The application of rotary vane vacuum pump in concrete construction can effectively prevent surface shrinkage, improve frost resistance, reduce water cement ratio, shorten flattening, plastering and drawing. The clearance time of mold processing speeds up the turnover of formwork, improves the construction efficiency, reduces the labor intensity, and creates conditions for the concrete mechanical construction. Road engineering, asphalt concrete, cement concrete and other types of pavement works are calculated by multiplying the design length by the design width (including turning area), without deducting the area occupied by various wells.
In this stage, high-rise commercial concrete pumping is widely used in civil construction. The pumping ready mixed concrete has a large slump and a lot of cement slurry. Cracks often occur during construction. Civil engineering is very tight, and the quality requirements are very high. It is suggested that the rotary vane vacuum pump suction technology should be used to achieve good results.
What is the forming principle of vacuum vane vacuum pump for vacuum water absorption?
In the process of vacuum water absorption and water absorption, commercial concrete with high fluidity is used and poured into the mold, and then the rotary vane vacuum pump is used to absorb water. By means of the pressure difference between the atmospheric pressure and the vacuum chamber, the excess moisture in the commercial concrete mixture is discharged. gas station.
When vacuum treatment is carried out, a vacuum is formed in the vacuum chamber on the surface of commercial concrete. The vacuum degree is expressed by vacuum in PA. With the extension of vacuum treatment time, some moisture and air in commercial concrete are discharged, the solid particles are close to each other, the water is continuously extruded, the cement slurry is concentrated, the water cement ratio is reduced, and the commercial concrete is increasing. For the commercial concrete after vacuum water absorption treatment, the residual water cement ratio is not less than 0.3, which will not affect the normal hydration of cement.
Through the application of rotary vane vacuum pump suction technology in engineering, the technology has the following characteristics:
1. Speed up the construction. The vacuum type commercial concrete adopts the flowing commercial concrete mixture, which has large slump, short vibration time and convenient operation. After vacuum adsorption, it can be applied immediately to shorten the static time, reduce the influence of seasons and climatic conditions, and shorten the construction period.
2. improve the quality of flooring components. The floor adopts vacuum suction technology, and the commercial concrete has compact structure, high strength, uniform material, beautiful appearance and quality assurance. In addition, extreme smoothness, compaction and slurry upgrading can greatly improve the durability of commercial concrete surface, such as wear resistance, impermeability and crack resistance.
3. Improve working conditions. Using mechanical smoothing and daubing instead of manual operation can reduce labor intensity and improve efficiency. Due to the use of fluid commercial concrete, the long-term strong vibration is avoided, the noise is reduced, and the working environment and operating conditions are improved.
4. Save raw materials and reduce project cost. Compared with the ordinary production process, the vacuum water absorption process increases the cost of vacuum adsorption equipment, but reduces the cost of template leasing; the construction speed is fast, which can greatly reduce the production cost.
This paper mainly introduces the application method of rotary vane vacuum pump in concrete construction. Adopting vacuum suction technology on the engineering floor can better control the surface cracking phenomenon, reduce the initial water cement ratio and improve the commercial concrete. The compactness accelerates the construction speed and achieves certain economic benefits. Vacuum water absorption technology of commercial concrete is an advanced technology to improve engineering quality and speed up construction progress. After watering, vibrating and smoothing, put the suction cup on the surface of commercial concrete, start the vacuum equipment, and suck free water from the commercial concrete. A method to reduce the water cement ratio of commercial concrete. It has been widely used in roads and large industrial plants, airports, ports, dams and other projects.