Fines materials are used for a better supply. They are made workable enough for an easy conveyance. That is the reason for its vast usage inroads. They are vastly used in the highways, airports, as well as in the embankments. Asphalt ConcreteĪsphalt concrete is a combination of aggregates and asphalt. They are also used in building construction, where the work should be done fast. Because its hardening time is significantly less, it can be hardened in just a few hours. This type of concrete is mostly used in underwater construction and in repairing roads. They provide better thermal insulation and also have a great appealing look as compared to other types. When the recycled glass is used as an aggregate in the concrete, this type of concrete is known as Glass Concrete.
Air entrained concrete is more resistant to Scaling, Deterioration due to freezing and thawing, and Abrasion. The air entrainment is achieved by adding a small quantity of foaming or gas-forming agents at the mixing stage.įatty acids, fatty alcohols, and resins are some common air-entraining agents. The Volume of air thus, entrained may range between 3-6 percent of the concrete. It is a specially prepared plain concrete in which air is entrained in the form of thousands of uniformly distributed particles. The prestressed concrete is greatly favored in constructing bridges, long-span roofs, and most structures with a heavy dead load.Lighter members can be used than the un-tensioned (normal) reinforced-concrete.This eliminates the necessity of stirrups to a great extent.
The shear resistance is greatly reduced.The risk of the development of tension cracks in the lower sections of beams is considerably reduced.The potential compressive strength of concrete gets considerably increased.Some of its advantages are the following. It is a special type of reinforced concrete in which the reinforcement bars are tensioned before being embedded in the concrete. The construction industry’s latest trend is to shift more and more to prefabricated concrete units in building construction.Even steam curing is used to obtain precast products having high strength in much less time. Perfect curing, under the controlled conditions of temperature and humidity.Careful handling during transport and placement in the perfect design molds.Thorough mixing of the cement, aggregates, and water to obtain the mix of the desired design and consistency.Perfect proportioning of the ingredients of concrete.These structural and decorative members are prepared in a well-equipped place where all arrangements are made for: Some of the examples of Precast Concrete are precast poles, fence posts, concrete lintels, staircase units, concrete blocks, and cast stones, etc. However, they are not used in construction until they are completely set and hardened in a controlled condition. This term refers to numerous types of concrete shapes that are cast into molds either in a factory or at the site. Thus, the resulting material (RCC) is capable of bearing all types of stress in any construction. The steel reinforcement is cast in rods, bars, meshes, and all conceivable shapes.Įvery care is taken to ensure the maximum bond between the reinforcement and the concrete during the setting and hardening process. In fact, it is because of the combined action of plain concrete (having high compressive strength) and steel (having high tensile strength). In this concrete type, steel in various forms is used as reinforcement to give very high tensile strength. It is also called RCC (Reinforced Cement Concrete). It is mostly used in atomic power plants and other similar structures because it protects all types of radiation. Among such materials, Barytes is the most commonly used material, which has a specific gravity of 4.5. These types of concrete are prepared by using high density crushed rocks as coarse aggregates. In this concrete type, the density varies between 3000-4000 Kg/m3. This type of concrete is also called heavyweight concrete. Lightweight Concretes are used, depending upon their composition, for thermal insulation, for protecting steel structures, they are also used in long-span bridge decks, and even as building blocks. But the thermal conductivity of Lightweight concrete is about 0.3. The single important property of lightweight concrete is its very low thermal conductivity.įor example, Thermal conductivity – the k value for plain concrete may be as high as 10-12.
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