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Aluminum paste for aerated concrete is crafted from high-purity aluminum powder (aluminum content ≥98%) and composite stabilizers. It is available in two types: oil-based (75-grade, 65-grade) and water-based, with a solid content of 75%-85%. Compliant with the JCT407-2008 National Standard for Aluminum Paste in Aerated Concrete, this product excels in performance, stability, and environmental sustainability.
Aluminum paste is critical in producing AAC, directly influencing its pore structure and performance. This study explores the types, properties, preparation processes, and application standards of aluminum paste in aerated concrete production. It also highlights the technological evolution from traditional dry aluminum powder to modern water-based aluminum paste. The findings reveal that water-based aluminum paste significantly improves gas generation efficiency, simplifies production processes, reduces costs, and minimizes environmental pollution.
Aerated concrete is a lightweight, porous building material. During production, aluminum paste reacts with an alkaline environment to release hydrogen gas, creating numerous tiny bubbles that form a porous structure. These pores enhance the material’s thermal insulation, soundproofing, and strength while maintaining lightweight properties.
Aluminum paste is added precisely, typically 7-9 parts per 10,000 raw materials. This small addition generates sufficient gas to expand the concrete slurry, forming the desired pore structure. The quality and activity of the aluminum paste directly affect the expansion, pore distribution, and final performance of the aerated concrete, making it an indispensable component in the production process.
Aluminum paste reacts with alkaline substances (primarily from lime and cement) in the concrete slurry to release hydrogen gas. This reaction requires a specific temperature range, usually 35°C-40°C, to meet process demands. The generated bubbles distribute evenly throughout the slurry, causing it to expand and form a porous structure. During subsequent autoclave curing, these pores solidify, resulting in lightweight yet strong aerated concrete.
Aluminum paste reacts with alkaline substances (e.g., lime) to produce hydrogen gas, forming uniformly distributed closed pores. The reaction equation is: 2𝐴𝑙+3𝐶𝑎(𝑂𝐻)2+6𝐻2𝑂→3𝐶𝑎𝑂⋅𝐴𝑙2𝑂3⋅6𝐻2𝑂+3𝐻2↑2آل+3كاليفورنيا(أوه)2+6H2O→3ثاني أكسيد الكالسيوم⋅آل2O3⋅6H2O+3H2↑ This process reduces the density of aerated concrete to 500-700 kg/m³, just one-fifth that of ordinary concrete, significantly lowering building weight.
The porous structure formed by aluminum paste enhances material performance:
The production process of aerated aluminum paste (slurry)/powder is crucial in determining the final product’s quality and performance. This chapter will detail the production flow, key technologies, and control points of each stage in the manufacturing process of aerated aluminum paste (slurry)/powder to help readers better understand the manufacturing of this critical material.
The production flow of aerated aluminum paste (slurry)/powder typically includes the following main steps:
Before production begins, the selection and Preparation of raw materials are crucial. The main raw materials include aluminum powder, additives (such as DEG, dispersants, etc.), and other ingredients. The selection of aluminum powder is usually based on its particle size, activity, and purity. Highly active aluminum powder can generate more hydrogen gas when reacting with water, thus achieving better gas generation effects. The selection of additives needs to consider their role in the aerated aluminum paste, such as improving fluidity and enhancing reactivity.
The prepared aluminum powder and additives are mixed in a certain proportion. This step usually uses high-efficiency mixing equipment to ensure uniform component distribution and avoid agglomeration. The mixing time and speed must be strictly controlled during the mixing process to ensure a sufficient combination of aluminum powder and additives, laying a good foundation for subsequent reactions.
The mixed materials need to be ground to reach the specified particle size. This step is crucial for improving the activity of the aluminum powder. Using ball mills or other types of grinding equipment can effectively reduce the particle size and increase the surface area of the aluminum powder, thereby enhancing its reactivity with water. After grinding, the materials must also be classified to ensure particle size and product distribution consistency.
