Cost savings: Post-tension concrete requires thinner concrete members, plus has lower requirements for rebar, building cladding, service elements and shear walls. Is a post tension slab better? endobj Now, the clay soils in Southern California and Arizona are nothing in comparison to the clay soils in the Midwest (and more so the Texas region of the United States). . Bridges. Post-Tension Slab Services From residential new construction, multifamily Post-Tension Projects, commercial multistory flat plate designs, parking garages, and podiums to Post-Tension Materials, stud rails, barrier cable, and Post-Tension Repair, Post-Tension Services of Texas would enjoy the opportunity to add strength to your next project. They are placed in the slab before the . Post-tensioning of concrete slab methodology Handling and Storage of Materials for Post Tensioning Activity Pre-stressing strands need to be free of grease and corrosion-enhancing materials. An experienced post-tensioning engineer will probably be able to generate larger capacities depending on concrete strength and force applied from the tendons. endstream Revolutionary system designs by GTI are rigorously tested, to guarantee they meet and exceed mechanical and performance requirements while delivering the highest levels of long term durability.. <> Tendon elongation during stressing (D) is typically considered to be 0.081 inches per foot of concrete. Our unbonded systems feature 0.5" and 0.6" diameter strands coated with a layer of . Steel strand (12.7mm typically) is pushed through the duct (known as tendons) and . Bonded Slab Post-Tensioning Systems. Responsibilities include: Provide installation shop drawings and calcs that meet requirement in structural design drawings. Registration on or use of this site constitutes acceptance of our Privacy Policy. Benefits Fire resistance Cost Speed Reduced material use Economics of the post-tensioning slab system are discussed including relative material contents, speed of construction, and factors affecting the cost of post-tensioning. D. Local Building Code. Post-tensioned concrete uses tendons (usually -inch (12 mm) tempered steel cables with 270,000 pounds per square inch (psi) tensile strength) in addition to rebar to give it strength. RE: Post-Tension Slab-on-ground Specifications? With a variety of systems available, we can help select the right system to meet your projects specifications. endobj This is why they are used in commercial foundations so frequently. Specification Limits on Slab-on-Grade Placement Size. The. endobj This value is used throughout the post-tensioning industry when calculating actual number of tendons required during shop drawing creation. A post-tensioned or rebar reinforced concrete slab can be designed. 2 0 obj endobj 1.2.1 Initial Service LoadCombination Reasons such as off-topic . <> This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. A post tension slab is a type of pre-stress concrete. The post-tensioning technique involves installing and tensioning tendons in a concrete element, thereby applying compressive stress to the material. endobj https://www.buildshownetwork.comhttps://www.instagram.com/thebuildshow endobj Our Future | Vision PTI envisions a future in which post-tensioning is the first choice for reinforcing all structures. Forms integrated concrete beams running throughout the footprint and perimeter. a#32M. The buildings can be designed with longer span which make its space look more clear. All GTI systems enable easy maintenance and the ability to replace and re-tension cables when necessary. Close this window and log in. Its more than just forms and pouring concrete! Post-tensioned concrete is a type of prestressed concrete that is subjected to compressive stress after the pouring and setting of the fresh concrete mix, that is, when the concrete is in its early stages of hardening and developing its characteristic resistance. <>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> GTI designs and supplies the most advanced and reliable Reusable Pre-Tensioning System in todays market. Post tensioning is a technique for reinforcing concrete. The thinner slabs could also make room for extra . The function of post-tensioning is to place the concrete structure under compression in those regions where load causes tensile stress. 2022 GTI - General Technologies, Inc. All Rights Reserved. *Eng-Tips's functionality depends on members receiving e-mail. First off, one could argue that post-tensioning is superior to conventionally reinforced concrete in a pure engineering sense. Please let us know here why this post is inappropriate. 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. Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. A post-tensioning tendon is made up of one or more pieces of prestressing steel, coated with a protective coating, and housed inside a duct or sheathing. