Along with many advantages, reinforced concrete also poses some disadvantages also. It means a lower overall building height for the same floor-to-floor height. 6-There is also a definite savings stirrups, since shear in post-tensioned concrete is reduced in the inclination of the tendons, and the diagonal tension is further minimized bathe presence of pre-stress. Prestressed concrete can be used to build structures having a longer span as compared to reinforced concrete. 1- P.S.C. Reinforced concrete and prestressed concrete both have steel bars or wires embedded to bolster the material's weakness under tension, but the types of steel and the uses of the concrete are different. members. Prestressed concrete is a form of concrete used in construction. The companies that make prestressed concrete … Autodesk Robot Structural Analysis Professional 2018 [Multilanguage]. Compared to RC counterparts, Prestressing results in lighter members, longer spans and increase in the economy of application of reinforced concrete. This rectifies several deficiencies of concrete. Reinforced concrete, as an economic building material, is very popular nowadays. Advantages of Reinforced Concrete Reinforced concrete has a high compressive strength compared to other building materials. It resists stresses are higher than normal RCC structures and is free from cracks. The composition of reinforced concrete consists of portland cement (usually), water, aggregates of silica sand or gravel, and steel bars, meshes, or synthetic steel fibers. Prestressing tendons (generally of high tensile steel cable or rods) are used which produces a compressive stress that offsets the tensile stress that the concrete compression member would otherwise experience due to self–weight and gravity loads. 10-In areas where there are expansive clays or soils with low bearing capacity, post-tensioned slabs-on-ground and mat foundations reduce problems with cracking and differential settlement. What does 33,43 and 53-grades of cement mean? 10-The high tensile strength & precision of placement gives maximum efficiency in size & weight of structural members. 1. 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. ******* A 80/100 grade bitumen indicates that its penetration value lies between 80 &... HOW TO CALCULATE CEMENT, SAND QUANTITY FOR PLASTERING? 3- Reinforcing schemes are generally designed to resist tensile stresses in particular regions of the concrete that might cause unacceptable cracking or structural failure. Following points should be remembered while calculating the quantity of ceme... WHAT ARE THE ADVANTAGES OF PRESTRESSED CONCRETE OVER R.C.C ? 1. applications of prestressed concrete are many Prestressed concrete. The prestressing of concrete has several advantages as compared to traditional reinforced concrete without prestressing. In contrast to this, in reinforced concrete, only part of the concrete above the neutral axis is effective. Followings are the advantages of prestressed concrete: Followings are the disadvantages of prestressed concrete: Please note that the information in Civiltoday.com is designed to provide general information on the topics presented. What does 33,43 and 53-grades of cement mean? The information provided should not be used as a substitute for professional services. Therefore, Reinforcement concrete system has been created to overcome the weakness of concrete with rapidly development in construction, the concrete technology has to walk parallel with this development. a single beam can run continuously from one end of the building to the other. 8-Thinner slabs mean less concrete is required. A fully prestressed concrete member is usually subjected to compression during service life. In RCC structures, take an example of a beam. Advantages of Prestressed concrete Low maintenance cost is enough. Less deformations (improved serviceability). Prestressed concrete is the most durable, reliable and strongest concrete that is widely used for the construction of mega buildings and bridges. The prestress is introduced by tensioning the tendons. Under live loads the def section is also smaller because of the effectiveness of the entire un-cracked concrete section. The construction activity can be finished in a short period. 7-Crack control helps in constructing high performance water tanks, 8-More aesthetic appeal due to slender sections, 9-Applications of various prestressed techniques enable quick assembly of standard units such as bridge members,building frames, bridge decks providing cost-time savings. Reinforced concrete has a high compressive strength compared to other building materials. WHAT IS THE MEANING OF SOIL REINFORCEMENT? It is widely used in many types building around the world. 3. Advantages and Disadvantages of Prestressed Concrete. The mild steel used in ordinary reinforced concrete has a yield point of 200 N/mm 2 to 300 N/mm 2. Because of fewer joints, maintenance cost also becomes reduced during the design life as joints are the major locus of weakness in a concrete building. (JOB INTE... WHAT ARE THE VARIOUS METHODS OF CONCRETE CURING ( ... What are Daily Activities of Civil Site Engineerin... Two International Finance Center, Hong Kong. It is economical for long-span structure. 