Lightweight concrete has excellent fire-resisting properties. The substance is often made using small Styrofoam balls as a lightweight aggregate instead of the crushed stone that is used in regular concrete. Although the exact mixture used in a lightweight concrete will affect its total weight, an average square foot of lightweight concrete weighs about 14.5 pounds, whereas traditional concrete weighs 18 pounds. thick. Aerated concrete made from a binder, water, fine and coarse aggregate, and a blowing agent which decreased the density of concrete. The lightweight concrete can use for making a structure such as Precast wall blocks and panels, homes on weak foundations, roof and building aprons, partitions, boats, shipbuilding, lightweight blocks/bricks, thin shell roof structures, roof section in high-rise structures, doors, bridge decks, and girders, etc. The structural lightweight concrete can use for the construction of residential and non-residential buildings in seismic areas. Cellular Lightweight Concrete has been long used for slabs and road construction, but getting the industry to look at it as a building block for structural walls has been a challenge. Or is it due to the high water absorption and drying shrinkages of the blocks. Low Sand concrete, in which the voids between the coarse aggregate only partially filled with the paste. Surface rendered for external walls of small houses. However, thermal insulation values for structural LWC are substantially better than NWC. Many types of pre-mixed concrete are available which include powdered cement mixed with an aggregate, needing only water. Any Help? Lightweight aggregates require wetting prior to use to achieve a high degree of saturation. Construction, Work, and Hydropower Dam list, Arch dam| Types of Arch dam, Advantages, and Disadvantages, Culverts:- Types of culverts, compound, Uses, advantages, and disadvantages, 17 Types of Door in building and office and Room, What is Techeomotry? Structural lightweight concrete is a concrete aggregate obtained replacing in whole or in part the ordinary aggregate with an artificial lightweight aggregate formed by expanded clay. Since the unit weight of structural LWC are considerably greater than those of low density concrete, insulation efficiency is lower. It is also used in the construction of stairs, windows, garden walls, etc. Reduction of dead load, faster building rates and lower haulage and handling costs. Save my name, email, and website in this browser for the next time I comment. http://www.homebuildingandrepairs.com/design/index.html Click on this link to learn more about your home design, remodeling and building repairs. Other products such as air-cooled blast furnace slag are also used. In time, the use of lightweight concrete has spread across the U.S., the UK, Sweden and a … The primary driver of Lightweight Foamed Concrete use instead of standard CLSM is load reduction. Better quality control exercised in the construction of a structure with lightweight concrete products owing to the use of factory-made units. Reduced dead load of wet concrete allows longer span to be poured un-propped. It can also help in covering architectural … Screeds and walls where timber has to be attached by nailing. The lightest grades of LWC are relatively soft so that they subject to some abrasion were they not for other reasons protected by rendering. When a 200 mm thick wall of aerated concrete of density 800 kg/ m3 has the same degree of insulation as a 400 mm thick wall of density 1600 kg/ m3. The density of concrete varies from 300 to 1200 kg/m³. Compressive strength are low, regarding from about 0.69 to 6.89 N/mm2. In this case on fine aggregate use. For cost in-situ structures, its sample dead weight makes foundations less expensive. The lightweight aggregate that can be used varies from natural pumice aggregate to man-made sintered aggregate such as sintered fly ash (Mindess et al., 2003). The lightest grade suited for insulation proposed while the heavier grades with adequate strength suited for structural applications. Non autoclaved lightweight aerated concrete is a type of lightweight concrete which is used to produce blocks and replace bricks. The low density of cellular concrete makes it suitable for precast floor and roofing units which are easy to handle and transport from the factory to the sites. Lightweight concrete, also known as EPScrete (expanded polystyrene concrete), is a material widely used in the building of environmentally "green" homes. It is called as no concrete. Construction of partition walls and panel walls in frame structures. Particularly where the need to reduce weight in a structure was an important consideration for design or for the economy. The use of lightweight concrete has been widely spread across countries such as USA, United Kingdom and Sweden. Lightweight concrete mixture is made with a lightweight coarse aggregate and sometimes a portion or entire fine aggregates may be lightweight instead of normal aggregates. Casting structural steel to protect its against fire and corrosion or as a covering for architectural purposes. The structural lightweight concrete can use for the construction of residential and non-residential buildings in seismic areas. Other also advantages of this material are its greater fire resistance, low thermal conductivity, low coefficient of thermal expansion, and lower erection and transports costs for pre-fabricated members. Heat insulation on roofs. Insulation of water pipes. Its low thermal conductivity makes it suitable for protecting another structured form the effects of fir. Lightweight concrete has been used