Aluminium Paste & Powder for AAC

Aluminium Paste & Powder (APP) is a key aerating agent for producing lightweight aerated concrete. It reacts with alkaline substances to release hydrogen, creating a porous structure that enhances thermal insulation, soundproofing, and construction flexibility. Ideal for reducing building weight and improving earthquake resistance.

Informations complémentaires

Aluminium Paste & Powder for AAC

Aluminium Paste & Powder (APP) is a crucial aerating agent in producing AAC blocks. It reacts with alkaline substances to release hydrogen gas, forming a lightweight, porous structure. Below are the key aspects:

1. Function & Reaction Mechanism

1.1 Aeration Principle

In an alkaline environment (e.g., Ca(OH)₂), Aluminium Paste & Powder reacts with water to produce hydrogen gas:

2Al+3Ca(OH)2+6H2O3CaOAl2O36H2O+3H2

This reaction creates uniformly distributed pores within the slurry, reducing the final product density to 500-700 kg/m³—only one-fifth of conventional concrete.

1.2 Pore Structure Impact

The size and distribution of pores directly determine AAC’s insulation and soundproofing properties. To achieve an ideal pore structure, the aluminum particles must have a suitable fineness (≤3% residue on a 0.075mm sieve) and a high active aluminum content (≥85%).

aac blocks price list 5starmaterials.com
aac blocks 5starmaterials.com
aac blocks disadvantages 5starmaterials.com
aac blocks manufacturing process 5starmaterials.com

2. Production Process & Technical Requirements

2.1 Raw Materials & Preparation Process

  • Material Selection: Aluminium foil scraps require oxide layer removal, while aluminum ingots must maintain uniform granularity.
  • Ball Milling: Wet milling with additives (such as dispersants and corrosion inhibitors) ensures precise temperature control to prevent oxidation.
  • Dehydration & Forming: Special equipment removes excess moisture, creating high dispersibility and stability aluminum paste.

2.2 Technical Specifications (Based on JC/T407-91 Standard)

TypeSolid Content (%)Fineness (0.075mm Residue)Gas Evolution Rate (%)Active Aluminum (%)
Oil-based GLY-75≥75≤3.0≥90≥90
Water-based GLS-65≥65≤3.0≥85≥85

3. Application Advantages & Market Trends

3.1 Comparison Between Aluminum Paste and Traditional Dry Aluminum Powder

CharacteristicAluminum Paste (Water-based)Dry Aluminum Powder
Production ProcessWet grinding, no need for degreasingDry grinding, requires degreasing
SafetyNo dust explosion riskFlammable and explosive, requires nitrogen protection
Ease of UseDirectly added to slurry, good dispersionRequires pre-degreasing treatment
Environmental ImpactLow pollution, easy wastewater treatmentHigh energy consumption, more pollution

3.2 Performance Advantages

  • Lightweight & High Strength: Reduces building weight by over 40%, enhancing earthquake resistance.
  • Thermal Insulation: Thermal conductivity ranges from 0.11 to 0.16 W/m·K, outperforming traditional brick walls.
  • Ease of Construction: The material can be cut and drilled, allowing for flexible applications in complex structures.

3.3 Market Trends

  • Price Fluctuations: Aluminium prices and energy costs influence market pricing, which will average around ¥10,000 per ton in 2024.
  • Regional Supply & Demand: Major production areas include Anhui, Shandong, and Jiangsu, while demand in the southwest region is growing significantly.
aac masonry block 5starmaterials.com
aac blocks vs hollow blocks 5starmaterials.com
aac blocks price list philippines 5starmaterials.com
aac blocks sizes and prices philippines 5starmaterials.com
aac blocks cost 5starmaterials.com
how to make aac block 5starmaterials.com

4. Quality Control & Testing Methods

Below are key testing methods and technical requirements based on industry standards and practical applications:

4.1 Key Physical Property Tests

4.1.1 Active Aluminium Content Measurement

  • Principle: Hydrogen gas volume from the reaction between Aluminium Paste & Powder and an alkaline solution determines the active aluminum content (theoretical aeration capacity: 1.24 L/g).
  • Method: Operators follow JC/T407 standards using a gas evolution apparatus (featuring reaction bottles, gas volume tubes, and thermostatic baths). The hydrogen gas volume is recorded and adjusted based on temperature and pressure to calculate active aluminum content.
  • Standard: Oil-based aluminum paste must have an active aluminum content of ≥90%, while water-based aluminum paste must be ≥85%.

