Benefits of AAC Block Adhesive in Construction

In the world of construction, innovation is the key to progress. And when it comes to building with AAC (Autoclaved Aerated Concrete) blocks, there’s a game-changer on the scene – AAC block adhesive. This polymer-based jointing material is revolutionizing the way we bond AAC blocks, fly ash bricks, and concrete blocks. In this informative blog post, we’ll delve into the jointing procedure, functions, technical specifications, and advantages of AAC block adhesive.

Jointing Procedure

1. Surface Preparation

Before applying AAC block adhesive, proper surface preparation is crucial:

  • Clean the surface of loose particles, dust, dirt, oil, and grease.
  • Ensure the base is cured.
  • Repair any surface defects like cracks, holes, or voids.

2. Mixing of Adhesive

Mixing the adhesive is a critical step:

  • Thoroughly mix adhesive with water (approximately 25-30% of the adhesive weight).
  • Use clean potable water.
  • Consider a mechanical stirrer for uniform mixing.
  • Adjust the mix thickness and consistency based on your needs.

3. Application of Adhesive

Application is where the magic happens:

  • Apply a thin layer of mixed adhesive (3-5mm) using a trowel.
  • For blockwork, apply adhesive on both sides of each block.
  • Clean excess adhesive immediately.

Features of AAC Block Adhesive

AAC block adhesive offers some impressive features:

  • High adhesive strength with a thin jointing layer.
  • Pre-mixed for easy use.
  • Cost-effective due to its thin application.
  • No curing required.
  • Rapid tensile strength development.
  • Eliminates shrinkage cracks.
  • Environmentally friendly with low VOC content.

Technical Specifications

Here are the technical specifications you need to know:

  • Bulk Density: 1550-1650 kg/cum
  • Water Powder Ratio: 25% by weight
  • Pot Life: 1 hour @ 27°C
  • Usable Time Post Application: 24 hours
  • Tensile Adhesion (N):
  • Dry Condition: 750N
  • Wet Condition: 450N
  • Shear Adhesion (kN):
  • Dry Condition @ 24hrs: 2.5 kN
  • Dry Condition @ 14 days: 8 kN
  • Wet Condition: 4 kN
  • Splitting Tensile Strength @ 28 days: 0.50 N/sq mm
  • Compressive Strength @ 28 days: 6-7 N/sq mm

Advantages of AAC Block Adhesive

Now, let’s explore the compelling advantages of using AAC block adhesive in construction:

1. Thin Joints and Less Material

AAC block adhesive requires only a 3-4 mm thickness to join blocks, significantly less than traditional cement sand mortar (8-12 mm). This reduces jointing material usage by up to 75%.

2. Speedy Construction

AAC block adhesive is ready-mix, saving time compared to labor-intensive mortar mixing. Just add water for application.

3. No Curing

AAC block adhesive gains strength with the water used in mixing, eliminating the need for additional curing time.

4. Site Cleanliness

Efficient mixing and application ensure a clean construction site environment.

5. Minimum Process Time

Without curing, the masonry is ready for further work, like plastering, in just 24 hours, as opposed to 7 days with cement sand mortar.

6. Less Wastage

AAC block adhesive minimizes waste compared to cement mortar, which can have 20-30% wastage.

7. Thermal Insulation

AAC block adhesive is designed to match the thermal insulation properties of AAC blocks, providing enhanced energy efficiency.

In conclusion, AAC block adhesive is a game-changer in the construction industry. Its ease of use, cost-effectiveness, and environmental benefits make it a superior choice for joining AAC blocks and other construction materials. Embrace innovation and improve your construction projects with AAC block adhesive.

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