Densified Silica Fume （Micro Silica) 85 Light Grey
Core advantages :
1. High strength
2. Low water demand
3. High cost-effectiveness
4. High bulk density
which can effectively improve the comprehensive performance of concrete while reducing the overall construction and transportation cost, reducing construction difficulty and improve the working performance of concrete, which complies with GB/T 27690-2023, ASTM C 1240, and corresponding European standards (EN 13263).
Item | Unit | Standard/Technical Requirement | Test Result |
Silicon Dioxide (SiO₂) Content | % | ≥85.0 (GB/T 27690-2023)<br>≥85.0 (ASTM C 1240)<br>≥85.0 (EN 13263) | 86.32 |
Moisture Content | % | ≤2.0 (GB/T 27690-2023)<br>≤3.0 (ASTM C 1240)<br>≤2.0 (EN 13263) | 0.1 |
Loss on Ignition (LOI) | % | ≤4.0 (GB/T 27690-2023)<br>≤6.0 (ASTM C 1240)<br>≤4.0 (EN 13263) | 2.43 |
Fineness (Residue on 45 μm sieve) | % | ≤5.0 (GB/T 27690-2023)<br>≤10.0 (ASTM C 1240)<br>≤5.0 (EN 13263) | 2.4 |
Specific Surface Area | m²/kg | ≥15000 (GB/T 27690-2023)<br>≥15000 (ASTM C 1240)<br>≥15000 (EN 13263) | 25610 |
Water Demand Ratio | % | ≤125 (GB/T 27690-2023)<br>≤125 (ASTM C 1240)<br>≤125 (EN 13263) | 101 |
Total Alkali Content (Na₂O+0.658K₂O) | % | ≤1.5 (GB/T 27690-2023)<br>≤2.0 (ASTM C 1240)<br>≤1.5 (EN 13263) | 1.2 |
Radioactivity - Internal Exposure Index (Iₐ) | - | Iₐ ≤1.0 (GB/T 6566-2010)<br>(Not specified in ASTM/EN, regional requirement) | 0.13 |
Radioactivity - External Exposure Index (Iᵧ) | - | Iᵧ ≤1.0 (GB/T 6566-2010)<br>(Not specified in ASTM/EN, regional requirement) | 0.18 |
Activity Index (7d) | % | ≥105 (GB/T 27690-2023)<br>≥105 (ASTM C 1240)<br>≥105 (EN 13263) | 118 |
Alkali-Aggregate Reaction Inhibition | % | 14d expansion reduction ≥35 (GB/T 27690-2023)<br>(Not specified in ASTM/EN) | 65 |
Chloride Ion Content | % | ≤0.02 (GB/T 27690-2023)<br>≤0.01 (ASTM C 1240)<br>≤0.02 (EN 13263) | 0.016 |
Chloride Ion Penetration Resistance (28d electric flux ratio) | % | ≤40 (GB/T 27690-2023)<br>(Not specified in ASTM/EN) | 32 |
Standard Compliance Notes
• Chinese Standard (GB/T 27690-2023): All test results meet the mandatory requirements of the latest national standard for silica fume for cement and concrete.
• American Standard (ASTM C 1240): The product meets or exceeds the key performance requirements of ASTM C 1240, with minor differences in allowable limits for moisture content, LOI, and total alkali content that are fully satisfied by the test results.
• European Standard (EN 13263): The product aligns with EN 13263 specifications for silica fume in concrete, matching the strict limits for fineness, specific surface area, and chloride ion content.
Typical Applications
• High-strength, high-performance concrete (HPC/HSC) for bridges, dams, high-rise buildings
• Shotcrete and tunnel lining concrete
•Oil well cement and geothermal well cement
• Refractory castables and monolithic refractories
• Self-compacting concrete (SCC)
• Marine concrete and corrosion-resistant structures
• Dry-mix mortar and grout
Recommended Usage & Dosage
• Concrete: 5% - 10% by mass of cementitious material (cement + fly ash/slag)
• Refractory Materials: 8% - 15% by mass of binder
• Mortar/Grout: 5% - 12% by mass of cement
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