4.1.2 Fineness Testing

  • Sieving Method: Dried aluminum powder is sieved using a 0.075mm copper mesh (wet sieving with a dispersing agent), with a residue requirement of ≤3%.
  • Laser Particle Analysis: Used to verify uniform particle distribution and optimize milling processes.

4.1.3 Solid Content Measurement

  • Procedure: Weigh aluminum paste samples, dry at 105°C until constant weight, and calculate solid content. (Oil-based ≥75%, water-based ≥65%).

4.2 Chemical Performance Tests

4.2.1 Gas Evolution Characteristics

  • Gas Evolution Curve Test: Conducted at 45°C, where Aluminium Paste & Powder reacts with a cement-sodium hydroxide mixture. The gas evolution curve ensures synchrony between aeration and slurry thickening, preventing collapse or trapped gas.
  • Standard: Oil-based aluminum paste should achieve ≥50% gas evolution in 4 minutes, ≥80% in 16 minutes, and ≥90% in 30 minutes.

4.2.2 Hydrogen Evolution Test (for Passivated Aluminium Powder)

  • pH Monitoring Method: Aluminium powder is dispersed in water and heated to 60°C while monitoring pH changes. A drop to 4.19-4.23 within 35 minutes indicates excessive hydrogen evolution (failure), while a stable pH of 6-7 confirms passivation integrity.

4.2.3 Oxidation Degree Testing

  • Oxygen-Nitrogen Analyzer Method: Pre-treated Aluminium Paste & Powder are heated in a dual-layer graphite crucible (4.5kW), measuring released oxygen to evaluate oxide layer thickness and sintering quality.

4.3 Safety & Environmental Standards

4.3.1 Explosion Prevention

  • Dust Concentration Control: Maintain aluminum powder concentration below 10g/m³ to mitigate explosion risks.
  • Electrostatic Protection: Wet-process aluminum paste is preferred over dry powder to reduce dust explosion hazards.

4.3.2 Environmental Compliance

  • Wastewater Treatment: Monitor heavy metal content (e.g., aluminum ions) in wet milling effluents to ensure regulatory compliance.

4.4 Equipment & Standards Reference

  • Key Equipment: Laser particle analyzers, gas evolution measurement devices, oxygen-nitrogen analyzers, thermal gravimetric analyzers, precision pH meters.
    • Applicable Standards: JC/T407-2008: Aluminium paste technical specifications (active aluminum content, fineness, aeration rate).
    • GB/T11968-2023: Testing methods for autoclaved aerated concrete blocks.

4.5 Important Considerations

  • Sample Pre-Treatment: Before testing, remove oil contamination from aluminum powder via ultrasonic cleaning with petroleum ether, followed by drying.
  • Process Adaptation: Adjust the dosage of Aluminium Paste and powder based on slurry temperature and calcium-to-silicon ratio (0.55-0.80) to synchronize aeration with thickening.
cost of aac block 5starmaterials.com
what are aac blocks 5starmaterials.com

5. Impact of Gas Evolution Characteristics on AAC

5.1 Aeration Speed & Production Process Synchronization

5.1.1 Matching Aeration & Thickening

Aluminium Paste & Powder must aerate at a rate that aligns with slurry thickening:

  • Too Fast (e.g., >20ml in 2 minutes): Excessive gas release before slurry setting causes pore merging, collapse, or sedimentation.
  • Too Slow (e.g., <6ml in 2 minutes): Residual aluminum powder continues reacting after the slurry sets, leading to trapped gas, cracks, or uneven expansion.
  • Ideal Range: Data suggests optimal stability at 6-15ml in 2 minutes, 40-60ml in 8 minutes, and 70-90ml in 16 minutes.

5.1.2 Temperature Sensitivity

Maintain slurry temperature at 40-60°C. Excessive heat accelerates aeration, risking uncontrolled expansion, while low temperatures slow aeration, leading to uneven pore distribution.