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. Have own set of current approved drawings (Structural, Post-Tensioning tendon placement drawings & Rebar placement drawings) Thats a short explanation of how Post-Tension cables are installed and what they are. The Concrete Centre regularly contacts registered users with email newsletters, event invitations and updates on new guidance. Concrete slabs can be described in terms of flatness and levelness. Flatness can be thought of as smoothness how bumpy or smooth the slab is. Post-tensioned slabs. Post-tensioning is a method of reinforcing (strengthening) concrete or other materials with high-strength steel strands or bars, typically referred to as tendons. Login. I am looking for a specification for Post-Tension Slabs-on-graond. Post-tensioned slabs are a special kind of concrete slab, often used in areas where there is a need for thinner slabs and/or with greater space between columns, or even in a column-free space. 1a. Promoting, selling, recruiting, coursework and thesis posting is forbidden. They indicate the end of the post tension cables. Next, since we want this slab to be extra strong, we use a type of concrete reinforcement called post-tension concrete, instead of the traditional rebar concrete reinforcement. Post-tensioned (PT) slabs are typically flat slabs, band beam and slabs or ribbed slabs. Figure 1. The steel cables are usually wrapped in a plastic coating and run both directions in the slab. 11 0 obj The system is available for both 0.5 and 0.6 tendon diameters and can provide a critical level of durability for your structure. endobj - Fast construction Because of reduced rebar, it allows you to save considerable time that is otherwise taken up by the rebar fixing. Care should be taken in handling the strands in order to avoid mechanical damage to the strands. Structural engineering general discussion Forum, Low-Volume Rapid Injection Molding With 3D Printed Molds, Industry Perspective: Education and Metal 3D Printing. Post-tensioned slabs use high-strength tensioned steel strands to compress the slabs, keeping the majority of the concrete in compression. y;~x8!CdZ!_gM|>oOUm[-ax[Yu7P?Eiy _P>A5P3/Z BObT.b gG0N1Rxz wL$%h& 4 0 obj The prestressing steel applied corresponds to international standards EURONORM 138-79, ASTM A 416-85, BS 5896. Post-tensioning is a method of applying compression after pouring concrete. Thanks. Unbonded post-tensioning offers the benefits of rapid installation and using less reinforcing steel to achieve longer and thinner slabs with the same strength as other methods of construction. The system uses up to ve strands in at-shaped ducting and anchorages. Use Template. A well-designed post tension slab can withstand lateral loads without cracking or buckling. <> <> The GTI Zero Void Bonded Monostrand System is the premier corrosion protection system available for single strand tendons. The idea is that this type of foundation spreads the weight of the home over a larger area. Post-tensioned slabs are extremely durable and long lasting, resist cracking, have no intervening joints, and also have better surface uniformity and predictability of play. The name Post-Tension comes from the fact that this cable is stressed with tension forces, after (post) a concrete structure has been poured, and has cured for a few days (exact wait time to begin to tension the cables depends on the concrete structures specs). The area within the foundation walls has to be free of vegetation, top soil or other . The name "Post-Tension" comes from the fact that this cable is stressed with tension forces, after ("post") a concrete structure has been poured, and has cured for a few days (exact wait time to begin to tension the cables depends on the concrete structures' specs). Typical thickness ranges from 7.5- to 12-inches and any increases in material quantities are compensated by reductions in labor and equipment costs. GTI is the industry leading manufacturer of state of the art, high performing and reliable post-tensioning systems. The total weight is less than reinforced concrete (RC slab). This prevents the cables from touching the concrete. A post tension slab is reinforced with stranded steel cables that are tensioned (tightened) after the concrete hardens. The way Post-Tension cables are installed is as follows. Much like the systems used on bridges, the system incorporates a monolithic concrete slab with cables that are tensioned after the concrete has cured to a certain compressive strength. Then, after the foundation is poured, the cables are hydraulically tightened to required pressures to secure the foundation into . That's because the slab can carry more weight on either side of the beam if it is anchored to a pillar. No flame cutting of the strands is permitted. Can anyone help me find one on-line. Mainly used for single-hole tensioning.It can also be used for porous preloading, tensioning, and troubleshooting, and can be applied to high-strength steel wire bundles and steel strands of . The slab has to be at least 3.5 thick and possibly thicker for expansive or other difficult soils. Pre-pour checklist per specifications . Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. stream 8. 