In the construction of various building projects, it is always inseparable from the use of cement mortar, concrete and other building materials, and in order to ensure better performance of these materials, it is necessary to mix the appropriate amount of micro silica fume and other adulterants before use, as an adulterant to reduce the gap between cement particles, improve the water loss and strength of cement mortar, the specific surface area of micro silica fume is one of the main parameters to achieve these properties.
So, how to calculate the specific surface area of Mikrosilikastaub?
Silica fume Specific surface area
Refers to the unit weight of micro silica fume raw materials have the surface area, the unit is ㎡/g, divided into two kinds of external specific surface area and internal specific surface area, the ideal non-porous raw materials only external specific surface area, but with the pores of the raw materials also have internal specific surface area.
The large specific surface area of micro silica fume is the key parameter to ensure that it can play a role in water reduction and enhancement of cement. As the micro silica fume, fineness less than 1μm accounted for more than 80%, the average particle size are 0.1 bis 0,3μm, the specific surface area of 20 to 28㎡ per gram, its fineness and specific surface area is about 80 zu 100 mal so viel wie Zement, 50 zu 70 times that of Flugasche.
Silica Fume Fineness
Refers to the coarse and fine degree of powdered raw materials such as micro-silica powder, often expressed in terms of standard sieve percentage or specific surface area, can also be composed of a percentage of particle size, or the average value of the unit weight of the material to indicate that fineness and particles are not strictly distinguishable, but fineness is more customary to indicate the coarse and fine degree of fine powdery raw materials.
Silica fume specific surface area calculation method
After understanding what is the specific surface area of micro silica fume, it can be calculated to determine whether the specific surface area of the micro silica fume sample to be purchased can meet our needs, the specific calculation method is as follows.
First of all, the transmission electron microscope can easily measure the particle size of the micro silica fume sample, the general scale length is 100nm, the sample particle size should be between 10 and 100nm, the average particle size of 30 to 40nm, we take 40nm particle size as an example.
- The volume of the unit micro silica powder calculation: V = 4/3 × π × (40 × 10-9)3 = 2.68 × 10-22m³;
- Calculation of the surface area per unit of micro silica fume: S=4π×(40×10-9)2=2.01×10-14m2;
- The apparent specific gravity of micro silica fume is calculated by 2600 kg/m³, and the number of particles per kg of micro silica fume should be:1/2600÷2.68×10-22=1.44×1018 grains.
Deswegen, the specific surface area of each kg of micro silica fume should be: 1.44×1018×2.01×10-14=29000㎡.
The above is the specific surface area of micro silica fume and its calculation method, Henan überlegene Schleifmittel for you to collate, I hope it can help you buy better micro silica fume products, if you need to buy can leave a message on our website, or send email to sales@superior-abrasives.com for detailed consultation.
