What Are The Advantages Of The Application Of Micro Silica Powder (Silica Fume) In Railroad Engineering?

The advantages of the application of Ewende micro silica powder in railroad engineering are reflected in the following aspects:

1. Improvement of concrete properties:

- Strength enhancement: micro silica powder can fill the pores between cement particles and react with the hydration products of cement to generate high-strength calcium silicate gel, thus significantly increasing the compressive and flexural strength of concrete. This is of great significance for the enhancement of the load-bearing capacity of railroad track slabs, bridges, tunnel linings and other structures, which can guarantee that the railroad can withstand the repeated loads of the train in the process of long-term use. For example, in the production of ballastless track slabs of some high-speed railroads, the strength of concrete mixed with micro silica powder can meet the design requirements and ensure the stability of track slabs.

- Improvement of durability: It can reduce the permeability of concrete, reduce the intrusion of water and harmful substances (such as chloride ions, sulfate ions, etc.), improve the permeability, frost resistance and chemical erosion resistance of concrete, and prolong the service life of the concrete structure in the railroad project. In some areas with harsh climatic conditions and aggressive media, the use of micro silica powder can effectively guarantee the durability of railroad projects.

2. Optimize the construction performance:

- Increase cohesion: the micro-nano particles of micro-silica powder can increase the cohesion of concrete, so that the concrete is not easy to segregation, water secretion and other phenomena in the process of mixing, transporting and pouring, to ensure the uniformity and stability of the concrete, and to improve the quality of construction. In the sprayed concrete construction of the railroad tunnel, the cohesive concrete can better adhere to the tunnel wall, reduce the rebound amount, improve the construction efficiency.

- Reduce pumping resistance: its lubrication can improve the fluidity of concrete, reduce the resistance of the pumping process, so that the concrete can be smoothly transported through the pipeline to the designated location, especially for railroad bridges and other high-altitude or long-distance conveying of concrete projects, which can reduce the difficulty of construction and wear and tear of pumping equipment.

3. Facilitate the construction of tunnel projects:

- Improve the quality of shotcrete: In tunneling projects, shotcrete is a commonly used support method. The mixing of micro silica powder can significantly improve the early strength of shotcrete, so that it can form the supporting structure faster and shorten the cycle time of tunnel construction. At the same time, it can also reduce the rebound rate of shotcrete, reduce the waste of materials and construction costs, and increase the thickness of one-time molding of shotcrete to improve the integrity and stability of tunnel support.

- Adaptation to complex geological conditions: For some tunnels with complex geological conditions, such as soft rock tunnels and crushed zone tunnels, micro silica powder can improve the toughness and deformation resistance of concrete, so that the supporting structure can better adapt to the deformation of the surrounding rock, and improve the safety of the tunnel.

4. Cost saving:

- Reduce the amount of cement: under the premise of ensuring the performance of concrete, micro silica powder can partially replace cement. Due to the high activity of micro silica powder, it can play a similar cementing role as cement, so it can reduce the amount of cement and lower the material cost.

- Reduction of maintenance cost: As micro silica powder improves the durability of concrete, it reduces the number of repairs and maintenance during the use of the railroad project, thus reducing the long-term operating costs.

5. Environmental benefits:

- Utilization of industrial waste residue: micro silica powder is a by-product of industrial production (e.g. smelting of ferrosilicon alloy or industrial silicon), and its application in railroad engineering can realize the reuse of industrial waste residue and reduce the pollution of waste residue to the environment, which is in line with the requirements of sustainable development.

- Reducing energy consumption: Improving the strength and durability of concrete can reduce the volume and weight of concrete structures in railroad engineering, thus reducing energy consumption in the construction process, such as transportation, lifting and other aspects of energy consumption.