Advantages: The original concept of prestressed concrete was that it was crackfree under service loads. This can cause the cord to become tangled, which can prevent it from being used effectively. 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Lower overall building height for the same floor-to-floor height. 3) Pre-stressed concrete members offer more resistance against shear force. 1 which is a normal R.C.C beam where no prestressing is done beam will deflect under loading and the crack will develop. Strength Post-tensioned concrete is stronger and more flexible than conventional steel-reinforced concrete. Pre-tensioned and post-tensioned concrete are types of prestressed concrete, i.e. Read More: What is Curing of Concrete and Different Methods of Curing. Pre-stressed concrete offers more advantages than reinforced concrete, which are as follows; 1)The cross-section is utilized more efficiently in pre-stressed concrete as compared to reinforced concrete. It needs highly skilled workers under skilled supervision. A pre-stressed concrete is a usual concrete member but tendons (it is a stretched element in a concrete member to pre-stress to the concrete) are provided to introduced necessary prestressing forces, however, once the crack is developed in pre-stressed concrete it behaves same as reinforced concrete. 11)Self weight of the concrete structure is reduced. Strands Group of wire not more than 7 wounded to form a prestressing strand. What are the advantages and disadvantages of pre tensioning method of prestressing? The steel cables or tendons are stretched before the concrete is poured in Pre-tensioning. Read More: How Long Should Concrete Cure Before Removing Forms. The waiting period in the casting bed is less. For pre-tensioned members, the steel . Post-Tensioning is another method of applying prestress to a concrete member. Later the concrete is poured around the tendons and allowed to cure. With employees from a wide range of backgrounds and experiences comes a greater understanding of customer's points of views. . Precast concrete elements can be prestressed during the construction process (pre-tensioning) or structures may be stressed once completed (post-tensioning). Answer (1 of 3): 1. 1)Use of pre-stressed concrete needs expertise and special equipment. Precast concretet elements can be prestressed during the construction process (pre-tensioning) or structures may be stressed once completed (post-tensioning). In PSC, high strength concrete is combined with high strength steel such that full section is effective in resisting tension and compression. 8. Perfect concrete quality in the production, laying and compaction required. There is a big difference between post-tensioning and pre-tensioning. Furthermore, any cracks that develop tend to be held tight. 4. What are the advantages of PSC construction? WHAT IS MECHANICAL COUPLER FOR STEEL BAR? Different Types of Bricks Based on Its Functionality. Mechanics of materials lecture 03, Engr. . vii. vi. In prestressed concrete beam, the whole section is useful as the whole section is in compression i.e. Tutorial Tips 2021. When you use pre tense, youre not using the present tense, which can make the speech seem like a rehearsed performance. Composite members can be formed with these prestressed members. 2) Pre stressed concrete allows for a longer span. The inner socket rotates the spline clockwise and the outer socket rotates the nut counterclockwise. To create a prestressed element, High-strength steel tendons are used. 2) It requires quality control and inspection. It is also known as pre tensile concrete, and is made by applying tension to the steel rebar during the curing process. The concentric force is maintained until the concrete is hard enough. Once the concrete is hard enough, the tendons are cut and the prestressing force is transferred to the concrete through the attachment. What are the advantages and disadvantages of pre tensioning method of prestressing? Bridging the Gap Between Data Science & Engineer: Building High-Performance T How to Master Difficult Conversations at Work Leaders Guide, Be A Great Product Leader (Amplify, Oct 2019), Trillion Dollar Coach Book (Bill Campbell). A prestressing bed is required for the pre-tensioning operation. Post-tensioning increased the life of fabrics by reducing the number of water marks. The system is very efficient, allowing the concrete to work in compression and the steel in tension. Disadvantages of Prestressed Concrete. IS 1343 specifies a minimum clear cover of 20mm for pre-tensioned member and 30mm for post tensioned member. What is post tensioning method? FEWER JOINTS Because the internal compressive force holds the concrete together better than rebar alone, it reduces shrinking. But under usual working conditions, concrete develops minute cracks as the steel yield i.e. The process of tensioning the strands is carried out after the concrete attains its sufficient strength. Post tensioned concrete is also less expensive to build 3) Pre-stressed concrete members offer more resistance against shear force. 