etc.) layered filling (after the hardening of the front layer, fill the second layer in the second layer, and so on, and the third layer fills the concrete beam surface), with a thickness of 10mm 20mm.

5.Hang the steel wire mesh (i.e. barbed wire), and fix the steel wire mesh on the wall with cement nails or instant adhesive, and the nail distance is about 250mm.

6.Scrape anti-cracking mortar, layer scrape anti-cracking mortar twice, and sandwich fiberglass mesh inside.

Scrape the exterior wall putty twice, roll the primer after sanding, and roll the topcoat after the primer is air-dried.