5.2 Gas Evolution & Pore Structure

  • Pore Uniformity: High active aluminum content (≥85%) and fine particle size (≤3% residue on a 0.075mm sieve) ensure even aeration. Low activity or oversized particles create large, interconnected pores, reducing compressive strength by 15-30%.
    • Density & Functional Properties: Theoretical Gas Evolution: 1g of aluminum produces 1.24L hydrogen. Practical aeration should reach at least 90% of the theoretical value to ensure a 500-700 kg/m³ density.
    • Thermal & Acoustic Performance: When pore size ranges from 0.2-2mm and porosity is 70-85%, thermal conductivity drops to 0.11-0.16W/m·K, outperforming conventional brick walls by 4-5 times.

6. Optimization Strategies for Aeration Performance

6.1 Raw Material Selection

  • Prefer Water-Based Aluminium Paste (GLS-65): It offers better dispersion and minimizes dust explosion risks.
  • Active Aluminium Content Testing: For accurate results, utilize JC/T407 gas evolution measurement devices with temperature compensation.

6.2 Process Adjustments

  • Calcium-Silicon Ratio (0.55-0.80): Excessive alkalinity (high Ca(OH)₂ content) inhibits aluminum reactions.
  • Foam Stabilizers (e.g., Soluble Oil): Extend bubble stability by 30-50%, reducing collapse risks.

Fiver Star New Materials ensures optimal concrete quality, enhancing thermal efficiency, mechanical strength, and construction adaptability by fine-tuning aeration parameters.

what is aac block 5starmaterials.com
aercon aac blocks 5starmaterials.com

Specification of Aluminium Paste & Powder for AAC

Spécification de la pâte d'aluminium en phase aqueuse

Estimated Cost of Aluminium Paste & Powder 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.

Manufacturing Craft of Aluminium Paste & Powder for AAC

At Five Star Materials, our Aluminium Paste & Powder for AAC produced in a delicate and rigorous process. Below is our basic production process:

Préparation des matières premières

Nous achetons des matières premières de grande pureté auprès de fournisseurs de confiance afin de garantir la qualité de nos produits dès la source.

Broyage

La matière première est broyée pour transformer les blocs d'aluminium en minuscules particules en vue d'un traitement ultérieur.

Processus de mélange

La poudre d'aluminium broyée est mélangée à nos solvants et additifs spécialement formulés, puis mélangée à grande vitesse. Cette étape est très importante car elle détermine la stabilité de la pâte d'aluminium et la forme des particules.

Filtration et essais

Après le broyage, la pâte d'aluminium passe par un système de filtration pour éliminer les éventuelles impuretés. Notre équipe de contrôle de la qualité effectue ensuite une série de tests sur le produit, tels que la taille des particules, la brillance, le toucher métallique, etc., afin de confirmer que le produit répond à nos normes de qualité élevées.

Emballage et stockage

Les produits qui ont passé des tests rigoureux sont soigneusement emballés et stockés dans nos entrepôts, prêts à être expédiés à nos clients.

Veuillez noter qu'il s'agit d'un processus de production de base et que le processus exact peut varier en fonction des exigences spécifiques du produit. Chez Five Star Materials, nous prenons le contrôle de la qualité très au sérieux et nous nous assurons que nos produits répondent à nos normes de qualité strictes à chaque étape du processus de production.

aac building blocks 5starmaterials.com
cropped five star materials logos

Vous souhaitez obtenir plus d'informations ?

Chez Five Star Material, nous comprenons que chaque projet est unique et notre objectif est de fournir les meilleures solutions personnalisées à chaque client.

fr_FRFrançais

CONNECTER

Nous vous contacterons dans les 24 heures.

Pour toute demande urgente, veuillez nous contacter par whatsapp : +86-18001668319

tenir bon

Nous disposons d'un catalogue des produits les plus récents et d'un devis spécial. N'hésitez pas à nous contacter.

Pour toute demande urgente, veuillez nous contacter par whatsapp : +86-18001668319

atelier des matériaux cinq étoiles 1.jpg