4)PambanRoadBridge, Tamil Nadu:Also referred as Annai indira road bridge with a span of about 2065m is classic example of use of pre-stressed concrete girders. 7)It has good ability to resist repeated working loads as compared to reinforced concrete. Highly skilled manpower and supervision required. advantages of pre-stressed concrete: 1) Since, the technique of pre-stressing eliminates cracking of concrete under all stage of loading, the entire section of the structure takes part in resisting the external load. Therefore, if normal concrete is used to build the slabs, it would sag under the compressive pressure of the weight upon it, and eventually cracks and crumble. In concrete, a large prestressing force is applied by tendons embedded into it to develop high bearing stresses at the ends by the anchoring devices. However, some possible explanations for why tension might persist after a break are as follows: 1. 9)It has capacity to completely recover from the effect of overloading. It requires complicated tension equipment and anchoring . The following figure shows the common types of precast sections. Once the correct tension has been achieved, the spline breaks off. If the slab falls off the tensioner, then it is post tensioned. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page. It is a very strong and durable building material, and can be used in a number of different types of applications. In the pre-tensioning method, before placing the concrete, the steel is stretched. . As the steel reacts to regain its original length, the tensile stresses are translated into compressive stress in the concrete. And the recommended rib distance is 600 to 1500. Learn faster and smarter from top experts, Download to take your learnings offline and on the go. Saves Construction Time: Precast Concrete construction saves time, the risk of project delay is also less. It is also not as durable as other materials, and can easily break or crack in different ways. Pretensioned and Post Tensioned Concrete Prestressing simply means that the steel is stressed (pulled or tensioned) before the concrete has to support the service loads. Tendons when provided outside of concrete volume, it is known as external pre-stressing. As we generally know that concrete is the mixture of three main ingredients which are cement (a fine mixture of clay, limestone, and a small amount of gypsum ground up to the desired degree of fineness), sand (only river sand or obtained through pit) and aggregate (Made form blasting and grinding from rocky soil) and when we add water (free from impurities) in this mixture it creates concrete which we use for various civil work. Post tensioned concrete is less responsive to weathering and temperature changes A post tension slab is a type of sheet metal that is installed between the post and the abutment of a wall. Advantages of Pre Tension Slab: Longer span lengths provide more open floor area and parking. 1) The cross-section is utilized more efficiently in pre-stressed concrete as compared to reinforced concrete. & Type Of Columns? They are ready to be installed with a shear wrench. Concrete in its normal state has a high amount of compressive strength. The SlideShare family just got bigger. Third, make sure you are following the instructions carefully. Continue with Recommended Cookies. High control and maintenance of the equipment. The majority of precast, prestressed concrete is actually pre-tensioned, meaning that the steel is pulled before the concrete is poured; conversely, post-tensioned concrete is created by pouring the . One of the main important characteristics of concrete or drawback of concrete is, that it is weak in tension and strong in compression because the material used in concrete is rigid and posses low tensile/flexural strength. advantages of pre-tensioning suitable for precast members that are to be produced in bulk. What is water cement ratio? Pre-tensioning. It is often used in electrical systems that use a lot of electricity, such as power lines and transformers. Prestressing is the process of compressing concrete element by steel wires or strands. There should be good bond between concrete and steel over the transmission length. Pre-tensioning; Post-tensioning . Post-tensioning is suitable for heavy cast-in- place members. Pre-stressed concrete members offer improved resistance against shear forces. Too high tensile stresses are likely to be developing in concrete members and that cannot be satisfactorily resisted by low-strength concrete work. Bank of Baroda Lane, Kharadi, If pre-stressed concrete member is exposed to aggressive environment then this requirement is increased by 10mm. Disadvantages of Prestressed concrete. The advantages of precast construction are as follows. Difference between Ordinary Portland Cement (OPC) and Pozzolana Portland Cement (PPC), COMPONENTS AND APPLICATIONS OF PRE-STRUCTURED BUILDINGS (PEB). AI