What Is The Role Of Micro Silica Powder (Silica Fume) In The Application Of Refractory Materials And Thermal Insulation Materials?

In the construction industry, Ewende micro silica powder can play a variety of important roles as cement or concrete admixture, as well as additives for refractory materials and thermal insulation materials, etc., as follows:

1. Improve compressive, flexural, impermeable, anticorrosive, anti-impact and wear-resistant properties:

    Fill the pores between the cement particles, and hydration products to generate a gel, so that the concrete or refractory material is more dense, and enhance its ability to resist various external forces and erosion;

2. Water retention and prevention of segregation, water secretion:

    Significantly reduce the resistance of concrete pumping, improve the compatibility of concrete;

3. Prolonging the service life of concrete:

    Especially in the harsh environment of chloride salt pollution erosion, sulfate erosion, high humidity, etc., it can make the durability of concrete double or even several times;

4. Reduce the falling ash of spray concrete and casting material, and improve the thickness of single spray layer:

    Reduce the waste of materials and improve the construction efficiency;

5. It is a necessary ingredient for high strength concrete:

    C150 concrete has already been used in engineering applications;

6. Has about 5 times the effect of cement:

    It can reduce the cost and improve the durability when applied in ordinary concrete and low cement casting material;

7. Effectively preventing the occurrence of concrete alkali aggregate reaction:

    Avoiding concrete cracking and damage due to alkali aggregate reaction;

8. Improve the densification of castable refractories:

    When coexisting with Al₂O₃, it is easy to generate mullite phase, so that its high-temperature strength and resistance to thermal vibration are enhanced;

9. Strong volcanic ash effect:

    When mixing concrete, it can have a secondary hydration reaction with Ca(OH)₂, a cementitious product, fill the structure of cement stone, improve the micro structure of the paste, and improve the mechanical properties and durability of the hardened body;

10. Improve the rheological properties of concrete:

      Micro silica powder is amorphous spherical particles, which can improve the fluidity and plasticity of concrete;

11. Filling effect:

     Its average particle size is small, which can be filled in between the cement particle voids, further improving the strength and durability of concrete.

   In the actual application, it is necessary to reasonably determine the mixing amount and use method of micro silica powder according to the specific engineering requirements and material properties. At the same time, the use of micro-silica powder also need to pay attention to construction safety, to avoid silica dust flying.