Application And Development Of High Performance Concrete Technology

2022-04-20

Concrete technology has entered the era of high-tech development, and the functions of modern buildings are constantly expanding, which puts forward higher and updated requirements for concrete, and needs to be applied and developed in the direction of high performance with higher strength, work performance and durability. Therefore, it is necessary to ensure energy conservation and ecological balance based on the rational application of resources. To a certain extent, "green commercial performance concrete" and new buildings are the development directions of high performance concrete in the future. In particular, a variety of "new cementitious materials, mineral admixtures, new superplasticizers and other admixtures" have been developed and applied in concrete, which enhances the working performance, mechanical performance and durability of the production, forming a high-performance concrete. The research and application of high performance concrete has received extensive attention from civil engineering circles at home and abroad.

1. Research On High Performance Concrete

High performance concrete has the characteristics of "easy pouring and tamping without segregation, good mechanical properties, good toughness, good volume stability, high early strength and good homogeneity", and its service life and time are relatively long under harsh conditions. According to relevant researches: High-performance concrete is developed on the basis of modern high-strength concrete. The use of new superplasticizers and mineral admixtures is the main technical measure to achieve high performance of concrete. The former can reduce concrete's water-binder ratio and increase the slump, control the slump loss, and improve the compactness and workability of the concrete; the latter can fill the pores of the cementitious material and participate in the hydration of the cementitious material, in addition to improving the compactness of the concrete , but also improve the interface structure of concrete, improve the strength and durability of concrete". High-performance concrete improves the technical performance of ordinary concrete to a certain extent, emphasizes the conservation of resources and energy, and requires the effective use of industrial waste to achieve the purpose of environmental protection. It has been widely used and promoted the healthy development of commercial performance concrete technology. However, at present, the geotechnical circles at home and abroad are in-depth research and analysis of high-performance concrete. Different scholars emphasize the different properties of concrete, and it is difficult to have a unified definition. For example, scholars in the United States and Canada, represented by Mehta, pointed out the high strength and high durability of high performance concrete, and claimed that the application of high performance concrete technology can prevent the corrosion of the built structure, because the commercial performance concrete has a good internal structure, has some homogeneity and compactness, and has a good overall workability and stability. In Japan, scholars mainly emphasize the high strength, ultra-high strength and high fluidity of high-performance concrete. Because of the lack of construction personnel in Japan, the labor cost is generally expensive, and the vibration of concrete construction will increase the volatility of concrete quality. In order to reduce this volatility and construction noise pollution, achieve energy saving, environmental protection and other purposes, the fluidity of high-performance concrete and the compactness of construction are emphasized.

2. Properties Of High Performance Concrete

Commercial performance concrete is used more and more in super high-rise buildings, bridges, highways, new buildings, etc. Since the introduction of high-performance concrete technology by Tsinghua University, high-performance concrete has received unprecedented attention, research and application in China. Including reactive fine powder concrete, smart high-performance concrete, fiber concrete and vibration-free self-compacting concrete, etc., enhance the filling, compactness and uniformity of concrete, and the application of high-performance concrete technology in specific projects can effectively improve concrete quality, improve concrete construction operations, support construction noise and increase labor productivity, speed up construction progress, reduce project costs, etc.

3. Development Analysis Of High Performance Concrete Technology

Ordinary concrete deteriorates prematurely. In the mid-1980s, mainly developed countries carried out research on "improving the durability of concrete materials". The design of concrete structures was standardized from the perspective of durability design, with equal emphasis on strength and durability. Later, the concrete design method became the research focus of domestic and foreign civil engineers, in order to reduce the erosion in different environments to strengthen the concrete durability research and service life design. At present, the application of high-performance concrete in super high-rise buildings, new buildings, bridges, highways, etc. is increasing. Taking new buildings as an example, high-performance concrete technology is applied to reinforced concrete structures, because contemporary new buildings are mainly high-rise buildings, and the section below the columns of such new buildings will increase if ordinary concrete is used. The application of high-performance concrete technology can effectively save the cost of materials, and the use of concrete structure is conducive to improve the construction speed of the entire project. Furthermore, the research, development and application of commercial performance concrete has also broken through the limitations of traditional concrete technology, and has a positive role in promoting "energy saving, engineering quality, engineering economy, environment and labor protection, etc." The application of concrete technology in construction engineering will become more and more extensive, and more technical and economic benefits will be achieved, but in-depth research and analysis of "the scientific classification and quality standards of mineral fine admixtures and their relationship with concrete admixtures" are still needed, and effectively enhance the performance of concrete from the nature of the material, and actively develop green high-performance concrete technology. direction development.

4. Conclusion

To sum up, the high-performance concrete technology, which is easy to pour and compact without segregation, good mechanical properties, good toughness, good volume stability, high early strength and good homogeneity", has a long service life under harsh conditions and is used in super high-rise buildings. There are more and more applications in buildings, bridges, highways, new buildings, etc. The research on high-performance concrete needs to be deeply studied so as to ensure the development of green, energy-saving and ecological high-performance concrete technology.

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