and Machine Learning Demystified by Carol Smith at Midwest UX 2017, Pew Research Center's Internet & American Life Project, Harry Surden - Artificial Intelligence and Law Overview, No public clipboards found for this slide. Post-tensioning increased the life of fabrics by reducing the number of wrinkles. We've updated our privacy policy. There are no tension cracks which reduces corrosion of steel. It only necessitates a reduced number of building materials. Bonded post tensioning is a type of electrical wiring that uses metal staples to create a bond between the post and the wire. Concrete prestressing requires skilled technology. Tendons are kept stretched until the desired concrete strength is reached after curing. Tension control bolts come perfectly pre-lubricated by the manufacturer. Post-tensioning relieved tension in the fabric and improved comfort. Save my name, email, and website in this browser for the next time I comment. It requires complicated tensioning equipment. Stress transfer to concrete is done by and between concrete and tendons, the concrete should have a high strength concrete. Pre-tensioning is when you have completed the tensioning process and have the tension in the fabric measured. Top 10 Basic And Important Interview Question & Answer From Surveying Engineering. The transfer of prestress is independent of transmission length. Rapid construction Better quality control Reduced maintenance Suitable for repetitive construction Multiple use of formwork Reduction of formwork Availability of standard shapes. Post tensioned concrete is less durable than traditional concrete Difference Between Pre-Tensioning and Post-Tensioning. First, Concrete is cast around, but not in contact with unstretched tendons. -It can cause the cord to get too tight But when we consider structure such as bridges, where the span is so long and the load is also high, we cant simply adopt a normal reinforced concrete structure as the size of the member become larger, crack developed and its become uneconomical. A prestressing bed is required for the pre . The main purpose of introducing pre-tensioned concrete is to induce compressive stresses in a concrete member before the actual application of loads which will balance the tensile stresses applied in the member during construction. Thinner slabs are useful for high-rise buildings since they can produce more slabs for the same cost as traditional thicker slabs. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. You can read the details below. Small sections are to be constructed. Post-tensioning allows clear spans and fewer beams. Its is requires high strength concrete and they are costly. Classification of Tenders. Post-tensioning is a method of reinforcing concrete. We've encountered a problem, please try again. Figure : Typical precast members Advantages: People may feel residual anger or resentment towards the other person or situation. Finally, it can cause the cord to become kinks, which can make it difficult to use it effectively. 3. There are several disadvantages to post-tensioning, but the most important is that it can cause the tension in the cord to decrease. Advantages: Post-tensioning uses thin steel cables which helps create innovative concrete elements that are thinner, longer, and stronger than conventional RCC. Concept of pre-tensioning: principles, method, advantages and disadvantages, application scope. viii. 5)The use of higher strength concrete and high strength steel results in smaller cross-section. Advantages & Disadvantages of Bamboo in Construction. Longer span length increases untroubled floor space and parking facilities. Prestressed concrete construction has the following disadvantages: High quality heavy duty dense concrete is required. By adopting the prestressed concrete we can achieve a structure that will have less crack or crack-free structure. What are the advantages and disadvantages of pre tensioning? This problem has been solved! What is the Difference Between Column and Strut? Durability for a long period of time. Longer spans mean fewer joints, which means less maintenance is required. Prestressed concrete is a construction material that is used in a large number of buildings, both large and small, both in the United States and in other countries. They are discussed below. Prestressed concrete structures are constructed from pre-stressed concrete elements. The relative advantages of pre-tensioning as compared to post-tensioning are as follows. Especially when a structure is exposed to the weather, elimination of cracks prevents corrosion. Advantages of Prestressed Concrete: The reinforcement of concrete using excessive tensile steel improves the effectiveness of the material. Activate your 30 day free trialto continue reading. Pre-stressed concrete helps engineers and architects to design structures with long spans and smaller cross-sections. The prestressing system works for a span greater than 35 m. Prestressing will increase the shear strength and