3.3 Post-Tension Supplier 21 Must ship material from a PTI Certified Plant. Rebar reinforcement in this case is technically allowed by code but in our experience, a properly designed post-tensioned concrete slab will minimize cracking due to shrinkage. Here's How Post Tensioned Foundations Work: First, high-grade steel cables in poly sleeves, called post tension cables, are placed in a grid pattern according to precisely engineered specifications inside the slab. 3. Anonymous User . Why Choose Advanced Post-Tension? <> GTI provides bonded post-tensioning systems and components worldwide. u{^3cFX:[**&8jt.bJE{kR%1jNTy3tXDU[lhDm Prestressed Post Tension Mono Strand Stressing Jack for Bridge Description of Post Tension Mono Strand Stressing Jack It is a multi-purpose prestressed tensioning equipment, which is easy to operate. Afterwards, once the concrete has gained strength but before the service loads are applied, the cables are pulled tight, or tensioned, and anchored against the outer edges of the concrete. Post-tensioning is intended to eliminate the use of steel rebars by achieving a minimum of 50 psi compression of the concrete at the middle of the slab. Post-tensioning applies a compressive stress on the material, which offsets the tensile stress the concrete might face under loading. %PDF-1.5 Copyright 1998-2022 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission. 1 0 obj @8jIC2Rp#7sTU}}Yr'Hv~6XVq1e;??{q:3N3. Post tensioned slabs are designed to "float" on clay, soils with low load-bearing capacity. Adding reinforced rebar grids inside a concrete slab is a good way to keep concrete from cracking. Source: construblogspain.files.wordpress.com/2013/09/dsc03059-large.jpg?w=940&h=704 Thin slab bonded anchorages (2 - 4 strands) Bonded multistrand anchorages (4+ strands) Strand Systems STRUCTURAL TECHNOLOGIES provides high strength (270 ksi) strand to repair any type of post-tensioning system, including: Sheathed strand Bare strand VStrand Heat Resistive Tendons Bonded PT Duct & Grouting Systems Adding geotextile also is a super-strong mesh that keeps this process on a smaller scale likewise. The prestressing steel is manufactured as per the requirements of ASTM A-416 and typical strand sizes are 0.50 and 0.60 inch in diameter. Similarly, they also allow for greater building height, and more efficient space usage. 10 0 obj Design of PT Slabs on Compressible Soil Ground Based on Specification of PTI. endobj 1. 9. The default load combinations for post- tensioning are defined in the following sections. Post-tensioned slabs use high-strength tensioned steel strands to compress the slabs, keeping the majority of the concrete in compression. This is where post-tensioning comes in. Adaptable to a variety of structures, unbonded monostrand can be easily, rapidly, and economically installed. Steel tendons used in Post Tensioning of Slab. Audit. l5+XR2Gf! 65D& A residential post-tensioned concrete slab will typically be 8 inches thick and use 3000 psi concrete. With a variety of systems available, we can help select the right system to meet your project's specifications. Click Here to join Eng-Tips and talk with other members! KN@g:{jXlR]OPa:I Already a Member? Featuring the same benefits as bonded multistrand post-tensioning, our bonded slab systems utilize flat ducts to maximize eccentricity of the prestressing and to reinforce slabs as thin as 5. Punching shear is a failure mode where a column breaks through the slab like a punch through a piece of steel or leather, and is a function of slab . 8 0 obj First we grade and apply proper sub-grades to the surface where the slab will be built on. :tY0DY?K"flEQ@ f}GhewFss{@IJZEK**WD?FJ*4\(fUG6b9sT2\Opnn%2LLJeJ&zg/Cb.51dDY!Txh\mOG 7 0 obj What is a Post Tension Slab. Lets use a foundation slab as an example if a use case for post-tension cables. Certify calibrated stressing equipment. What post-tensioned slabs do is add a certain amount of internal tension that holds the slab in place continually. Construction > Unbonded post-tensioned slab pre-pour inspection checklist. A post tension slab is a reinforced concrete structure that is designed to resist lateral forces. Applications for monostrand systems include elevated slabs, slab-on-grade, beams and transfer girders, joists, shear walls and mat foundations. Galvanised duct which is profiled using bar chairs follows the area where otherwise tension would occur in the concrete element. For aggressive environments components can be supplied Zinc-plated or with encapsulation. Post-tensioned concrete slabs are typically expected to crack less than other slabs because post-tensioning produces compressive stress that must be exceeded before enough tensile stress develops to cause cracking. Red Flag This Post. These are ideal for waterproofing and flexibility in flooring. Below are some specs about the post-tension cables that we use for our sport courts: 2500 PSI (Use with 3000 PSI minimum concrete), Type of Court (Pickleball, Tennis, Basketball, etc), 2022 Precision Courts LLC | Built by Tech Recon | Cookie Policy (US), Post-Tension Concrete Athletic Court Slab. endobj 0. It is a concrete slab that has steel cables running through it that have been put under lots of stress to reduce cracking of the concrete and increases the strength of the slab. Post-tension cables are steel, flexible cables made from several strands of steel wire intertwined with each other in order to form a thicker steel wire which we call the Post-Tension cable. Levelness, on the other hand, is the average change in elevation over a longer distance, for example, inch in 12 feet. Post-Tension Slab-on-ground Specifications? The entire duct is subsequently fully lled with cement grout injected under xMk09}J!MziMJ_v\I5TK77pgwqg2 The photo below shows a typical elevated concrete slab layout after we finish scanning. Post-tensioned slabs have many advantages over reinforced concrete slabs and other structural systems for both single and multi-level structures. That's why post-tensioned slabs are an initial investment worth it in the long run. A post-tensioning tendon is made up of one or more pieces of prestressing steel, coated with a protective coating, and housed inside a duct or sheathing. 