ACI Ltd. produces non-load bearing types of CLC blocks: These type of blocks are for insulation purposes only.
|Name||Type||Thickness (cm)||Length (cm)||Height (cm)||Density (kg/m3)||Compressive MPa (N/mm2)|
|ACI 400||Non load-bearing||10||54||25||400||1|
|ACI 400||Non load-bearing||15||54||25||400||1|
Thermal Conductivity Coefficient
|K - Thermal Transmission Coefficient|
|10 cm||15 cm||20 cm|
In the market there are two types of lightweight concrete, Cellular Lightweight Concrete (CLC) and Aerated Autoclave Concrete (AAC). Both use air bubbles to lower the block weight while at the same time improving the product.
The difference between AAC and CLC lies in how the air bubbles are generated. AAC bubbles are generated through the use of aluminum powder which generates hydrogen gas bubbles. Such blocks are placed in an autoclave to cure (the autoclave is required because this product has low cement contents). On the other hand, CLC is a process based on making air bubbles in the form of a foam and then mixing the foam into a cement mix. Since CLC have higher cement contents, no autoclave curing is required instead; the finished product is cured like normal concrete.
When compared to AAC lightweight products, CLC air bubbles are significantly smaller, stronger, and each bubble is part of a closed cell system which means ACI block products have lower water absorption - about half of the water absorption as AAC and hollow concrete brick. Compared, CLC increases it strength infinitely under atmospheric conditions and therefore does not have to be protected against humidity.
|Parameters||ACI® CLC||AAC||Concrete Hollow Core Blocks|
|Basic raw material||Cement, sand, water and foam||Cement, lime, specially grinded sand, high primary energy input||Cement, sand and aggregate|
|Dry density kg/m³||400 - 700||425 - 700||1700|
|Usage||Thermal insulation & void filling, Partitions, non-load & load bearing blocks, load bearing||non-load & load bearing blocks||load bearing and non-load bearing walls|
|Ageing||Gains strength with age (like conventional concrete)||No ageing (loses strength, if not protected against humidity)||Yes|
|Thermal conductivity (W/mK)||0.09-0.14 (depending on density)||0.11-0.18 (depending on density)||2.1|
|Sound insulation||Superior than cement block||Superior than cement block||Normal|
|Water Absorption (by weight)||16%||>35%||20%|
|Ease of working||Superior: can be cut, sawn, nailed, drilled, ordinary mortar/plaster||Special mortar (glue) and plaster is required||Normal mortar|
|Eco friendliness||Pollution free||High energy consumption||Pollution free|