Aerated Concrete Block Manufacturing Process: Complete Step-by-Step Professional Guide
Autoclaved Aerated Concrete (AAC) blocks are high-performance lightweight building materials widely used in modern construction. The aerated concrete block manufacturing process is a fully automatic, eco-friendly, and standardized production flow that turns cement, lime, sand, gypsum, and aluminum powder into high-strength, heat-insulated, and fire-resistant AAC blocks. This guide explains the complete production process, core equipment, quality control, and industry advantages to help investors and engineers fully understand AAC block production.
What Is AAC Block Manufacturing Process?
The aerated concrete block manufacturing process is a scientific production technology that uses chemical foaming and high-pressure steam curing to form uniform air pores inside concrete. The finished AAC blocks are lightweight, thermal-insulated, soundproof, fireproof, and easy to construct. The whole production line is highly automated with low energy consumption and stable output, making it the most popular lightweight wall material production solution worldwide.
Core Raw Materials for AAC Block Production
• Silica sand / fly ash (main silicon source)
• Cement (binding material)
• Quick lime (provides calcium and heat)
• Gypsum (adjusts setting time)
• Aluminum powder paste (foaming agent)
• Water (mixing medium)
Full Aerated Concrete Block Manufacturing Process (Step by Step)
Step 1: Raw Material Handling & Grinding
Silica sand or fly ash is sent to the ball mill for fine grinding. The particle fineness reaches 200 mesh, ensuring better foaming and strength. Our professional grinding equipment ensures stable and uniform raw material fineness for high-quality AAC blocks.
Step 2: Batching & Mixing
All raw materials are accurately weighed by the automatic batching system. Then they are fully mixed into a uniform slurry in a high-speed mixer. Precise batching is the key to stable AAC block quality.
Step 3: Adding Aluminum Powder & Foaming
Aluminum powder paste is added into the slurry, which reacts with lime to produce hydrogen bubbles. These bubbles form uniform porous structures inside the concrete, making AAC blocks lightweight and thermal-insulated.
Step 4: Pouring into Molds
The foaming slurry is poured into special steel molds. The slurry expands automatically and fills the whole mold. The mold system is durable and easy to demold, suitable for long-term mass production.
Step 5: Pre-Curing & Hardening
The mold enters the precuring room at 40-50°C. The slurry gradually hardens into a solid AAC cake. After 2-3 hours, the semi-finished block has enough strength for cutting.
Step 6: Demolding & Turning Over
The mold is removed by the automatic demolding system. The AAC cake is turned over and placed on the cutting machine platform, ready for precise cutting.
Step 7: Vertical & Horizontal Cutting
The AAC cake is cut into standard blocks and special sizes by the automatic cutting machine. Our cutting system ensures high precision, smooth surface, and customizable sizes (100mm, 150mm, 200mm, 300mm, etc.).
Step 8: Steaming Curing in Autoclave
Cut blocks are sent into the autoclave for high-pressure and high-temperature steam curing (12.5 atm, 190°C, 8-10 hours). This process greatly improves block strength, density, and durability.
Step 9: Cooling & Packaging
After curing, blocks are cooled and inspected. Qualified products are automatically packaged and ready for delivery. The whole process is clean, efficient, and meets international environmental standards.
Core Equipment in AAC Block Production Line
| Equipment Name |
Function |
| Ball Mill |
Grind raw materials to required fineness |
| Automatic Batching System |
Accurately weigh all raw materials |
| High-Speed Mixer |
Mix slurry uniformly |
| Mold & Carrier Vehicle |
Pouring and forming |
| Precuring Room |
Semi-finished product hardening |
| Automatic Cutting Machine |
Cut into standard sizes |
| Autoclave |
High-pressure steam curing |
Key Advantages of Standard AAC Manufacturing Process
• Stable Product Quality: Uniform pore structure, high strength, low breakage rate.
• Eco-Friendly: No waste water, no waste gas, low carbon emission.
• High Efficiency: Short production cycle, large daily output.
• Wide Raw Material Sources: Use fly ash, sand, industrial waste to reduce cost.
• Customizable Sizes: Flexible cutting for different construction needs.
Frequently Asked Questions About AAC Manufacturing
1. How long is the whole AAC production cycle?
About 10-14 hours from raw material to finished blocks.
2. What is the service life of AAC blocks?
More than 50 years, same as concrete buildings.
3. Can I use fly ash as raw material?
Yes, fly ash is the most cost-effective raw material for AAC blocks.
4. Do you provide full turnkey solutions?
Yes, we offer plant design, equipment, installation, training and after-sales service.
5. What is the capacity of your AAC production line?
We provide 50,000 m³ to 600,000 m³ per year automatic AAC block lines.
Conclusion & Investment Value
The aerated concrete block manufacturing process is a mature, reliable, and high-profit building material production technology. With the global promotion of green construction, AAC blocks have huge market demand. Our full-automatic AAC block production line features high efficiency, low energy consumption, stable quality and easy operation, helping investors build profitable and sustainable AAC block factories. If you plan to invest in the AAC block industry, we can provide you with professional technical support and customized solutions.
