Adhesive for aerated concrete blocks

Aerated concrete blocks are becoming more and more common for building because of their portability, insulation, and simplicity of use. These blocks are perfect for building walls that are energy-efficient and offer superior soundproofing and thermal insulation. However, it’s essential to use the proper adhesive for aerated concrete blocks in order to guarantee the building’s structural integrity and longevity.

In order to ensure that the aerated concrete blocks are firmly bonded and avoid gaps and cracks that could jeopardize the structure, the adhesive used is essential. Modern adhesives for aerated concrete, in contrast to conventional cement mortar, are made to offer a solid bond with a low thickness. This reduces thermal bridges and preserves the insulating qualities of the block.

It’s important to take weather resistance, application ease, and drying time into account when selecting an adhesive. Realize that there are adhesives that work better in certain climates or with particular building techniques. Builders can improve the performance of aerated concrete blocks and create a more resilient and energy-efficient structure by choosing the right adhesive.

Where it is used?

A unique dry construction mixture called aerated concrete adhesive is diluted with water according to the manufacturer’s recommended ratios. For both interior and exterior work, it replaces traditional cement mortars.

It’s employed for:

• laying blocks of aerated and foam concrete, expanded clay and cinder blocks, bricks;
• leveling wall surfaces, puttingtying them;
• laying ceramic tiles.

Seasonal varieties

There are currently two kinds of mixtures used in building construction. For aerated concrete blocks, adhesive options include:

• White. Considered a summer type, used in warm weather. It owes its light shade (the same as autoclaved aerated concrete) to white Portland cement, which makes it possible to save on interior decoration.
• Gray. Although this type is called winter, it is universal, suitable for work in any season. Due to the presence of antifreeze additives in the composition, it is recommended for use in cold weather, however, it also has a certain temperature limit.

Choosing the appropriate adhesive is essential when building with aerated concrete blocks to ensure sturdy, long-lasting, and energy-efficient walls. Specialized adhesives for aerated concrete blocks provide better bonding strength and insulation qualities than conventional cement mortar. Because these adhesives are simple to use and only call for a thin layer, building time and expenses are decreased. Their great elasticity and water resistance also aid in preventing cracks and thermal bridging, extending the structure’s lifespan and improving its effectiveness. Anyone hoping to maximize the performance of their aerated concrete block projects must comprehend the advantages and proper application of these adhesives.

Composition and characteristics of the mixture

The following ingredients are present in the adhesive for aerated concrete:

• high-quality cement;
• fractionated (specially sifted) sand;
• polymer additives that improve the adhesive properties of mixtures, their thermal conductivity;
• modifiers, thanks to which the seams do not crack when temperatures rise.

The following qualities are among the benefits of compositions when working with aerated concrete:

• the ability to make thin seams (only two to three millimeters thick), which allows to reduce heat loss through joints, reduce construction costs;
• frost and moisture resistance;
• the ability to carry out work in cold weather (with winter glue);
• hardening without shrinkage.

Method of application

Required tools

To get the solution ready, you’ll need:

• a container in which you will need to mix the dry bulk mixture with water;
• a drill with a special attachment (to obtain the correct consistency of sour cream, use a construction mixer);
• measuring device to maintain the correct proportions.

Use a steel or notched trowel for the glue application and laying, or a trowel-ladle (carriage) for aerated concrete.

Method of preparation

25 kg bags are used to sell dry mixes. In order to prepare the adhesive composition, the following calculation is needed: five to five and a half liters of clean water (i.e., 200–220 milligrams per kilogram) are needed for one factory package. Warm liquid (between 15–18 and 60 °C) is desired.

Following mixing, a lump-free mass should be obtained. After letting it "settle" for five to ten minutes, stir it once more. The glue is prepared in portions because it is only useful for a few hours.

Application method

Aerated concrete adhesive should be applied sparingly to clean blocks (i.e., no oil, dust, or grime stains). When laying, the joints’ thickness shouldn’t be more than 2-4 millimeters. Once it has hardened, the excess is either removed right away or chopped off with a trowel. In approximately ten minutes, the blocks can be moved (allowed with a rubber hammer). Use a light tapping motion to level the surface.

Please take note: Wearing gloves and protective clothes is advised to prevent the prepared solution from getting into your eyes and skin. Wearing gauze bandages or a respirator won’t get in the way.

Works in winter

In cold weather, gray winter composition is used for masonry. But, as we’ve already discussed, there is a limit to it (the temperature that is considered "overboard" is not allowed to drop below -10 °C; manufacturers typically advise against going below 5 °C). It is necessary to keep the temperature of the solution above zero in order to ensure good material adhesion.

Note: According to technology, you are not permitted to adhere frozen blocks covered in snow to one another.

Material consumption

According to experts, the amount of aerated concrete adhesive needed per m3 of masonry depends on the size of the "bricks," the state of the blocks’ surfaces, or how accurately their geometry is formed, and whether or not there are any flaws (cracks, chips, etc.).P.), in addition to the builders’ expertise. Practice demonstrates that 1.5 bags of dry base are typically used per m3.

In order to ascertain the exact amount of dry glue consumed in kilograms per cubic meter of masonry, they provide some handy formulas that take into account the length, height, and seam thickness of the gas blocks.

It’s crucial to take project requirements, block size, and weather into account when selecting an adhesive for aerated concrete blocks. By ensuring the stability and durability of your construction, the proper adhesive lowers the possibility of structural problems over time.

Adhesives come in a variety of forms, each with unique advantages. Cement-based adhesives are widely used because they are reasonably priced and highly durable. However, especially for smaller projects, ready-mix adhesives can be more practical and apply more quickly.

Applying adhesive correctly is essential to getting the best results. This entails making sure the surfaces are level and clean and spreading the adhesive evenly. Employing the appropriate instruments, like a notched trowel, facilitates the effective application of adhesive and guarantees a robust connection between the blocks.

The quality and longevity of your project can be greatly improved by using adhesive in the building process. You can guarantee the durability, energy efficiency, and robustness of your aerated concrete block construction by carefully choosing and applying the appropriate type.

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