In the previous blog, we have discussed the AAC blocks that have become an ideal pick for home construction. However, jointing of these blocks requires a special glue. This is because AAC blocks differ from the regular clay bricks in its structure and properties. Read on to know all about this special adhesive.
An overview of block glue
Widely known as AAC Block Adhesive, this glue is made of Portland cement, graded aggregates, and specialized polymers. Block adhesive has more advantages over regular cement mortar. While clay bricks require almost 8-12 mm thickness of cement mortar, AAC blocks require only 3-4mm of its jointing material.
AAC block glue helps in hassle-free jointing of blocks. Since it comes in a pre-mixed form, it only requires water for its application whereas, in the conventional cement mortar, it is required to carefully measure the proportion of the raw materials and then mix it to form a paste. The elements of this adhesive are formulated in such a way that it requires no additional water for curing. This helps in saving water, accounting negligible wastage while cement mortar accounts almost 20-30% of wastage. The self-curing property of block glue helps in a faster construction. While you have to wait for 7 days for the cement mortar to dry, block adhesive dries in a matter of just 24 hrs.
Block glue is available as dry material throughout the year, unlike cement mortar. One of the most important properties of this block adhesive is that the elements are composed in a way that it matches the thermal insulating property of the AAC block. This helps the whole masonry unit to act as a thermal insulator. As far as the quality is concerned, block glue takes the credit. Since the manufacturing of this glue is done in a factory under controlled conditions, the quality of the product is thoroughly checked.
Method of application:
Surface preparation: Before the application of the glue, it is important to prepare the surface of AAC blocks. Ensure that the blocks are completely dust-free. Remove any oil, dust, or bond inhibiting agents from the surface. Once the surface is prepared, wet the AAC blocks to avoid any sudden absorption of water. Make sure there are no loose particles on the masonry units.
Mixing: It is necessary to mix the blockglue mortar thoroughly with water before its application. Use a mechanical stirrer for 3-4 minutes to ensure consistency of the paste. Keep a ratio of 30% water and 70% of the blockglue mix and stir it till there are no air lumps in the paste. Ensure that the paste is thick and not in slurry form.
Application: Once it is mixed, apply a thin layer of this blockglue paste using a proper notch trowel to maintain the thickness of 3mm. Gently press the handle of notch trowel to set each masonry unit(AAC Block) at a proper level. Once the first unit is placed, apply the blockglue paste of the same thickness on all the sides of the unit before placing the second unit. Clean off any extra material and continue this process for the entire work.
Kabco Ventures offer its product known as Kabco BlockFix Adhesive, that has a high-quality blend of Portland cement and specialized polymers that offer superior strength, high retention, and high stability.