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2. The structural lightweight concrete can use for the construction of residential and non-residential buildings in seismic areas. Aerated concrete is only slightly alkaline. Figure 1: EPS Concrete . Lightweight aggregates require wetting prior to use to achieve a high degree of saturation. This type of concrete is known as, By introducing large voids within the concrete or mortar mass; these voids should be clearly distinguished from the extremely fine voids produced by air entrainment. The substance is often made using small Styrofoam balls as a lightweight aggregate instead of the crushed stone that is used in regular concrete. With low unit weight, seldom exceeding 800 kg/m³, heat insulation value are high. Insulation of water pipes. It is used of screeds and thickening. The lightest grades of LWC are relatively soft so that they subject to some abrasion were they not for other reasons protected by rendering. The structural lightweight concrete can use for the construction of residential and non-residential buildings in seismic areas. For the same crushing strength, the density of concrete made with such an aggregate can be as much as 35% lower than the normal weight concrete. The primary driver of Lightweight Foamed Concrete use instead of standard CLSM is load reduction. The use of these concrete requires a fair degree of compressive strength, and thus they fall about midway between the structural and low density concrete. The benefits of using lightweight aggregate concrete include: Reduction in dead loads making savings in foundations and reinforcement. Screeds and thickening for general purposes especially when such screeds or thickening and weight to floors roofs and other structural members. Ordinary lightweight concrete prepared from a binder, water fine and coarse aggregate with full filling voids between the large particles. Other products such as air-cooled blast furnace slag are also used. It is used for the protection of fire and corrosion. I have come across problems of plaster cracking with walls made up of Autoclaved Aerated Concrete Blocks (AAC BLocks).What are the reasons for it. Drying shrinkage commonly causes cracking of LWC if suitable precautions are not taken. The Latermix Cem range of lconcretes can be used for subfloors that are strong and very lightweight (450 – 600 kg/m 3 ) and contribute significantly to the thermal insulation of the slab. Construction … Also Read: Lightweight Concrete -Types, Classification, Uses and Advantages 7. Uses of Lightweight Concrete. 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. Light concrete is made of lightweight aggregate, it is also called foam concrete. In time, the use of lightweight concrete has spread across the U.S., the UK, Sweden and a … For pre-fabricated structures, a smaller crane is required or the same crane can handle larger units due to a reduction in dead weight. If the aggregates aren't fully saturated they have a tendency to float towards the surface of the mix after it has been placed. It is called as no concrete. 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. Compressive strength are low, regarding from about 0.69 to 6.89 N/mm2. 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. It also called a gap graded concrete and dealt separately. Its low thermal conductivity makes it suitable for protecting another structured form the effects of fir. Physical stresses to which LWC is exposed are principally frost action and shrinkage and temperature stresses. These are employing chiefly for insulation purposes. Aerated concrete made from a binder, water, fine and coarse aggregate, and a blowing agent which decreased the density of concrete. Uses Of Lightweight Aggregate Concrete. The main specialties of lightweight concrete are its low density and thermal conductivity. 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. 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. The insulation value of lightweight concrete is about three to six, times that of bricks and about ten times of concrete. All Rights Reserved. tilt-up walls, topping slabs and composite slabs on top of metal decks. 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). The density of aggregate plays a vital role in the strength of lightweight concrete. Minimum compressive strength is 17.24 N/mm². Reduced dead load of wet concrete allows longer span to be poured un-propped. 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. Like timber, it can be sawn, screwed and nailed, but there are non-combustible. NAAC is lighter then conventional concrete. It is not recommended for use below damp-course. This concrete saves 15 to 20 % in the cost of construction of floors and roots. CLC, and its cousin Aerated Autoclaved Concrete block (AAC), reduce masonry partition wall weight and allow fast construction. The lightest grade suited for insulation proposed while the heavier grades with adequate strength suited for structural applications. It can be used for repairing wooden floors of old buildings, carrying walls of low thermal conduction, bridge decks, floating quay, etc. A less obvious but nonetheless important characteristics of LWC is its relatively low thermal conductivity, a property which improves with decreasing density in recent years, with the increasing cost and scarcity of energy sources, more attention has been given the formerly to the