Types of concrete cracks What are the treatment methods for concrete cracks?

The choice of specific structure is helpful to determine the later effect and experience of users to some extent. If the wrong choice is improper, it will often cause great losses, and it will also have a multiplier effect on consumers. Therefore, even non-professionals, it is necessary to know the basic knowledge about concrete structure, including its classification information, the treatment and operation steps of cracks in concrete structure, and further study can be carried out in combination with the actual situation.

A brief introduction to concrete structure

Concrete structure (concrete? Structure), a structure mainly composed of concrete. Including plain concrete structure, reinforced concrete structure and prestressed concrete structure. "concrete" (sound tóng) is synonymous with "concrete" and can be used together, but in the same technical documents, drawings, books and periodicals, the two should not be mixed.

1, advantages

Compared with other materials, the advantages of concrete structure are as follows: good integrity, which can be poured into a whole; Good formability, and can be cast into structures of various shapes and sizes; Good durability and fire resistance; The engineering cost and maintenance cost are low.

2. Deficiencies

The shortcomings of concrete structure are as follows: the tensile strength of concrete is low, and some reinforced concrete floors are used. Easy to produce cracks; The weight of the structure is greater than that of the steel-wood structure; Outdoor construction is limited by climate and season; The old and new concrete are not easy to connect, which increases the difficulty of reinforcement and repair.

In addition, the construction technology of concrete structure is complex and has a long period, which is greatly influenced by seasons and climate. Once damaged, it is difficult to repair. The thermal insulation and sound insulation performance of concrete is also very poor.

Second, the concrete structure crack treatment

1, surface repair method

Compared with other centralized repair schemes, surface repair is the simplest and most practical, but the cracks repaired are all cracks on the external surface of the entity. This kind of crack has no influence on the safety and bearing capacity of the structure, and is generally used after the decoration is completed. This general treatment measure is to repair cracks according to the decoration materials used on site. If site conditions permit, glass fiber cloth, kraft paper, etc. can be added to the cracks. Therefore, the surface repair method is the simplest, practical and easy-to-operate crack repair scheme.

2. Grouting mosaic method

Grouting method is a common method for cracks with large cracks, but the structure is not easy to chisel and dismantle, which directly affects the safety and use function of the structure. This treatment scheme is to use high-pressure equipment to press the grouting cementing material into the cracks of commercial concrete, so that the injected cementing material and the commercial concrete structure can be hardened to form a whole, thus achieving the purpose of plugging the cracks. In the actual construction process, the main materials used in high-pressure grouting to plug cracks are epoxy resin, polyurethane and cement slurry. Grouting method uses high-pressure grouting machine in the process of treating cracks and sealing cracks, which has certain requirements for workers' operation level and quality.

Joint filling method is a treatment scheme for cracks with large cracks but not deep and incomplete. After gouging along the cracks, the cracks should be caulked and sealed along the grooves. This treatment scheme requires high performance of materials and high adhesion to the materials on the surface of grooves. In the construction process, the commonly used materials for caulking treatment scheme are polymer cement mortar, ointment, PVC cement and so on.

3. Structural reinforcement methods

Structural reinforcement method requires high construction. When the cracks directly do great harm to the safety performance of the structure and affect the normal use, the crack treatment scheme is adopted. There are many kinds of structural reinforcement methods, the main principle of which is to improve the bearing capacity of structural members to compensate the influence of cracks on them. In the field construction, the commonly used structural reinforcement methods include: increasing the cross-sectional size of commercial concrete structure, wrapping the edge with steel, sticking steel plates, and increasing support points to increase the bearing capacity of structural members.

4, commercial concrete substitution method

When excessive cracks affect the original performance of the structure, can not meet the bearing capacity requirements of the structure, resulting in structural safety hazards, it is necessary to replace the original commercial concrete. Among many crack treatment schemes, the replacement method of commercial concrete is complicated, and the judgment and identification of cracks need to be considered comprehensively. It is best to rebound the original commercial concrete structure only when it can't meet the design requirements. This method is complicated, it needs to dismantle the commercial concrete of the original structure, which is easy to destroy the safety of the structure and has a large amount of commercial concrete. Replaced commercial concrete is often replaced by commercial concrete which is one grade larger than the original design, and micro-expansive agent is infiltrated to avoid damaging the original steel bars when removing commercial concrete.

The above information about concrete structure is practical information with reference value and significance, including its classification knowledge, further measures and methods, such as concrete structure crack treatment skills, reasons, precautions and so on. It is not difficult to know that an excellent concrete structure should be a humanized product that takes into account all kinds of situations and should be able to strengthen the characteristics of safety and practicality. Only in this way can it help play a key role.