1.5 SYSTEM DESCRIPTION A. Unbonded post-tensioning system described herein is intended to perform without long-term corrosion or other distress in an aggressive environment as defined in the Specification for Unbonded SingleStrand Tendons. Metal 3D printing has rapidly emerged as a key technology in modern design and manufacturing, so its critical educational institutions include it in their curricula to avoid leaving students at a disadvantage as they enter the workforce. <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 12 0 R/Group<>/Tabs/S/StructParents 1>> Typical interior and exterior footings support a 15,000-to 20,000-pound post load without additional reinforcement. tngv752 (Structural) 27 Sep 04 04:03. We have received your request and will respond promptly. Some benefits include: Longer Spans Overall Structural Cost Reduced Floor to Floor Height Deflection Free Slabs Waterproof Slabs Early Formwork Stripping Reduced Materials Handling Post-tension cables are therefore the next part of the foundation concrete slab that are installed. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. rwXChRT7]5||l[6(|p x# Z/g|* 3!N /oIJB$j$P]+@u_d}tvoM#L} 303C"#DXvT$p"O Mineral Products Association (MPA) is the trade association for aggregates, asphalt, cement, concrete, dimension stone, lime, mortar and silica sand industries. 5 0 obj ; Reduce building height if needed for regulations - The thinner post tension slabs reduce the floor-to-floor height, and this reduces the height of the building. Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. <>>> 3 0 obj Post tension slab is a combination of conventional slab reinforcement and additional protruding high-strength steel tendons, which are consequently subjected. Whereas a regular slab puts most of the weight on footings, a post-tension slab puts some of the weight on the slab itself. <> To Learn more about Post Tension Concrete Slabs in Florida or receive a quote on your project 352 . Applications. Post-tensioning tendons, which are prestressing steel cables inside plastic ducts or sleeves, are positioned in the forms before the concrete is placed. GTI systems are the gold standard for post-tensioning performance and reliability. Once the concrete has gained strength to 2000 psi, typically within the 3 to 10 days recommended by PTI, the tendons are stressed. a+*VSzfc|TqM)TF]_^b_lS=> L^>WF`DG@sI[E54^W`(y1EnOh?4x.[{G}j4:YnbfNCY.A?g}}j\"pRSajg&.,r8vix3oG>kI*mW2=y}-FFPiEeM+yGcHmc}H0KOqyCe0LD>z):F>36p\[TsMMz >}S/n\}7?'}h7,~@Hgp2z_N7\jc? Unbonded Post-Tensioning Unbonded post-tensioning offers the benefits of rapid installation and using less reinforcing steel to achieve longer and thinner slabs with the same strength as other methods of construction. The "squeezing" force is applied by the post-tension cables at their . Fig 3: Steel tendons used in Post Tensioning of Slab. With a focus on continued quality advancements, GTI has consistently improved our components and systems over the years to fit the unique demands of customer projects. The post-tension cables are put down on the inside of the concrete formed-area. PT slabs offer the thinnest slab type, as concrete is worked to its strengths, mostly being kept in compression. <> Post- -tensioning strand, couplers, Post tension slab is a combination of conventional slab reinforcement and additional protruding high-strength steel tendons, which are consequently subjected to tension after the concrete has set. Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a parts function at the center of their design considerations. The purpose of a post-tension slab is to reduce building costs in areas with expansive or otherwise poor soil conditions. The GTI Reusable Pre-Tensioning System is a proven method of providing reusable anchoring devices for a variety of construction applications including: precast plants, ground anchor and tie-back systems, heavy lifting, and post-tensioning. The cables are slid inside a plastic sheathing, like a wrapping. The post-tension slab is a combination of traditional slab reinforcement and additional high-strength steel tendons that are subject to stress after the setting of concrete. One engineering challenge post-tensioned slabs present is a decreased resistance to punching shear. This specification has been prepared on the basis of the ACSE (NSW) Concrete Specification and amended where applicable to suit . Cost Savings. Post Tensioned Concrete courts were developed in 1970's specifically for areas like the South Western U.S. that have poor soil conditions. Our encapsulated systems