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Sr No Pre tensioning method Post tensioning method 1 It is done in the factories thus suitable for precast construction works It can be done in factories as well as on the site 2 Small sections are to be constructed Size of member is not restricted long span
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2020 4 5 nbsp 0183 32 Pre Tensioning VS Post Tensioninghttps youtu be yOuk DSuTb0Difference Between Prestressed Concrete amp Reinforced Concretehttps youtu be nq No4sfKq8Differe
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Post tensioning is used in this manner in millions of square feet of warehouse floors sport courts housing and specialized paving applications Post tensioning elevated concrete beams and slabs can result in thinner concrete sections and or longer
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post tensioning range are second to none Versatile lightweight and compact but immensely strong CCL s range of bespoke and standard systems gives engineers and contractors the flexibility they need to deliver cutting edge contemporary structures on time
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Types of Post Tensioning Bonded Tendons Bonded post tensioned concrete is the descriptive term for a method of applying compression after pouring concrete and during the curing process in situ The concrete is cast around a plastic steel or aluminium
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Unbonded post tensioned concrete differs from bonded post tensioning by providing each individual cable permanent freedom of movement relative to the concrete To achieve this each individual tendon is coated with grease generally lithium based and covered by a plastic sheathing formed in an extrusion process
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2017 3 14 nbsp 0183 32 Post tensioning is a method of reinforcing concrete High strength steel tendons are positioned in ducts or sleeves before the concrete is placed Once the concrete has gained strength tension is then applied pulling the tendons and anchoring them against the outer edges of the concrete before service loads are applied
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Post tensioning tendons which give pre tension to the steel ropes inside the channels and sleeves are placed in the area before the concrete is placed Then once the concrete has strengthened the ropes are tightly pulled or stretched and abutted against the outer edges of the concrete before the load is applied
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2021 8 10 nbsp 0183 32 Bonded Post Tensioned Concrete In this types of prestressed concrete like pre stressing however here concretes are poured first and then tendons are tensioned Tendons are put in the appropriate spots in the part and then casting is finished After the concrete turns out to be hard the tendons are tensioned by water powered jacks against
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smooth rigid steel pipe this type of duct used for the external portion of post tensioning ducts for external tendons deviating in a location such as segmental bridge and deviator locations as shown in figure 2 steel pipe is prefabricated to the required radius and curvature steel pipe should conform to ASTM A53 A53M
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2016 9 5 nbsp 0183 32 Post tensioning also allows extremely long span bridges to be constructed without the use of temporary intermediate supports This minimizes the impact on the environment and avoids disruption to water or road traffic below In stadiums post tensioning allows long clear spans and very creative architecture
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2013 11 1 nbsp 0183 32 1 4 Post tensioning Systems and Devices This section covers the following topics Introduction Stages of Post tensioning The couplers are tested to transmit the full capacity of the strands or bars A few types of couplers are shown Figure 1 4 15
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Post tensioning can help create innovative concrete components that are thinner longer and stronger than ever before Many of today s high performance concrete structures including many landmark bridges and buildings employ some type of prestressing Parking garages high rise residential towers and many other kinds of structures
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2016 12 9 nbsp 0183 32 Post tensioning is of two main types – unbonded and bonded In unbonded post tensioning there is no bond between the pre stressing steel and the concrete surrounding it anywhere except at the anchorages Monostrand tendons are the most commonly used
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Post tensioning is a technique for reinforcing concrete Post tensioning tendons which are prestressing steel cables inside plastic ducts or sleeves are positioned in the forms before the concrete is placed Afterwards once the concrete has gained strength but before the service loads are applied the cables are pulled tight or tensioned
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Post Tensioning – Types Post Tensioning – Process Advantages Application Bridges Tanks Design supply and erection of precast concrete components Design and construction of building with alternative proposal Structural repair and strengthening works
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VSL post tensioning systems are certified according to European Technical Approval which can be used in all EU EFTA countries A post tensioning tendon consists of strands duct and anchorages Tendons of the multistrand VSL system may be made up of as much as 55 seven wire strands of 15 7 mm 0 6 S in diameter with a guaranteed ultimate strength of 1860 MPa
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The Post Tensioning Association in its Guidance Note identifies four types of post formed penetration that are categorised according to the effect the operation will have on structural integrity The first of these relates to the smallest holes no more than 20mm in diameter involving no tendon cutting and which offers minimal risk to the structural integrity of the slab
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2016 11 16 nbsp 0183 32 Types of PRESTRESSING There are two types of prestressing tensioning 6 Pre Tensioning 7 Contd 8 Post Tensioning Post tensioning is done at a project site and requires little to no modifications of the same forming system that would be used to construct non pre stressed concrete
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Answer 1 of 2 According to the construction method there are two kinds of prestressed concrete Pre tensioned Concrete In this method wires or tendons are tensioned at first and concrete is poured later It creates a good bondage between the tendon and
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A Post Tensioning Anchorages is a mechanical device consisting of all components required to transfer the post tensioning force from the prestressing steel to the structure in addition Its including all accessories for grouting Furthermore Stressing anchorage is the most common form of post tensioning system
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1 POST TENSIONED CONCRETE IN BUILDING CONSTRUCTION POST TENSIONED FOUNDATIONS 1 Introduction While the use of prestressing in superstructures is well established foundations have only rarely been prestressed Apart from certain technical
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2017 11 18 nbsp 0183 32 Post tensioning in Prestressed Concrete 1 POST TENSIONING DEVICES AND SYSTEMS PRESENTATION BY DAVINDERPAL SINGH 2 POST TENSIONING THE TENSION IS APPLIED TO THE TENDONS AFTER HARDENING OF THE CONCRETE MINIMUM GRADE OF CONCRETE USED IS 30 MPa DUCTS ARE PROVIDED IN THIS TYPE OF
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Post tensioning also allows early stripping of formwork accelerating floor construction PT slabs are thinner than reinforced concrete slabs and so a larger area can be poured for the same volume of concrete
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2017 3 9 nbsp 0183 32 Live End Post tensioning Anchorage Electrically insulated post tensioning Some other types of live anchorages includes Electrically insulated anchorages and external types Electrically insulated anchorages are used were protection of pre stressing cables from corrosive agents is required from corrosive agents is required
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TYPES OF POST TENSION METHODS 1 Freyssinet System Freyssinet system was introduced by the French Engineer Freyssinet and it was the first method to be introduced High strength steel wires of 5mm or 7mm diameter numbering 8 or 12 or 16 or 24 are grouped into a cable with a helical spring inside Spring keeps proper spacing for the wire
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STRAND PROPERTIES Strand properties The strand used for post tensioning tendons are comprised of 7 wires low relaxation steel The most common diameters used in Australia are 0 5 12 7mm and 0 6 15 2mm The following table gives the main
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Post Tensioning Tendon Type Prestress Loss PSI Slabs Beams amp Joints Stress Relieved 270K Strand 30 000 35 000 Low Relaxation 270K Strand 15 000 20 000 Bars 20 000 25 000 The diagram on this slide illustrates the impact of friction and wedge set i e
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Post tensioning is an operation carried out on site which consists in putting strands in tension after the concrete has been poured and has reached a minimum compressive strength The fresh concrete is poured in place in a formwork including reinforcement where specially designed ducts and anchors are installed embedded in concrete
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There are two types of Post tensioning method The first one is Unbonded post tensioning The tendon of this type consists of a plastic tube steel strands coated a grease This type allows for installing tendons individually And also this type is able to avoid