If you want to choose between the adhesive & cement mortar for AAC block wall masonry, definitely, adhesive joint ranks on top due to its added advantages.
Let's observe the pros & cons between these two types of joints for AAC block wall masonry.
1. Cost:
I have calculated the construction cost of AAC block masonry using Adhesive & cement mortars separately in the below-given article.👇
💗 What will be the cost of AAC block wall masonry?/ Rate analysis of 200mm. thick AAC block wall work.
Although the above article's theoretical calculation shows neck to neck difference in their construction costs, adhesive bond works out to be cheaper. You will understand this when you go through the following 9 points.
2. Wastage:
When we work practically on the construction site, the wastage will be nearer to 10% in the case of cement mortars.
The adhesive layer thickness is kept within 3 to 4mm. That creates a wastage below 5%, i.e. nearly half that of the cement mortar.
3. Quality control:
AAC blocks adhesive comes in a premixed readymade form. You have to add the pre-defined water or as mentioned over the adhesive bags to prepare a mix.
In the case of cement mortar, the mixing of cement, sand, & water is done by the laborers. Keeping an eye on every batch of mix is difficult, & that may create improper mix proportion.
So, adhesives help to maintain the required quality in a better way.
4. Time:
When we compare cement mortar Vs. adhesive, the time required in adhesive joint wall construction is less.
Cement mortar needs mixing of raw materials on-site with lead & lift. But in the case of adhesives, add water & you are ready to start work.
5. Material consumption:
The thickness of the cement mortar layer 👉 10 to 12mm.
The thickness of an adhesive layer 👉 3 to 4mm.
So, the material consumption in the cement mortar layer is 2.5 to 3 times more in comparison to adhesives. That means more labor, more time & higher cost.
6. Cleanliness:
The AAC block wall construction looks neat & clean when we use adhesive bonds. In situ mixes of cement mortar nearer to the working area creates an unclean floor space.
When we work with the cement mortars, the fall off of the fresh mortars from the joints is more. The same is minimal in the adhesive layers.
7. Curing:
AAC block adhesives are formulated by using self-curing compounds in their composition. They don't require any curing after the completion of wall masonry.
But the cement mortar needs proper curing till its specified time period.
8. Project speed :
When we complete the masonry construction with cement mortar, the successive work cannot be started immediately. We have to wait for the curing period to gain the required strength.
When we use adhesives, the plastering work can be done over the next day.
Using adhesive comparatively consumes less time in wall building & completing the work.
So, the project work can be completed in the stipulated time by reducing the time gap.
9. Bond strength:
Adhesives are formulated in such a way that the AAC block properties match well with them. This creates a good bond strength between the two materials, enhancing the life span of the building.
The cement mortars (comparatively ) are not a well-proportioned binder material for the AAC blocks. The composition of AAC blocks makes them brittle in nature. Due to this, the cement mortar fails to hold them together in all types of climatic conditions.
10. Thermal expansion:
The AAC blocks expand & contract due to the external weather conditions.
You may observe cracks in the cement mortar joints due to these thermal expansions of the walls. And again, the reason is the unmatched properties of these two separate materials.
When we use adhesives, rarely you may observe cracks in the walls.
Now, after writing these 10 points, my question to you is,
Which is better for AAC block masonry?
Certainly 👉 Adhesives, right!
To go through the comparison & difference between the several types of building materials & construction costs, click here.
Thank you for going through this article❤. Have a good day😄.
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