1. tural concrete and steel quantities that precast/prestressed concrete can pro-vide. Another advantage, such as excellent fire resistance, low maintenance costs, elegance, high corrosion-resistance, adaptability, etc. Longevity of prestressed structure is greater than rcc structure because the reinforcement stays unaffected from outer agencies. DIFFERENCE BETWEEN ENGLISH BOND AND FLEMISH BOND, Information about Solar Energy system for roof. Reinforced concrete was developed by a nursery owner in Paris in 1867, Joseph Monier, applying it to practical use for the first time (Salmon & Wang, 2007). A large span can be achieved without increasing the member size for the same loading condition. If the loading is downward vertical, then the zone above the neutral axis faces compression and zone below the neutral axis faces tension. The prestressing of concrete has several advantages as compared to traditional reinforced concrete without prestressing. It has made significant contributions to the construction industry, the precast manufacturing industry, and the cement industry. The Prestressed Concretes members are stiffer than R.C.C. 3-This becomes an important consideration for such structures as long cantilevers. Advantages of prestressed concrete - Prestressed member is free from crack, so the resisting impact, shock and reversal of stresses is much more than reinforced concrete. 5(a) illustrates this advantage, based on shoring the Longer span length increases untroubled floor space and parking facilities. This type of construction material represents an improvement over regular concrete. As the span length is larger, fewer joints are needed than traditional RC structures. Advantages: The pre-stressing of concrete has several advantages as compared to traditional reinforced concrete (RC) without pre stressing. The main disadvantage is construction requires additional special equipment like jacks, anchorage, etc. Advantages and disadvantages of Prestressed concrete 2. Concrete weak in tension and strong in compression. By adopting the prestressedconcrete we can achieve the structure which will have less crack or crack freestructure. 2-They do not crack under working loads, and whatever cracks may be developed under overloads will be closed as soon as the load is removed, owing to the cambering effect of pre-stress. : 3–5 This compression is produced by the tensioning of high-strength "tendons" located within or adjacent to the concrete and is done to improve the performance of the concrete in service. (JOB INTERVIEW QUESTION) Concrete weak in tension and strong in compress... Autodesk Robot Structural Analysis Professional 2018 (x64) Multilanguage  ​Autodesk Inc., a world leader in 3D design software for en... What is meant by 80/100 grade bitumen? 7-A lower building height can also translate to considerable savings in mechanical systems and façade costs. With prestressed concrete, the engineer can also design longer spans using the same depth beam. It requires high strength concrete and high tensile strength. Prestressed concrete has the following advantages: Since the prestressing technique removes cracks from the concrete at all stages of loading, the entire section of the structures takes part in the resistance to external load. Fig. 2. 2. Followings are the advantages of prestressed concrete: Longer span length increases untroubled floor space and parking facilities. Prestressed concrete is a method for overcoming concrete's natural weakness in tension. Concrete water tanks are often post-tensioned to reduce crack width and leakage. 5-Post-tensioning allows bridges to be built to very demanding geometry requirements, including complex curves, and significant grade changes. WHAT ARE THE ADVANTAGES OF PRESTRESSED CONCRETE OV... HOW TO IMPROVE BEARING CAPACITY OF SOIL? Longer span length increases untroubled floor space and parking facilities. A pretensioned precast slab can be combined compositely with an in situ concrete topping to produce a slab that provides substantial savings in ma-terials over an equivalent conventional cast-in-place slab. Advantages of Reinforced Concrete. Then the whole section will be in compression and there are no tensile caracks. 3. Therefore, the Prestressed concrete was created to overcome the limit of reinforcement concrete span. 2. The presence of the prestress enables the concrete to carry higher loads without cracking. These concrete reinforcing methods differ in the period they have been used. Advantages of Prestressed Concrete Prestressed concrete can be designed avoiding the tensile cracks in the concrete. 4-Larger spans possible with prestressing (bridges, buildings with large column-free spaces). 