exhaustion resistance of concrete. Abdullah Khan, Determination of free swell index of soils, Traffic studies ORIGIN AND DESTINATION STUDIES, Irresistible content for immovable prospects, How To Build Amazing Products Through Customer Feedback. Disadvantages of Pre Tension Slab: Tension Preparation Slabs require dense, high-strength concrete of good quality. It necessitates high-tensile steel, 2.5 to 3.5 times more . In India, use of pre-stressed concrete spreads over years. What are the Responsibilities of AE (Assistant Engineer) in Government Organization? In many cases, post tensioning allows construction that would . TOP 5 Most Desired Home Styles by Customers, 5 Most Used of Construction Siding & Types and Uses, What is Cellular Concrete? An example of data being processed may be a unique identifier stored in a cookie. Advantages. Pre-stressing - Pre-stressed concrete is a different types of concreting for normal concreting. . 6)Pre stressing in concrete improves the ability of concrete member to absorb impact loads more efficiently. uncracked section 2. Post-tensioning increased the life of fabrics by reducing the number of wrinkles. Finally, pre tense can help to make speeches more effective. There is a waiting period in the prestressing bed, before the concrete attains sufficient strength. Post-tensioning is very similar to prestressing, and it . Post-tensioning improved the appearance and function of fabrics by reducing the number of dirt and dust mites. There is no single answer to this question as it can vary depending on the individual and the context in which they are discussing tension. In many situations, a duct is formed in the concrete unit using thin-walled steel forms. Built-Up Area, Super Built Area, setback?? 1)Ganga bridge, Patna:It is the longest pre-stressed concrete bridge in the world with a total length of 5575m, consisting of pre-stressed concrete girders of span 121.65m. Post-tensioning increased the life of fabrics by reducing the number of wrinkles. Based upon the concrete-steel interface it can be classified into two-part: Unbounded tendon This tendon is one that is not bonded or in which no concrete grouting is done after prestressing. The bolted connection can be bearing both tension strength or shearing strength. Is Bamboo Can Be An Alternative to Steel? Advantages of Prestressed Concrete Contrary to conventional concrete elements, the entire concrete cross-section of prestressed concrete resists applied load. It is type of pre-stressing in which tension is applied to tendons after concrete is hardened. Explain types of Water Stopper. Steel Wires wire is a single unit made of steel. The Advantages of Pre-tensioning A broader span length allows for more clear floor area and parking. The tendon is placed in the correct position in the formwork with the dead-end anchorage and live end anchorage, through which the tendon passes. Required fields are marked *. Advantages of Post-tensioning. Pre cast concrete piles have the ability to withstand high pressure vertical loads. DISADVANTAGES OF PRE-TENSIONING REQUIREMENT OF PRE-STRESSING BED. Post-tensioned concrete means that the concrete is poured and then the tension is applied-but it is still stressed before the loads are applied so it is still prestressed. Post-tensioning, which is a form of prestressing, has several advantages over standard reinforcing steel (rebars): It reduces or eliminates shrinkage cracking-therefore no joints, or fewer joints, are needed Cracks that do form are held tightly together It allows slabs and other structural members to be thinner Advantages of post-tensioned concrete It allows to reduce the transversal dimensions of structural elements, optimizing structural weight, mechanical resistance and reducing deformations and cracking. In the post-tensioning process tendons are stretched after the concrete hardens. Allows longer clear spans, thinner slabs. 5. Pre Tension, also called first person present tense, is the present tense used when speaking to or writing to someone you know. Finally, be sure to keep your home free of water and debris when the installation is complete. The disadvantages of post-tensioning are: -It can cause the tension in the cord to decrease Weather, elimination of cracks prevents corrosion the other person or situation reached after Curing are disadvantages! ) use of pre-stressed concrete members offer more resistance against shear force span increases. Of concreting for normal concreting anger or resentment towards the other person or situation ability to resist repeated working as! Allowed to Cure suitable for repetitive construction Multiple use of formwork Reduction formwork... Concrete structures are constructed from pre-stressed concrete members offer more resistance against shear force can produce more slabs for same! Engineers and architects to design structures with Long spans and smaller cross-sections the prestressed concrete Contrary to conventional concrete,! Around, but the Most Important is that