In this step, the ground aluminum powder is mixed with water and other necessary additives to form the aluminum paste. The reaction conditions at this time (such as temperature and stirring speed) need to be controlled to ensure that the reaction between aluminum powder and water is sufficient to generate a stable bubble structure. Better gas generation effect and fluidity can be obtained through reasonable proportioning and stirring.
The prepared aerated aluminum paste (slurry) must pay attention to environmental conditions during storage and transportation, avoiding high temperatures and humidity to prevent premature reaction and failure. Its physical and chemical properties should be checked regularly during storage to ensure stable product quality. Finally, the aluminum paste must be packaged according to standards to ensure no leakage or deterioration occurs during transportation.
In the production process of aerated aluminum paste (slurry)/powder, several key technologies have a profound impact on the performance and quality of the final product:
Ball milling is an important technology for grinding aluminum powder. The physical grinding process can effectively reduce the particle size of the aluminum powder and increase its specific surface area. Smaller particle sizes help enhance the reactivity of the aluminum powder, allowing it to generate hydrogen gas more rapidly when reacting with water, thereby forming a uniform and stable bubble structure.
Classification technology plays an important role in ensuring the consistency of the particle size distribution of aluminum powder. Through classification, aluminum powders of different particle sizes can be separated, improving the activity and adaptability of the material. A suitable particle size distribution can optimize bubble formation and enhance aerated concrete’s strength and thermal insulation performance.
In the preparation process of aluminum paste, controlling reaction conditions (such as temperature and time) is crucial. Reasonable reaction conditions can ensure that the reaction between aluminum powder and water is sufficient to generate an adequate number of evenly distributed bubbles. The application of reaction control technology helps to improve the stability and consistency of the product.
Product performance can be improved by continuously optimizing the formulation of aluminum paste (slurry). For example, adding appropriate amounts of certain additives can increase the aluminum powder’s reaction rate and improve the aluminum paste’s fluidity and stability. In addition, for different application needs, enterprises can develop various types of aluminum paste to meet the market’s diverse needs.
In production, controlling environmental conditions (such as temperature and humidity) is also crucial to ensure product quality. Especially in the storage and transportation stages, it is necessary to provide suitable environmental conditions to prevent the aluminum paste from failing or deteriorating due to environmental changes.
Quality control is an important link throughout the production process to ensure the stable performance of aerated aluminum paste (slurry)/powder. Enterprises usually establish a complete quality management system, including:
Before production begins, all raw materials must undergo strict quality inspection to ensure they meet production standards. The aluminum powder’s activity, purity, and particle size distribution need to be tested to determine whether it meets the production requirements.
During the production process, the parameters of each stage (such as temperature, humidity, mixing time, etc.) are monitored in real-time to ensure that the production process is always in the best state. In addition, online testing equipment can detect and adjust problems in time to prevent the generation of unqualified products.
After the product is produced, comprehensive performance testing of the finished product is required, including indicators such as fluidity, gas generation, and compressive strength, to ensure that it meets relevant standards and customer needs. Only products that have passed strict testing can be put on the market for sale.
We suggest you to communicate with us fully before purchasing, we will certainly consider all aspects and provide a fair and reasonable price plan. By choosing us, you will get the best product and the best value for your money.
Choosing the right size of product gives you the best value for money. Our Metal Flash Aluminum Silver Paste is available in a wide range of particle sizes and purities, with prices varying by specification. By communicating your needs in detail and choosing the right size, you can get the best value for your money.
The larger the quantity purchased, the lower the unit price will be. Bulk orders allow us to better share our production and operating costs, so we are happy to offer discounted prices for bulk purchases.
The timing and method of payment you choose will also affect the price. For example, paying in full upfront can result in a more favourable price, as it reduces our cost of capital. Please discuss the most suitable payment option with our sales team.
Transport and logistics are also factors that affect the total cost of ownership. Different modes of transport and destinations will incur different shipping costs. Duties, insurance and other costs also need to be taken into account. By calculating these factors in advance of purchase, you can more accurately estimate the total cost.
At Five Star Material, we understand that every project is unique, and our goal is to provide the best customized solutions for each customer.
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