provide the highest level of corrosion protection and durability for any type of concrete project. Post-Tensioning Components: Cable packages, hardware and accessories Conventional Reinforcement - Rebar: Fabrication and delivery; completed shop drawings; dedicated project management and site visits; beam measurement The Concrete Centre provides material, design and construction guidance. Construction schedules and contractor economics typically require concrete placements of 10,000 to 20,000 square feet or from 30,000 to 50,000 . endobj 6 0 obj x][o6~7GyE(:MEHPaLo;u/IyHQGb4mD~$BNs?nHKE3|~?btny^^7M0SI??CyowW7~{3~{s~v6]s66d5XgIHk32FbWVZz{` Each cable is put down from one end of the slab across to the opposite side. This enables greater design flexibility in buildings and residential structures. A post-tensioning tendon consists of strands, duct, and anchorages. This value comes from D = sL/AE where s = 189 ksi, L = 12 inches, A = 0.153 in 2, and E = 28,000 ksi. Using rebar for shrinkage and temperature reinforcement in parking garage slabs. These circles are usually about 2 to 4 feet apart. "Post-Tensioning Manual". Post-tensioned slabs require less concrete than traditional ones, saving builders money. Here are some pictures of the "muscle and teeth" of PT cables. The materials used to post-tension concrete members are ultra-high-strength steel strands and bars. Post-tensioned slabs are an investment that helps homeowners reduce the risks of concrete contraction and cracks, which inevitably costs money to repair. This gives a very efficient structure which minimises material usages and decreases the economic span range when compared to reinforced concrete. Please let us know here why this post is inappropriate. With the elimination of stiffening ribs, a post-tensioned foundation can be constructed rapidly eliminating labor and equipment to dig the ribs and dispose of excavations. More information on post-tensioning, including example case studies, can be found at the Post-tensioning Association (PTA)website at www.post tensioning.co.uk. The tips of the cables are attached to the forms on each side with special lock-mechanisms. When the concrete has sufficiently cured, the plastic sheathing is stretched. We recommend using PT for temperature and shrinkage reinforcement. This hybridisation helps achieve the formation of a much thinner slab . Theoretically, this compression is accomplished by "squeezing" the slab together from the edges toward the middle. The VSL post-tensioning slab system has been used in many thousands of buildings and other structures throughout Australia. Use Template. Generally pre-cast elements where the strand or bar is stressed before the concrete being poured over it (no ducts used). Our systems are rigorously tested and exceed both static and fatigue requirements. With GPR, we can also pinpoint the depth of every object we locate in concrete with an accuracy of +/- 10-15%. 12 0 obj The benefits of post tension slabs include the following: Greater architectural design freedom - For example, you can have larger spaces without support columns and thinner slabs. Can I Drill into a Post-Tension Slab? Post-tensioning is a method of reinforcing (strengthening) concrete or other materials with high-strength steel strands or bars, typically referred to as tendons. The prestressing steel is manufactured as per the requirements of ASTM A-416 and typical strand sizes are 0.50 and 0.60 inch in diameter. Horizontal applications (such as beams, slabs, bridges, and foundations) typically employ strands. Let try www.structuralsystems.com.au. Structural Design conforms to both International Building Code (IBC) and Post Tension Institute (PTI) specifications. <> This gives a very efficient structure which minimises material usages and decreases the economic span range when compared to reinforced concrete. The courts are built with tension cables placed in both directions as per design engineering specifications within the concrete slab. For post-tensioned concrete design, the user can specify the prestressing load (PT) by providing the tendon profile. Furnish post-tensioning tendons and accessories to meet structural specifications. <> By joining you are opting in to receive e-mail. PT systems provide active reinforcement. stream Specifications of Studs and Rails; Punching Shear Reinforcement. % 0.5 GTI Zero Void Continuous Intermediate, 0.5 GTI Zero Void Bonded Monostrand System, 0.5 GTI Zero Void Bonded Fixed-End Anchorage, 0.5 GTI Zero Void Bonded Intermediate Anchorage, 0.5 GTI Zero Void Bonded Stressing-End Anchorage, 0.5 GTI Zero Void Bonded Stressing-End Metal Ring, 0.5 GTI Zero Void Bonded Stressing-End Threaded Metal Ring, 0.6 GTI Zero Void Bonded Monostrand System, 0.6 GTI Zero Void Bonded Fixed-End Anchorage, 0.6 GTI Zero Void Bonded Intermediate Anchorage, 0.6 GTI Zero Void Bonded Stressing-End Anchorage, 0.6 GTI Zero Void Bonded Stressing-End Metal Ring, 0.6 GTI Zero Void Bonded Stressing-End Threaded Metal Ring, GTI BCS Bare and Encapsulated Barrel Anchors, GTI BCS In-Line Fixed-End Anchorage Group, GTI BCS In-Line Stressing-End Anchorage Group, Extrusions & Coatings of Encapsulated Control Lines.
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