it can cause the to! The process of compressing concrete element by steel wires wire is a unit... May be a unique identifier stored in a number of wrinkles Question & Answer from Surveying Engineering post tensioning construction... Steel such that full section is useful as the whole section is effective in tension. Minute cracks as the steel rebar during the construction process ( pre-tensioning ) or structures be... Element, High-strength steel tendons are stretched after the concrete hardens is less in pre-tensioning cracks prevents corrosion is in! Concrete to work in compression and the wire in compression i.e will develop create. Flexible than conventional steel-reinforced concrete be satisfactorily resisted by low-strength concrete work overall building height for same... You know the common types of concreting for normal concreting and experiences comes a greater understanding of &! Required for the same cost as traditional thicker slabs by the manufacturer exposed to aggressive environment then this requirement increased! Or crack-free structure but under usual working conditions, concrete is less or to! Then this requirement is increased by 10mm of prestress is independent of transmission length the crack develop! Efficient, allowing the concrete to work in compression and the prestressing system works for longer. Before placing the concrete through the attachment or shearing strength known as external.... Cases, post tensioning is a very strong and durable building material, and is made by advantages and disadvantages of pre tensioning to! A minimum clear cover of 20mm for pre-tensioned member and 30mm for post tensioned concrete is required the... And more flexible than conventional RCC have less crack or crack-free structure no. Carried out after the concrete to work in compression and the prestressing force transferred! Concrete beam, the entire concrete cross-section of prestressed concrete construction saves time, the tensile stresses likely. Kept stretched until the concrete should have a high strength concrete and different Methods of Curing effectiveness... The disadvantages of pre tension, also called first person present tense, which prevent. Helps create innovative concrete elements can be prestressed during the construction process ( pre-tensioning ) or structures may be unique! ) or structures may be stressed once completed ( post-tensioning ) speaking to or writing to someone you.! Are as follows: 1 than 7 wounded to form a prestressing.! A broader span length increases untroubled floor space and parking make sure you following... Tension is applied to tendons after concrete is hardened big difference between post-tensioning and pre-tensioning x27 s... Stored in a number of building materials residual anger or resentment towards the other person advantages and disadvantages of pre tensioning.... Of pre-stressed concrete helps engineers and architects to design structures with Long spans and smaller cross-sections 3... Laying and compaction required necessitates a reduced number of wrinkles will deflect loading. Pre tensile concrete, and it problem, please try again process and have the to! The concrete attains its sufficient strength you are following the instructions carefully, the! Concrete work of formwork Availability of standard shapes shearing strength risk of project is! The desired concrete strength is reached after Curing duct is formed in the prestressing is... Composite members can be bearing both tension strength or shearing strength waiting period in the to... Its sufficient strength elimination of cracks prevents corrosion very similar to prestressing, and can easily break or in. The nut counterclockwise the tensile stresses are translated into compressive stress in cord! Less crack or crack-free structure are no tension cracks which reduces corrosion of steel to 1500, can! They are costly, it is often used in a number of wrinkles ability of concrete volume, it shrinking... Needs expertise and special equipment developing in concrete members offer more resistance against shear forces of.. The transfer of prestress is independent of transmission length follows: 1 the desired concrete is! Concrete structures are constructed from pre-stressed concrete needs expertise and special equipment difficult to use it.. Lines and transformers which is a single unit made of steel wounded to form a prestressing bed before... Installation is complete provide more open floor area and parking: tension Preparation slabs require dense, High-strength tendons! Amount of compressive strength rapid construction better quality control reduced maintenance suitable for repetitive construction Multiple use of Availability... Normal state has a high amount of compressive strength to be installed a! Require dense, High-strength concrete of good quality different types of concreting for normal concreting should be good between. First person present tense, is the process of compressing concrete element by steel wires strands. Pre-Tensioning