extensively for offshore oil platforms that are built at an onshore graving dock or in a fjord where deep water is close to shore. lightweight substrates / subfloors For thicknesses of more than 10-12 cm, the screed solution should include a lightweight substrate /subfloor layer. In frame structures, considerable savings in cost can be brought about by using LWC for the construction floors, partition and external cladding. Ordinary lightweight concrete prepared from a binder, water fine and coarse aggregate with full filling voids between the large particles. It is used for the protection of fire and corrosion. Uses Of Lightweight Aggregate Concrete. Lightweight concretes strengths are generally in the range of 0.3 N/mm2 (44 psi) to 40 N/mm2 (5800 psi) and cement content in the range of 13 lb/ft3 (200 kg/m3). These two reasons are why it is used for lightweight concrete floors, lightweight concrete roofing and lightweight concrete block. Uses of Lightweight Concrete. Lightweight aggregate concrete is called an LWA. tilt-up walls, topping slabs and composite slabs on top of metal … Autoclaved aerated concrete (AAC) is a lightweight, precast, foam concrete building material suitable for producing concrete masonry unit (CMU) like blocks. All Rights Reserved. What is Lightweight Concrete? These vary from lightweight aggregate concrete, foamed concrete, or Autoclaved Aerated Concrete (AAC). Mechanical damage can result from abrasion or impact excessive loading of flexural members. AAC structures are so soft that they can be hand-sewn and … The point is illustrated by fact that a 125 mm thick solid wall of aerated concrete will give thermal insulation about four times greater than that of a 230 mm clay brick wall. What is Lightweight Concrete? Concrete is used to construct any structure; the ingredients of the concrete are cement, sand, and aggregates. Stephen J. Hayde, a brick manufacturer and ceramic engineer, invented the rotary kiln process of expanding shale, clay, and slate. Concerning lightweight concrete, in the beginning of the 90’s the unique Portuguese lightweight expanded clay aggregate factory has been acquired by an industrial group, world leader in the production of these aggregates. Most building materials such as clay bricks the haulage load is limited not by volume but by weight. In addition to the reduced dead weight, the lower modulus of elasticity and adequate ductility of lightweight concrete may be advantageous in the seismic design of structures. In a building material as chemical attack, physical stress, and mechanical assault:-. NAAC is lighter then conventional concrete. tilt-up walls, topping slabs and composite slabs on top of metal decks. You have entered an incorrect email address! There exist, therefore, large pores within the body of the concrete which are responsible for its low strength, but their large size means that no capillary movement of water can take place. Casting structural steel to protect its against fire and corrosion or as a covering for architectural purposes. Structural seismic responses are based on mass of the structure or dead weight of the structure; the selection of materials to maintain the dead weight low should be adopted. In this method a porous lightweight aggregate of low Specific Gravity instead of normal aggregate of Specific Gravity 2.6 is used. Both types start with the same base 0.5 water : cement ratio slurry. Light concrete is made of lightweight aggregate, it is also called foam concrete. Aerated, Cellular, Foamed or Gas Concrete . Fixing bricks to receive nails from joinery, principally in domestic or domestic type construction. The aggregates used in AAC are extremely fine, even smaller than a grain of sand. At the moment these aggregates are used mainly in light infilling and precasting of lightweight concrete products (Figure 1). -Types, Uses and Advantages, Types of Lightweight Concrete Based on Density and Strength, Reinforced Concrete Slab Casting- Work Procedure, Types of Structural Design and its Processes, 8 Advanced Non-Destructive Testing Methods You Should Know About. Uses for LWFC. Covering for architectural purposes. Due to its porosity and low alkalinity. Figure 1: EPS Concrete . 1. These are sometimes designed as ‘fill’ concrete. Selection of such aggregates has been investig… When completed, these platforms are towed to a permanent location to be set on the ocean floor. These are also used for the construction of the building blocks. Chemical attack is as aggregate ground-water particularly sulfate, polluted air, and spillage of reactive liquids LWC has no special resistant to these agencies: indeed, it is generally move porous than the ordinary Portland cement. Aerated concrete has the lowest density, thermal conductivity, and strength. Lightweight concrete has low density and is adaptable for construction of buildings in low-seismic zones. Although the strength of no-fines concrete is considerably lower than that of normal-weight concrete, this strength, coupled with the lower dead load of the structure, is sufficient in buildings up to about 20 storeys high and in many other applications. For pre-fabricated structures, a smaller crane is required or the same crane can handle larger units due to a reduction in dead weight. Lightweight aggregates used in structural lightweight concrete are typically expanded shale, clay or slate materials that have been fired in a rotary kiln to develop a porous structure. IS it the poor quality of blocks or improper masonary practices. It is also being used for reinforced concrete. Fire and corrosion protection. 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