cellular lightweight concrete bricks are one of the most popular types of blocks for construction purposes. They are made by blending cement, fly ash, sand, and preformed foam in varied proportions. These materials are easy to handle and can be produced at the construction site using a special machine and molding device.
CLC bricks are lighter than the normal dense weight concrete bricks, but their elastic modulus is lower than the equivalent strength, normal weight concrete. This is mitigated by the reduced self-weight and therefore the effect of deflections on beams and slabs is less.
Low-density Portland cement with various microscopic air bubbles is used to make cellular lightweight concrete bricks. The presence of the air pockets is important to its mechanical properties as it improves the compressive strength and flexural strength of the blocks.
Lightweight concrete is a type of building material that is less dense than regular density concrete and has better properties in terms of strength, elasticity, and thermal conductivity. It is used in a variety of structural applications, including bridges.
A typical cellular lightweight concrete block is manufactured by mixing light mortar and preformed foam under pressure in a special static mixer. The material is then poured into molds and allowed to set for 18 to 24 hours.
A study was done to improve the strength of cellular lightweight concrete bricks by changing the mass ratio of sand and cement in the mixture. The results showed that the compressive strength of the bricks was higher when the sand and cement mass ratio in the mix were increased. The bricks with a mass ratio of sand and cement 1:2 had a 28-day compressive strength of 0.52 MPa, while the bricks with a mass ratio of a sand and cement 2:3 had a 28-day compression strength of 0.68 MPa.