Save my name, email, and website in this browser for the next time I comment. GAVIN THOMAS HOW TO INCREASE REPETITION VALUE OF PLYWOOD? Perfect quality concrete in production, placement and compaction is required. You can connect me on Google +. -Major advantage of reinforced concrete is that the steel is protected form corrosion by the alkaline action of the concrete -Disadvantage of reinforced is that as concrete and steel have diff thermal expansion coeff, the structure would tear itself apart during temp variation Notify me of follow-up comments by email. Unlike natural stones, concrete is free from defects and flaws. The concrete plays a very important role in all branches of civil engineering. Extra labour cost for prestressing is also there. GAVIN THOMAS The objective is to increase the tensile strength of the concrete, introducing an internal compression force that partially counteracts the tensile stress produced by the service loads in the structural element . This rectifies several deficiencies of concrete. Prestressed concrete members are free from cracks and the resistance to the effect of impact, shock, and stresses are higher than rcc structures. In addition, there are advantages to be gained by prestressing when conditions are favorable to its use. 4. 2. Let’s discuss the advantage of the prestressed concrete. Thanks for the interesting article on prestressed concrete. January 30, 2020, 1:23 am, by HOW TO DO QUALITY CONTROL OF CONCRETE 3. Advantages and disadvantages when partial prestressing is done . It requires high tensile steel, which is 2.5 to 3.5 times costlier than mild steel. January 29, 2020, 10:21 pm, by 3) It … Prestressing is used mainly to make beams and piers in such construction as highway overpasses and commercial buildings. Prestressed concrete has a large amount of, both, compressive as well as tensile strength. Because of better material (i.e. 7 FACTORS INFLUENCING REBOUND HAMMER TEST OF CONCRETE. This way of providing tensile strength can guarantee an inadequate resistance to the element and has the disadvantage of not preventing cracking of concrete for certain load levels. Advantages and disadvantages of Prestressed concrete 2. Followings are the disadvantages of prestressed concrete: It requires high strength concrete and high tensile strength steel wires. The dead weight of the reduced load of the structure results in savings in the costs of the foundations. With the arrival of prestressed concrete, which has now been possible for the construction of large lights. It requires a smaller amount of construction materials. 1. This needs cement with high strength and metal wires with high tensile strength. To know the advantages of precast concrete click here, https://www.youtube.com/watch?v=Tnvd9OUPu3A. It is used to build long bridges, building slabs, etc. The unit cost of high strength materials being used is higher. The construction requires perfect supervision in all stages of construction. The use of the tendons and the curve before the compression of the concrete helps resist the cut. Concrete can be manufactured to the desired strength with an economy. Prestressed concrete requires high-quality dense concrete of high strength. GAVIN THOMAS The companies that make prestressed concrete tanks are Crom , DYK , Natgun , and Preload . March 9, 2020, 6:58 pm, by As the concrete does not crack, the possibility of steel corrosion and deterioration of concrete is minimized. This rectifies several deficiencies of concrete. Advantages of Concrete. Masonry walls can be post-tensioned-this is usually done with a solid steel bar fastened to the foundation and stressed with a … January 30, 2020, 12:56 pm, by 2. The prestressed concrete beams the deviation is usually low. HOW TO DECIDE MAXIMUM SIZE OF COARSE AGGREGATE TO BE USED IN CONCRETE? High quality heavy duty dense concrete is required. Advantages and disadvantages of Prestressed concrete 1. The prestressed concrete is much more usable in the construction of bridges, railway sleepers, and dams. Disadvantages of Prestressed Concrete. The following are among the advantages of using prestressed concrete. Post was not sent - check your email addresses! Prestressing is uneconomical for short spans and light loads. This is the concept of prestressed concrete.As per the ACI committee, pre… The reactions are therefore required much smaller than that required in reinforced concrete. These structures have low cost and are safe from cracks. Advantages of Prestressed Concrete: 1. Extra initial cost is incurred due to use of prestressing equipment and its installation. Prestressing is uneconomical for short spans and light loads. When fully pre-stressed members which free from tensile stresses underworking loads having more efficiency. The neutralization of dead load is important in large bridges. In the most usual way used today, the prestressing materializes by embedding in the concrete steel cables with a suitable layout that are put into traction prior to the commissioning of the structure. January 22, 2020, 6:43 pm. This technique is used to control cracks in large span constructions, it is mostly used for bridges. Bearing this in mind, it is easy to notice that if we want to use concrete in elements, which under service loads, must resist tractions, it is necessary to find a way to supply this lack of tensile strength. Under professional management, this needs highly skilled workers. The following text broadly mentions the advantages of a prestressed concrete member with an equivalent RC member. This technique is used to overcome the natural weakness of concrete against efforts traction , and was patented by Eugène Freyssinet in 1920. Subject topics: Advantages of prestressed concrete Subject layout: The possibility of avoiding permanent cracks is one of the major advantages of prestressed structures. 2. Generally, masonry is substantially very strong in compression however it is considerably weak in tension and this is the cause of limitation of masonry utilization in structural member which are subjected to tension force. PARTIAL PRESTRESSING: The degree of prestress applied to concrete in which tensile stresses to a limited degree are permitted in concrete under working load. High strength steel is required, which is 2.5 to 3.5 times more expensive than mild steel. Fresh concrete is flowable and is in liquid state. Most of the prestressed members are precast and therefore all the advantages or precast concrete hold true for prestressed concrete also. In addition, there are advantages to be gained by prestressing when conditions are favorable to its use. February 26, 2020, 11:03 pm, by HOW AGGREGATE PROPERTIES INFLUENCE THE PROPERTIES OF FRESH CONCRETE? controlled concrete and high tension steel) being used and nullifying the effect of dead loads, smaller deflections are caused. The following text broadly mentions the advantages of a pre-stressed concrete member with an In pre-stressed concrete, prefabricated blocks and elements can be accepted and used as a unit. This saves on the cost of formwork and the centering of large structures. by The History Guy: History Deserves to Be Remembered Recommended for you The amount of steel required for prestressing about 1/3 of that required for reinforced concrete, although the steel for prestressing must be of high strength. It permits the use of large spans (greater than 30 m) with shallow members, even when heavy load are encountered. Disadvantages of Prestressed Concrete. The stress is usually imposed by tendons of individual hard-drawn wires, cables of hard-drawn wires, or bars of high strength alloy steel. It increases the durability of the structure. The initial cost is incurred due to the prestressing equipment and its installation. Robertson, Phillips, and the History of the Screwdriver - Duration: 16:25. No featured entries match the criteria. For more information please refer to the documentation. One way to prevent cracks from appearing, and therefore eliminating the dead weight of cracked concrete, is to introduce additional forces that compensate for the effect of the external actions so that, when the external actions and these additional forces act together, their effects they compensate. Concrete can be … It permits the use of large spans (greater than 30 m) with shallow members, even when heavy load are encountered. The cost of high strengthmaterials being used is higher than the normal RCC. 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