1. Chemical composition detection Quality test standard for micro silica powder 92
- Test items:
Silica (SiO₂)
The SiO₂ content of microsilica powder 92 should be ≥92%. This is its most critical indicator and represents its main active ingredient.
Carbon content (C)
The carbon content should usually be in the range of 1%-3%, and high carbon content may affect its performance in concrete.
Alumina (Al₂O₃) and iron oxide (Fe₂O₃) content
These two components are impurities, and the total amount is generally required to be less than 2%-3% to ensure high purity.
Calcium oxide (CaO)
CaO content is usually required to be less than 1% to avoid unnecessary expansion due to chemical reactions.
Potassium oxide (K₂O) and sodium oxide (Na₂O)
The total alkali content (K₂O + Na₂O) is generally less than 1%. High alkali content may affect the durability of concrete.
- Detection method:
X-ray fluorescence spectroscopy (XRF) is often used to detect the specific content of chemical components.
2. Physical performance test Quality test standard for micro silica powder 92
- Test items:
Specific surface area
The specific surface area of microsilica powder is generally between 15-30 m²/g. The higher the specific surface area, the stronger the reactivity.
Particle distribution
The average particle size is usually 0.1-0.5 microns, and the proportion of fine particles should account for the majority in order to improve the filling effect and chemical activity.
density
The true density is generally 2.2-2.5 g/cm³, and the bulk density is 200-400 kg/m³.
mobility
If used in concrete, its effect on concrete fluidity needs to be tested, usually characterized by slump loss.
- Detection method:
The specific surface area can be determined by BET method.
Particle distribution can be detected using a laser particle size analyzer.
3. Activity index Quality test standard for micro silica powder 92
- Test items:
Volcanic ash activity index
The activity index of micro-silica powder is the key performance index in concrete. The standard stipulates that the activity index of micro-silica powder 92 should be ≥105% (based on the strength of the reference cement).
Compressive strength ratio
The compressive strength of the specimen containing micro-silica powder is compared with the benchmark specimen, and the strength ratio of 28 days should be ≥105%.
- Detection method:
Prepare concrete specimens and test the compressive strength according to standard methods (e.g. GB/T 50081-2019 "Standard for Test Methods of Mechanical Properties of ordinary Concrete").
4. Moisture content Quality test standard for micro silica powder 92
The moisture content is usually less than 3%. Excessive moisture content may lead to caking in storage and use.
- Detection method:
Moisture content was determined by drying method (according to GB/T 10277).
5. Impurity content Quality test standard for micro silica powder 92
Unburned material (LOI)
The content of unburned matter is usually ≤6%, and too high a content may affect the setting and hardening of cement.
Fineness
The 45 micron screening rate should be less than 10% to ensure the fineness of the micro-silicon powder.
- Detection method:
LOI was determined by high temperature burning method.
6. Environmental and health indicators Quality test standard for micro silica powder 92
- Radioactivity index
The limits of radionuclides in microsilicon powder should comply with GB 6566 standard to ensure its environmental protection and safety.
- Heavy metal content
The content of heavy metals (such as lead and cadmium) must meet environmental requirements, especially when used in drinking water engineering or food-related fields.
7. Other performance tests Quality test standard for micro silica powder 92
- Colour
Microsilica powder 92 is generally grayish white to dark gray, and the color does not affect the performance but can be used to initially identify the purity of the product.
- Water absorption
The water absorption of micro-silica powder is related to its particle fineness and specific surface area, and its influence on the slump loss of concrete is usually tested.
Test reference standard Quality test standard for micro silica powder 92
- Chinese standard:
GB/T 27690-2011 "Silica Fume"
GB/T 50081-2019 Standard for Test Method of Mechanical Properties of Ordinary Concrete
- International standard:
ASTM C1240: Standard Specification for Silica Fume Used in Cementitious Mixtures
EN 13263: Silica Fume for Concrete
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