The city is constantly developing, and the requirements for the quality of urban buildings are getting higher and higher. For the construction technology of concrete structures there are still many places for people to further improve, we must understand the characteristics of concrete structures and the methods and conditions and precautions for the use of concrete in the construction process. These are the most basic elements that should be available at the beginning of the construction and during the process.
Advantages of concrete structures
Concrete structure is a new type of structure composed of plain concrete structure, prestressed concrete structure and reinforced concrete structure, with concrete as the main material and some other related materials. The concrete used in modern civil engineering construction is also called concrete, which is a mixed cementitious material in which cement, sand, stone, water and other materials are mixed in a certain ratio and then cemented together for the implementation of construction projects in the construction industry.
Concrete is widely used in the modern construction industry, bulk concrete as one of the important materials in civil engineering construction. The reason why it can become one of the more widely used materials in the civil engineering construction industry today is also based on a certain basis, the following authors list some of the advantages of concrete materials themselves.
- Easy to make. Concrete structure in the production and production of the process required is relatively simple, technically difficult and very easy to operate.
- Easy to source. The substances that make up concrete structures are widely available in nature.
3, cheap. Because of the easy source of concrete structure and the simple production process, the price is much lower than other construction materials, and is favored by the construction industry.
4、Stable nature. The durability and fire resistance of concrete structures are very good, in line with the requirements of construction.
5、Good performance. Concrete structure and the brick structure used to be compared, its seismic resistance and adapt to bad weather and natural disasters are better performance.
6, good plasticity. In the process of civil engineering construction, the most used technology is the overall pouring technology, this technology is for the concrete structure and the development of this nature in the project is very convenient to use, and good integrity
7, the performance is easy to adjust, easy to take materials, conducive to meet the use of various types of projects.
8, concrete environmental protection, can use slag, cinder, coal ash and other industrial waste to its production.
The main problems in the construction of concrete structures in civil engineering buildings
There are certain problems in the construction of concrete structures in civil engineering buildings, what are the common problems, and how should we solve these problems is what we will discuss below.
1, the quality of concrete materials is not qualified
With the continuous progress of social technology, China’s construction industry engineering standards are becoming increasingly strict, the past manual mapping technology is not able to meet the requirements of the construction of building quality. In the manual testing of construction materials, often because the procurement staff to purchase materials do not meet the strength requirements of the concrete structure itself or inspector inspection is not strict enough, resulting in a crisis in the concrete structure, which makes it difficult to ensure that the modern concrete structure in the field of civil engineering to play the most beneficial role, pulling down the construction technology level of the building industry and the quality of construction products.
Therefore, strengthen the discussion and research on science and technology, improve the construction technology, insist on the introduction of high-tech equipment required in the construction process has become a realistic situation that cannot be ignored.
2、The technology of blending concrete is not standardized
The first study of concrete is blended in the laboratory, its ratio meets the requirements and can be standardized. The reality of the building in construction may not be able to meet the required standards, the reality of the construction environment there are too many uncertainties, and will not be in accordance with the specific requirements of the ratio as in the laboratory, so there will be differences in strength.
Therefore, more efforts should be made to standardize the process of making concrete, so as to achieve the strength requirements of concrete itself.
3、Concrete is prone to cracks in construction
Concrete structure is composed of different kinds of raw materials, concrete as a construction material, will produce cracks for a variety of reasons, cracking can be said to be “multiple” and “common”, because the cracks have led to a decline in the quality of the project has long been commonplace. . In general, we divide the types of concrete cracks into three categories. First, surface cracks, second, penetration cracks, and third, deep cracks in the structure.
Surface cracks are less important to the safety of the building product, because concrete has good durability and easy to adjust its performance. However, deep structural fractures and penetration fractures are different, they can affect the safety of the concrete structure, the integrity is jeopardized, and repair is more difficult.
The causes of cracks in concrete in civil engineering construction
1, building products due to temperature changes prone to cracks
The concrete used in construction will be affected by the external environment and temperature changes inside the structure, with the characteristics of thermal expansion and contraction, the concrete structure will deform, deformation if hindered, its internal will appear stress, when the stress exceeds the tensile force that can be carried by the concrete structure, it will produce cracks caused by temperature.
2、Cracks caused by foundation deformation of building products
Because the geological structure is complex and unpredictable, and the modern geological exploration technology is not well developed, the survey accuracy needs to be improved. During the construction, the foundation will produce vertical uneven settlement or horizontal displacement, resulting in the production of excess stress inside the structure, and this additional stress exceeds the tensile capacity that the concrete structure can withstand, so the concrete structure produces cracks.
3、Cracks caused by corrosion of reinforcing steel
The surface layer of concrete is susceptible to carbon dioxide carbonation, carbonation will be serious erosion to the surface of the reinforcing steel, resulting in a decrease in the alkaline concentration of the concrete retained around the reinforcing steel, the resulting chloride may be the surface of the reinforcing steel oxide film is broken, thus corroding the reinforcing steel, making the area of the reinforcing steel smaller and smaller, the reinforced concrete contact stress point becomes less, the load-bearing capacity of the structure weakened, generating cracks and damaging the concrete structure.
Optimization analysis of the construction technology design of concrete structures
Before the project is about to start, it is very necessary for us to design the construction technology of the concrete structure in advance. In order to make the civil engineering construction progress faster and more effectively the authors have briefly analyzed this.
1、Strengthen the planning of the concrete structure
The procurement of the formwork should be very careful, and the long-term planning should be carried out strictly in accordance with the formwork before construction, and the formwork should be formulated as a special program for the project, and the program should be implemented only after all audits by professionals. In addition to the formwork, the planning of the construction drawings should also be strictly required, the nodes of the frame should be carefully encrypted and tied, the welding part must be cleaned of welding slag, and the tying of the structural plate should have sure measures to increase the bearing capacity of the structural plate.
2、Concrete mixing and maintenance, standardize the construction of unqualified behavior
In the construction of the project concrete to be tight specifications deployment to ensure that the concrete structure has sufficient strength. The right amount of additives and reinforcing materials are added to effectively control the self-shrinkage value of cement and concrete, and the stronger tensile properties of fibers are conducive to improving the cracking strength of the concrete structure. The construction process should be regularly arranged for inspectors to maintain the concrete in large areas. Maintaining the appropriate temperature and humidity is the key to the maintenance of concrete structures, which will make the tensile strength of the concrete structure bearing greater and reduce the occurrence of problems.
Conclusion.
China’s construction industry follows the society in a booming development. The concrete structure is an important building material in the field of civil engineering, but there are still some problems in the application of concrete structure in the relevant buildings, which needs to be further studied and explored.
In the process of construction technology of concrete structure also contains a lot of disadvantages, which makes the safety of construction projects reduced, which people do not want to see. Therefore, we call on the relevant departments to strengthen the supervision and management of civil engineering construction projects, and to strictly control the quality of construction, so that the future of civil engineering construction in China will be more beautiful.