Cellular Lightweight Concrete (CLC) also known as Foamed concrete is one of the most significant type of concrete used for construction purposes due to its various advantages and usages over traditionally produced concrete.
Foamed concrete is manufactured by mixing Portland cement, sand, fly ash, water and preformed foam in varied proportions. Cellular lightweight concrete can be produced at building sites using machines and molds devised for normal concrete at ambivalent conditions.
- Constituents of Cellular Lightweight Concrete
- Production of Cellular Lightweight Concrete
- Density of Cellular Lightweight Concrete
- Advantages of Cellular Lightweight concrete
- Applications of Cellular Lightweight Concrete
- Difference between Light weight concrete and Aerated Concrete:
Constituents of Cellular Lightweight ConcreteImportant constituents of cellular lightweight concrete are:
- Fly ash, and
Production of Cellular Lightweight Concrete1. Batches of cellular lightweight concrete is manufactured by combining key elements in an ordinary concrete mixer. The strength and dry density of the ingredients differ based on its composition and air pocket content. 2. Continuous Cellular Lightweight Concrete is produced by mixing light mortar and preformed foam under pressure in a special static mixer.
Density of Cellular Lightweight ConcreteThe variable density is described in terms of kg per m³. The density of regular concrete is normally measured at 2400 kg/m³ whereas the density of the foamed concrete ranges from 400 kg/m3 to 1,800 kg/m3 The density of cellular lightweight concrete can be effectively determined by introducing foam formed utilizing a foam-generator. Using fly-ash based CLC lowers the density but it has absolutely no effect on the overall strength of the structures. Large volume is notably realized even with low quantity of concrete.
Density Ranges and their SignificanceFoamed concrete is produced in varied ranges for different purposes: 1. The lower densities (400 –600 kg/m3): CLC at this range of density are ideal for thermal and sound insulations. They act as resistance against fire accidents, termite and moisture absorbent. They have also proved to be better substitute than glass wool, wood wool and thermocol. 2. The medium densities (800-1000 kg/m3): This density of foamed concrete in attained for manufacturing pre- cast blocks for non-load-bearing brickwork. The size of blocks may vary based on the design and construction requirements. 3. The high densities (1200kg/m3 to 1800 kg/m3). This is structural- grade material used for:
- Construction of load-bearing walls and ceilings of low rise structures.
- Formation of partitioning walls
- Production of pre-cast blocks for load -bearing brickwork.
Advantages of Cellular Lightweight concreteCellular lightweight concrete has several advantages associated with their applications:
- Fire resistant
- Thermal insulation
- Sound absorption and Acoustical Insulation
- Environmental Friendly
- Termite proof and resistant towards freezing issues.
Applications of Cellular Lightweight Concrete
- Cellular lightweight concrete is utilized as thermal insulation in the form of bricks and blocks over flat roofs or non-loading walls.
- Bulk filling by applying relatively low strength material for old sewer pipes, wells, unused cellars and basements, storage tanks, tunnels and subways.
- Production of heat-insulated light wall panel.
- Maintain Acoustical balance of concrete.
- Manufacture cement and plaster-based light plate.
- Production of special of light heat resistant ceramic tiles.
- For soil water drainage purposes.
- Application in the bridge to prevent freezing.
- Utilized for tunnel and shaft filling and lightweight concrete manufacturing.
- Production of Perlite plaster and Perlite lightweight concrete.