Aluminum Paste for AAC

Catégorie Pâte d'aluminium Five Star

Aluminum Paste for Aerated Concrete: High-Performance and Eco-Friendly Solution

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.

Informations complémentaires

Aluminum Paste for AAC: Properties, Production, and Applications

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.

Overview of Aluminum Paste for AAC

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.

Mechanism of Aluminum Paste for AAC

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.

Key Functions and Principles of Aluminum Paste

Gas Generation Reaction

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↑2Al+3Ca(OH)2+6H2O→3CaO⋅Al2O3⋅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.

Pore Structure Optimization

The porous structure formed by aluminum paste enhances material performance:

Thermal insulation: Pores block heat transfer, reducing energy consumption.
Soundproofing: A 10mm thick wall achieves 41 decibels of sound insulation.
Seismic and waterproofing: The porous structure absorbs impact and maintains low water absorption.

Classification and Technical Specifications

Types of Aluminum Paste

Oil-based (GLY series): Solid content ≥75% (GLY-75) or ≥65% (GLY-65), active aluminum ≥90%.
Water-based (GLS series): Solid content ≥70% (GLS-70) or ≥65% (GLS-65), active aluminum ≥85%.

Key Performance Requirements

Gas generation rate: ≥50% in 4 minutes (oil-based) or ≥40% (water-based), ≥99% in 30 minutes.
Fineness: ≤3% residue on a 0.075mm sieve.
Dispersibility: No agglomerates to ensure uniform gas generation.

Production Process of Aluminum Paste for AAC

Préparation des matières premières

Remove oxides from aluminum foil or ingots to ensure uniform thickness.

Ball Milling

Grind aluminum with water additives (e.g., inhibitors, coating agents) to prevent oxidation and enhance dispersibility.

Dehydration and Packaging

Use specialized dehydration presses with high efficiency (5 tons/hour) and low energy consumption (3kW motor).

Market Trends and Future Directions

Industry Status

China produces over 4,000 tons of aluminum paste annually, with major manufacturers like Jinan Hengxing and Yuncheng Hongtai meeting JC/T407 standards.

Future Innovations

Eco-friendly processes: Promote water-based aluminum paste to reduce pollution from dry methods.
Material advancements: Develop high-activity aluminum powder and intelligent production technologies to lower costs.

Application Guidelines

Dosage control: Excessive aluminum paste leads to oversized pores, reducing strength.
Water adaptability: Modern water-based aluminum paste supports tap or well water, simplifying post-processing.

Optimizing Pore Structure with Aluminum Paste

Matching Gas Generation Rate with Slurry Thickening

Adjust the dosage of aluminum paste, additives, and slurry temperature (45-65°C) to regulate reaction kinetics.
Use calcium silicate hydrate seeds to refine pore structure and increase strength by 38.3%.

Enhancing Physical Properties of Aluminum Paste

Grind aluminum paste to ≤3% residue on a 0.075mm sieve for uniform dispersion.
Use high-purity aluminum foil (active aluminum ≥90%) to minimize impurities and improve pore integrity.

Composite Gas Generation and Process Innovation

Combine aluminum paste with foam stabilizers (e.g., soluble oil, saponin) to reduce gas-liquid surface tension and enhance bubble stability.
Adopt water-based aluminum paste to avoid oil contamination and simplify water treatment.

Quantitative Control of Pore Structure

Adjust aluminum paste dosage (0.05%-0.08%) to optimize porosity for lightweight (500-700 kg/m³) and strength (≥3.5 MPa).
Control CaO/SiO₂ ratio (0.6-0.7) during autoclave curing promotes tobermorite formation and reduces gel pores.

Case Studies and Technical Indicators

Typical parameters: Oil-based aluminum paste (GLY-75) generates≥50% gas in 4 minutes and ≥99% in 30 minutes; water-based aluminum paste (GLS-70) has active aluminum ≥85%.
Performance results: Aerated concrete using optimized aluminum paste achieves 41dB sound insulation, 3.5-hour fire resistance for 100mm panels, and ≤10% water absorption.

Aluminum paste enables the synergistic enhancement of lightweight, high-strength, and energy-efficient properties by systematically optimizing the uniformity, pore size distribution, and pore wall strength of aerated concrete. Specific process parameters should be dynamically adjusted based on raw material characteristics and production line conditions.

Spécification de Aluminum Paste for AAC

Estimated Cost of Aluminum Paste for AAC

Nous vous suggérons de communiquer avec nous avant d'acheter, nous prendrons en compte tous les aspects et nous vous proposerons un plan de prix juste et raisonnable. En nous choisissant, vous obtiendrez le meilleur produit et le meilleur rapport qualité-prix.

Choisir la bonne spécification

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.

Quantité d'achat

Plus la quantité achetée est importante, plus le prix unitaire sera bas. Les commandes en gros nous permettent de mieux répartir nos coûts de production et d'exploitation, c'est pourquoi nous sommes heureux de proposer des prix réduits pour les achats en gros.

Conditions de paiement

Le moment et le mode de paiement que vous choisissez ont également une incidence sur le prix. Par exemple, un paiement anticipé intégral peut donner lieu à un prix plus favorable, car il réduit le coût du capital. Veuillez discuter de l'option de paiement la plus appropriée avec notre équipe de vente.

Transport

Le transport et la logistique sont également des facteurs qui influencent le coût total de possession. Selon les modes de transport et les destinations, les frais d'expédition varient. Les droits de douane, l'assurance et d'autres coûts doivent également être pris en compte. En calculant ces facteurs avant l'achat, vous pouvez estimer le coût total avec plus de précision.

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