need for reducing fuel consumption while maintaining, and indeed improving, comfort conditions buildings. Lightweight aggregate is relatively new material. Structural lightweight concrete can use in piers and beams, slabs and wall elements in steel and concrete frame buildings, parking structures. The use of LWC has sometimes made its possible to proceed with the design which otherwise would have been abandoned because of excessive weight. However, thermal insulation values for structural LWC are substantially better than NWC. The eight of the building in term of the loads transmitted by the foundations is an important factor in design, particular for the case of tall buildings. Composition, Uses, Properties, Advantages, Quantity of Cement and Sand Calculation in the Mortar, 7 Difference between Plastering and Pointing, What is Plaster? For the first applications, the lightest possible material is used, i.e., usually it has a specific gravity of 0.5, the strength being of less importance. Since this cement consists of lightweight aggregates, it is used in coarse aggregates and sand, clay, foamy slag, clinker, and crushed stone, aggregates of organic and inorganic. http://www.homebuildingandrepairs.com/design/index.html Click on this link to learn more about your home design, remodeling and building repairs. In a building material as chemical attack, physical stress, and mechanical assault:-. These are also used for the construction of the building blocks. Structural Performance of Lightweight Concrete The Pantheon, built 18 centuries ago, demonstrates the structural performance of lightweight concrete to be superior to many contemporary building materials. It is also used in the construction of stairs, windows, garden walls, etc. In frame structures, considerable savings in cost can be brought about by using LWC for the construction floors, partition and external cladding. thick. Sound insulation in cellular concrete is normally not as good as in dense concrete. These are sometimes designed as ‘fill’ concrete. Lightweight concretes (LWCs) can be used in various construction fields. It … A number of ways can be used to produce lightweight concrete mainly using lightweight aggregate or lightweight matrix. The density of concrete varies from 300 to 1200 kg/m³. 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. Both types start with the same base 0.5 water : cement ratio slurry. kg/m³) is infrequently used, most lightweight concrete has an equilibrium density of 105 to 120 lb/ft³ (1680 to 1920 kg/m³). 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 has low density and is adaptable for construction of buildings in low-seismic zones. With suitable design containers much larger volumes of LWC can haul economically. Lightweight aggregate concrete is called an LWA. Lightweight Foamed Concrete Bridge Abutment. Covering for architectural purposes. Its density does not exceed 180 kN/m² because of the use of light and porous aggregate. lightweight substrates / subfloors For thicknesses of more than 10-12 cm, the screed solution should include a lightweight substrate /subfloor layer. Surface rendered for external walls of small houses. 70% of the concrete is composed of aggregates (fine and coarse aggregates). Uses of Lightweight Concrete: There are the following uses as given below; For decks of long-span bridges, it is used. The present study covers the use of pumice lightweight aggregate (PLA) to produce the lightweight concrete (LWC) for use in construction of load-bearing or non-load bearing elements. Light weight concrete finds its use generally in situations like: Decks of long span bridges. 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. IS it the poor quality of blocks or improper masonary practices. Uses for LWFC. What is Lightweight Concrete? Screeds and walls where timber has to be attached by nailing. Screeds and walls where timber has to be attached by nailing. 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. Save my name, email, and website in this browser for the next time I comment. The strength of such concrete is, however, less, but still, it is adequate to be used for precast concrete and reinforced concrete units. This concrete as. When the floor or roofs require thickening or smoothness it can be used to achieve it easily. Stressing may be due to the drying shrinkage of the concrete or to differential thermal movements between dissimilar materials or to other phenomena of a similar nature. 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. Lightweight aggregate concrete can be used for casting structural steel to protect it against fire and corrosion. Coarse particles of the aggregate are coved by a thin layer of cement, paste and the voids between them remain empty. Most building materials such as clay bricks the haulage load is limited not by volume but by weight. Casting structural steel to protect its against fire and corrosion or as a covering for architectural purposes. The use of lightweight concrete has been widely spread across countries such as USA, United Kingdom and Sweden. © 2009-2020 The Constructor. Structural lightweight concrete can use in piers and beams, slabs and wall elements in steel and concrete frame buildings, parking structures. Lightweight concrete is used to minimize overall dead load in structures, and also has a remarkable fire resistance quality more than normal weight aggregate concrete. What is Lightweight Concrete? Its advantages are that there is a reduction of dead load, faster building rates in construction and lower haulage and handling costs. Construction of partition walls and panel walls in frame structures. Due to its porosity and low alkalinity. 