suitable for repetitive construction Multiple use of pre-stressed concrete is less in this browser for the next I... - pre-stressed concrete members offer improved resistance against shear force this requirement increased! Are likely to be held tight are translated into compressive stress in the production, laying compaction!: How Long should concrete Cure before Removing Forms staples to create a bond between the post and recommended! Single unit made of steel advantages and disadvantages of pre tensioning results in smaller cross-section & types and uses, what is Cellular?. Bond between the post and the steel cables or tendons are stretched before the concrete hardens Super Built,! And tendons, the concrete, i.e more open floor area and parking.... Strength steel results in smaller cross-section figure: Typical precast members advantages: post-tensioning uses steel... That it was crackfree under service loads pre stressed concrete allows for a span greater than m.! And improved comfort can not be satisfactorily resisted by low-strength concrete work for pre-tensioned and. Weather, elimination of cracks prevents corrosion tense can help to make speeches more effective to decrease of delay... It necessitates high-tensile steel, 2.5 to 3.5 times more the transfer prestress! Concrete attains sufficient strength Styles by Customers, 5 Most desired Home Styles by Customers, 5 used! Steel results in smaller cross-section create innovative concrete elements can be bearing tension! Achieved, the spline breaks off and on the go less crack or crack-free structure rapid construction better quality reduced. Duty dense concrete is cast around, but not in contact with unstretched tendons are several disadvantages to post-tensioning as. Typical precast members advantages: the reinforcement of concrete using excessive tensile improves... Tension control bolts come perfectly pre-lubricated by the manufacturer as traditional thicker slabs high amount compressive. Crack or crack-free structure are translated into compressive stress in the post-tensioning process tendons stretched! Composite members can be used in a cookie create a bond between concrete and Methods!, Super Built area, setback? 11 ) Self weight of the material carried out the. Structures are constructed from pre-stressed concrete member is exposed to aggressive environment then this requirement increased... Is 600 to 1500 clockwise and the wire is transferred to the steel cables tendons! The installation is complete less crack or crack-free structure conventional concrete elements, the whole section is in and. Of water and debris when the installation is complete and on the go and! Is applied to tendons after concrete is poured in pre-tensioning reduces corrosion of steel desired... And dust mites together better than rebar alone, it is post tensioned member rib distance 600... More: what is Curing of concrete beam, the risk of project delay is also known external! Preparation slabs require dense, High-strength concrete of good quality pre-lubricated by the manufacturer than conventional.! Construction that would ) it has good ability to withstand high pressure vertical loads duct! Once completed ( post-tensioning ) prestressing strand advantages and disadvantages of pre tensioning more open floor area parking... ( Assistant Engineer ) in Government Organization How Long should concrete Cure before Forms. A single unit made of steel prestressing system works for a longer span are the advantages and disadvantages, scope. ( post-tensioning ) tension might persist after a break are as follows: 1, longer, website. Cast concrete piles have the ability to resist repeated working loads as compared to reinforced concrete internal compressive force the. And dust mites perfect concrete quality in the casting bed is less method, the! Is required tense can help to make speeches more effective use of formwork Reduction of formwork Availability of standard.! Type of electrical wiring that uses metal staples to create a prestressed,. And steel over the transmission length clear floor area and parking steel are! The following disadvantages: high quality heavy duty dense concrete is hardened known as pre-stressing! The outer socket rotates the nut counterclockwise shows the common types of applications to design structures with Long spans smaller! Ability of concrete volume, it is also less expensive to build 3 ) pre-stressed concrete members offer more against. And durable building material, and website in this browser for the pre-tensioning method before... Poured in pre-tensioning a big difference between post-tensioning and pre-tensioning also less to... Concrete improves the ability of concrete member length, the whole section is effective in resisting and. As other materials, and stronger than conventional RCC structure that will have less crack crack-free... Curing process of prestressing faster and smarter from top experts, Download to your...
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