Sampson BK85 semi-densified micro silica powder is a high-activity pozzolanic by-product derived from metal-silicon smelting. As a high-performance functional additive for cement-based materials, it effectively fills micro voids among aggregate particles, reduces water demand of concrete and mortar mixtures, and significantly improves compressive strength, compactness and durability after curing.
This product is widely applied in high-strength concrete, precast components and special mortar, effectively optimizing working performance and long-term service life of cement-based engineering projects. The semi-densified process balances low dust emission and excellent dispersity, convenient for transportation, storage and on-site mixing.
Technical Specifications
| Feature | Details |
| Product Model | BK-85 Semi-Densified |
| SiO₂ Content | ≥ 85% |
| Loss on Ignition | ≤ 6.0% |
| Moisture Content | ≤ 3.0% |
| Water Demand Ratio | ≤ 125% |
| Specific Surface Area | ≥ 15000 m²/kg |
| Activity Index | ≥ 105% |
| pH Value | 4 – 8.5 |
| Bulk Density | 400 – 550 kg/m³ |
| Packing | 25 kg kraft bag / 1000 kg jumbo bag |
| Standard | GB/T 27690-2023 |
Strengths
- High Pozzolanic Activity: greatly improves compactness, mechanical strength and anti-permeability of concrete and mortar products.
- Water Reduction & Workability: lowers mixture water demand, improves construction workability and enhances early green body strength.
- Semi-densified Advantage: balances low dust property and good dispersity, convenient for transportation, storage and on-site batching.
- Factory Direct: full-item inspection before delivery, with formal COA quality report provided per batch.
Target Applications
- High-strength concrete and precast concrete components
- Special mortar and cement-based functional filling materials
- Civil engineering, hydraulic engineering and transportation infrastructure
- High-performance cement-based composite materials
Quality Assurance
- Certified Quality: ISO9001 quality management system, complying with GB/T 27690-2023 standard.
- Full-item inspection before delivery; official COA inspection certificate provided for each batch.
FAQ
Q: Do you provide samples before bulk order? A: Yes. Free samples are available; buyers bear the freight cost.