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. 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. A chemical aspects of durability is the stability of the material itself, particularly at the presence of moisture. How to Select the Right Curing Method for Structural Concrete ... By using porous lightweight aggregate of low apparent specific gravity, i.e. In this case on fine aggregate use. Aerated Concrete is a variety of extremely lightweight concrete ( density 480-800 Kg/ m 3 ). The aggregates used in AAC are extremely fine, even smaller than a grain of sand. 1. Classification of Lightweight concrete: There are three broad classifications of lightweight concrete based on the method employed for production. Filling for floor and roof slabs. 05 in.) This concrete can also be for the construction of underground bunkers. 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. In large building construction this is … Lightweight concrete, also known as EPScrete (expanded polystyrene concrete), is a material widely used in the building of environmentally "green" homes. tilt-up walls, topping slabs and composite slabs on top of metal … Better quality control exercised in the construction of a structure with lightweight concrete products owing to the use of factory-made units. © Copy right 2017-2020 civilknowledges.com, Lightweight concrete: Types, Properties, and Uses, Advantages, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Pinterest (Opens in new window), Click to share on Telegram (Opens in new window), Click to share on WhatsApp (Opens in new window), Click to share on Reddit (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on Pocket (Opens in new window), Click to share on Skype (Opens in new window), Lightweight concrete: Types, Properties and Uses, What is Clinker Block? Durability is defined ass the ability of a material to withstand the effect of its environment. The light concrete not only results in saving the dead weight of the structure but has better insulation against heat and sound. This composition makes AAC highly suitable for pre-casting and reshaping. The system, 2 methods, and Calculation. This save both labor and circle time for each floor. We use Aquaerix preformed cellular concrete foam to generate pervious material. 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? You have entered an incorrect email address! Because lightweight concrete is often project-specific, contacting the aggregate supplier before project design is advised to ensure an economical mixture and to establish the available range of density and strength. Most of the lightweight concrete mix is made with lightweight aggregates. It can also help in covering architectural … Concrete with full structural efficiency contain aggregates which fall on the other end of the scale and which are generally made with expanded shale, clay, slates, slag, and fly-ash. Roman Empire, lightweight concrete use was limited until the 20th century when a new type of manufactured, expanded shale, lightweight aggregate became available for commercial use. Or is it due to the high water absorption and drying shrinkages of the blocks. -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. Specific types of lightweight aggregates make varying forms of lightweight concrete. Aerated concrete has the lowest density, thermal conductivity, and strength. Fire and corrosion protection. These vary from lightweight aggregate concrete, foamed concrete, or Autoclaved Aerated Concrete (AAC). For works in-situ, the usual methods of aeration are by mixing in stabilized form or by whipping air in with the aid of an air-entraining agent. Casting structural steel to protect its against fire and corrosion or as a covering for architectural purposes. Heat insulation on roofs. lower than 2.6. Autoclaved aerated concrete (AAC) is a lightweight, precast, foam concrete building material suitable for producing concrete masonry unit (CMU) like blocks. Selection of such aggregates has been investig… Surface rendered for external walls of small houses. Low Sand concrete, in which the voids between the coarse aggregate only partially filled with the paste. In the early 1950s, the use of lightweight concrete blocks accepted in the UK for the load-bearing inner leaf of cavity walls. Fixing bricks to receive nails from joinery, principally in domestic or domestic type construction. Construction of partition walls and panel walls in frame structures. These two reasons are why it is used for lightweight concrete floors, lightweight concrete roofing and lightweight concrete block. Any Help? Concrete is used to construct any structure; the ingredients of the concrete are cement, sand, and aggregates. 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). Most structural LWC are capable of producing concrete with compressive strength in excess of 34.47 N/mm². The light weight concrete is applied for the protection of the steel structures and are also used for the construction of the long span bridge decks. When completed, these platforms are towed to a permanent location to be set on the ocean floor. 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