9-Improved performance (resilience) under dynamic and fatigue loading. Construction cost is little higher than RCC structures. Prestressed concrete’s discovery dates back to the late 1800’s. Thinner slabs, that are important for high rise building as with the same amount of cost, it can construct more slabs than traditional thicker slabs. A fully prestressed concrete member is usually subjected to compression during service life. Because of better materia… 4. In addition to general advantages, such as excellent fire resistance, low maintenance costs, elegance, high corrosion-resistance, adaptability etc, the prestressed concrete is found to sustain the effects of impact or shock and vibrations. Longer spans results in fewer joints, as a result, less maintenance is needed. Prestressed concrete is used in a wide range of building and civil structures, from bridges to offshore platforms where its improved performance can allow for longer spans, reduced structural thicknesses, and material savings compared with simple reinforced concrete. PT allows longer spans and keeps cracks tight. 12-Suitable for use in pressure vessels, liquid retaining structures. It requires highly skilled workers under skilled supervision. 6-Another advantage of post-tensioning is that beams and slabs can be continuous, i.e. - It is more durable than reinforced concrete. Characteristics of reinforced concrete. Increasing usability , demands , architectural design and making more complicated design for a asthetic convention view , structure are modified which reaches beyound the economic and design limit of normal RCC work. To get regular update and new article notification please subscribe us. A fully prestressed concrete member is usually subjected to compression during service life. If such steel is used and if even it is subjected to stress say 200 N/mm 2 at the stage of tensioning, we find that due to creep and shrinkage of concrete the net tensile stress left over will be extremely low. Start online test with daily RCC and Prestressed Concrete quiz for Gate Civil Engineering exam 2019-20. Pre stressing provides higher strength to depth ratios. 11-Reduces self weight of building thereby reducing the lateral load resisting system. We can achieve the overall economy as by adopting prestressing we can reduce the of the er for higher load smaller C/S can be achieved. 2-Freezing & thawing durability is higher than non prestressed concrete, 3-Section remains uncracked under service loads, 7-Higher moment of inertia (higher stiffness). 9-Pre-tensioning is suitable for precast members produced in bulk. Really good post, this will help me a lot in the futureclick here. The spans of prestressed beams and girders are longer compared with that of reinforced concrete. Longevity of prestressed structure is greater than rcc structure because the reinforcement stays unaffected from outer agencies. Prestressed concrete members are free from cracks and the resistance to the effect of impact, shock, and stresses are higher than rcc structures. 5. In a beam, we have tension zone and compression zone. In the construction of buildings, this means that fewer columns will be required to support the slabs, and also the spacing between them can be kept much larger. It increases the durability of the structure. Prestressed concrete is now a days have a specific role in the modern construction . Concrete reinforcing steel is either solid bars with ribs on them, referred to as reinforcing bar or rebar, or a wire or metal mesh. Reinforced concrete components. Prestressed concrete is a method for overcoming concrete's natural weakness in tension. Bridge designers have used PT both for cast-in-place concrete and for precast segmental construction. At this point , one has a better option in the form of Prestressed concrete . There are two ways of overcoming this problem: Embed another material in the concrete which is strong in tension – reinforced concrete … How to calculate the cement, sand quantity for plastering. Prestressed concrete is a concrete construction material which is placed under compression prior to it supporting any applied loads or defined as Structural concrete in which internal stresses have been introduced to reduce potential tensile stresses in the concrete resulting from loads. As a general rule, traditional reinforced concrete is the most economic method for a span of up to 6 m. Prestressed concrete is more economical when spans are over 9 m. It requires a smaller amount of construction materials. Prestressing tendons (generally of high tensile steel cable or rods) are used which produces a compressive stress that offsets the tensile stress that the concrete compression member would otherwise experience due to self–weight and gravity loads. This rectifies several deficiencies of concrete. It is substantially "prestressed" during production, in a manner that strengthens it against tensile forces which will exist when in service. ******* Cement is a very important building material used in the construction indust... WHAT ARE THE ADVANTAGES OF PRESTRESSED CONCRETE OVER R.C.C? Improve your score by attempting RCC and Prestressed Concrete objective questions paper listed along with detailed answers. Contents:COMPARISON BETWEEN PRESTRESSED CONCRETE, RCC AND ARCHReinforced concrete:Arch:Prestressed concrete: COMPARISON BETWEEN PRESTRESSED CONCRETE, RCC AND ARCH Concrete is a building material strong in compression but relatively weak in tension. 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