Micro Silica
Boost Concrete Strength, Durability & Impermeability with Advanced Micro Silica
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Micro Silica, also known as Silica Fume, is one of the most powerful mineral admixtures used in modern concrete technology. At Velosit India, our high-purity micro silica for concrete is engineered to significantly enhance compressive strength, reduce permeability, and improve long-term durability — making it ideal for India’s demanding infrastructure and construction conditions.
From high-rise buildings and industrial floors to marine structures and repair mortars, micro silica powder plays a critical role in producing high-performance concrete that lasts longer and performs better.
What Is Micro Silica (Silica Fume)?
Micro Silica is an ultra-fine, amorphous silicon dioxide powder collected as a by-product during the production of silicon metal and ferrosilicon alloys. With particles nearly 100 times finer than cement, silica fume fills microscopic voids within concrete, creating a denser, stronger, and more impermeable matrix.
When used in concrete, micro silica reacts with calcium hydroxide released during cement hydration, forming additional C-S-H gel the primary strength-giving compound in concrete.
Applications of Micro Silica
Micro silica is widely used across multiple construction applications:
- High-strength & high-performance concrete
- Industrial flooring and pavements
- Marine and coastal structures
- Bridges, flyovers, and tunnels
- Precast concrete elements
- Shotcrete and sprayed concrete
- Repair mortars and overlays
- Water-retaining and waterproof concrete structures
Its versatility makes micro silica for concrete an essential component in modern Indian construction.
Micro Silica vs Other Cementitious Materials
| Material | Strength Gain | Permeability Reduction | Durability |
| Micro Silica | Very High | Excellent | Excellent |
| Fly Ash | Moderate | Moderate | Good |
| GGBFS | High | Good | Very Good |
For projects where maximum strength and impermeability are critical, silica fume clearly outperforms conventional cement replacements.
Technical Specifications of Velosit Micro Silica Powder
Property | Value |
Form | Free-flowing densified powder |
Color | Dark grey |
SiO₂ Content | 90% ± 1-2% |
Dry Bulk Density | 620 kg/m³ ± 20 |
Specific Gravity | 2.3 ± 0.1 |
Specific Surface Area | 22.5 m²/g ± 7.5 |
Moisture Content | <0.35% |
Loss on Ignition | 3.0% ± 1.0 |
Retention on 45μ Sieve | 5 % ± 2.0 |
Fire Rating | Class A1 (EN13501-1) |
Recommended Dosage | 5–12 % by weight of cement |
Packaging | 25 kg bags / bulk on request |
Why Use Micro Silica in Concrete?
Performance Advantages of Micro Silica
✔ Increases compressive strength by up to 20–30%
✔ Reduces water permeability and chloride ingress
✔ Enhances abrasion and chemical resistance
✔ Improves bonding between cement paste and aggregates
✔ Extends service life of concrete structures
By densifying the concrete microstructure, micro silica for waterproofing and durability is especially effective in aggressive environments such as coastal zones, basements, water tanks, and industrial plants across India.
Velosit Micro Silica – Engineered for Indian Construction
Unlike generic supplier-grade materials, Velosit micro silica is carefully processed to ensure consistent quality, optimal particle distribution, and compatibility with advanced admixture systems.
Key Benefits of Velosit Micro Silica
- High SiO₂ content for superior pozzolanic activity
- Optimized for high-strength concrete, SCC, and shotcrete
- Compatible with superplasticizers and waterproofing systems
- Suitable for Indian climatic and site conditions
- Backed by technical expertise and on-site application guidance
This makes Velosit India a trusted micro silica supplier in India for infrastructure, commercial, and industrial projects.
Why Choose Velosit India as Your Micro Silica Supplier?
✔ Proven expertise in construction chemicals & cementitious systems
✔ Reliable micro silica supplier in India
✔ Strong focus on performance, durability & sustainability
✔ Technical backing for complex and large-scale projects
✔ Pan-India supply capability
Our solutions are trusted by contractors, consultants, and infrastructure developers across India.
Frequently Asked Questions (FAQs)
What is the difference between micro silica and silica fume?
There is no difference. Micro silica and silica fume refer to the same material.
Is micro silica good for waterproofing concrete?
Yes. Micro silica for waterproofing significantly reduces concrete permeability and water absorption.
Is micro silica suitable for Indian climate conditions?
Absolutely. It improves durability against heat, humidity, chlorides, and aggressive environments common in India.
Where can I buy micro silica in India?
You can source high-quality micro silica powder in India directly from Velosit India with technical support.
FAQs
Q1: Is Velosit MS 9902 ASTM/IS compliant?
Yes — regularly tested to conform with ASTM C1240:2020,IS 1727-1967 & IS 15388:2003 standards.
Q2: What is the typical dosage for micro silica?
Between 5–12 % by weight of cement, confirmed via trial mixes.
Q3: Can it be used in marine structures?
Yes — it significantly reduces chloride and sulphate ingress.
Q4: What is the advantage of densified micro silica?
Reduces dust, improves handling, and optimizes storage space.
Q5: Does it improve workability?
Yes — it enhances rheology and cohesiveness, reducing bleeding and segregation.
Ready to elevate your concrete performance?
Contact Velosit India today for TDS, MSDS, bulk pricing, and technical support.
📞 +91-86920 66664
📧 info@velositindia.com
🌐 www.velositindia.com