Products
Fly Ash
Fly Ash (also called pulverized fuel ash) is a fine, powdery byproduct generated from burning pulverized coal in power plants. Composed primarily of silica (SiO₂: 40–60%), alumina (Al₂O₃: 20–30%), and iron oxide (Fe₂O₃: 5–15%), it exhibits pozzolanic activity-reacting with calcium hydroxide in cement to form strength-enhancing compounds. Unlike traditional aggregates, Fly Ash offers dual value: it reduces industrial waste (diverting 100+ million tons from landfills annually) and improves material performance (e.g., concrete durability, cement cost reduction).
Fly Ash is captured from power plant flue gases via electrostatic precipitators or baghouse filters, resulting in a fine powder (average particle size: 1–100μm) with unique properties:
Pozzolanic Activity: Reacts with cement's calcium hydroxide (Ca(OH)₂) to form calcium silicate hydrate (CSH)-the same strength-giving compound in cement-enhancing long-term concrete strength.
Micro-Filling Effect: Ultra-fine particles fill voids between cement grains, reducing concrete porosity and improving impermeability.
Cost Efficiency: Replaces 15–30% of cement in concrete mixes, cutting raw material costs by 10–20% while reducing carbon emissions (cement production accounts for 7% of global CO₂).
These traits make Fly Ash a cornerstone of "green construction," aligning with LEED, BREEAM, and other sustainable building standards.
chemical composition
| Parameter | Class F Fly Ash | Class C Fly Ash | Metallurgical/Construction Significance |
|---|---|---|---|
| Chemical Composition | SiO₂: 45–60%, Al₂O₃: 25–35%, Fe₂O₃: 5–10%, CaO: ≤8% | SiO₂: 35–50%, Al₂O₃: 15–25%, Fe₂O₃: 10–15%, CaO: 18–25% | SiO₂+Al₂O₃+Fe₂O₃ ≥70% (Class F) ensures pozzolanic activity; CaO ≥15% (Class C) accelerates early strength. |
| Physical Properties | Average Particle Size: 10–20μm, Specific Surface Area (SSA): 350–450 m²/kg | 20–30μm, SSA: 300–400 m²/kg | Finer particles (Class F) improve concrete workability; coarser particles (Class C) reduce water demand. |
| Loss on Ignition (LOI) | ≤6% (ASTM C618) | ≤6% (ASTM C618) | LOI ≤6% indicates low unburned carbon-high carbon (LOI >8%) reduces concrete air entrainment and strength. |
| Moisture Content | ≤1.0% | ≤1.0% | Low moisture prevents clumping and ensures uniform mixing in concrete. |
| Pozzolanic Activity Index | ≥75% (28 days, vs. cement) | ≥75% (28 days) | Higher index means stronger CSH formation-Class F often reaches 85–95% at 90 days. |
| Heavy Metal Content | Pb≤0.005%, Cd≤0.0005% | Same as left | Meets EPA (US) and GB 5085.3 (China) standards for safe use in construction and soil remediation. |
Products Main applications
Building materials:
Concrete: Fly ash, as an admixture for concrete, can improve the fluidity and workability of concrete and increase the strength and durability of concrete.
Cement: used to produce cement mixed with fly ash to improve the performance of cement.
Soil improvement:
Stabilizer: used to improve soil properties and increase soil bearing capacity and compressive strength.
Environmental protection:
Waste treatment: Fly ash can be used for landfill and waste solidification, reducing environmental pollution.
Products Advantages
1. Improve material performance:
Enhance the strength of concrete: Fly ash can improve the compressive strength and flexural strength of concrete.
Improve durability: Reduce the permeability of concrete and extend its service life.
2. Environmental benefits:
Reduce resource consumption: Use fly ash to reduce the demand for cement and other building materials and reduce resource consumption.
Reduce waste: Reusing fly ash helps reduce solid waste after coal combustion.
3. Economic benefits:
Reduce costs: The price of fly ash is relatively low, which helps reduce the overall cost of building materials.
The effective use of fly ash not only improves the performance of building materials, but also promotes the recycling of resources, which is of great significance to environmental protection and economic development.
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