May. 06, 2024
Hardware
Since the 1950s, post-tensioning concrete has grown in popularity. Whether you’re trying to streamline the building process, reduce costs or give a structure the best chance of surviving weather hazards, there are numerous benefits of post-tension slabs.
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Here’s a look at some hidden advantages of post-tensioning concrete and why you should consider these methods for new structures.
Post-tensioning concrete is the process of adding steel bars (tendons) below a mixture’s surface. Once the concrete fully cures, tension is applied to the steel bars. These reinforcements introduce stress to the concrete, which can prevent cracks and shifting down the road.
Construction teams rely on post-tensioning methods to help concrete reach its strongest state. This process is efficient for creating surfaces that can withstand the loads required for a newly developed structure.
Consider these surprising advantages of post-tensioning.
Prestressed concrete supports larger loads compared to traditional pouring. Using post-tension methods means concrete substrates are thinner, sometimes by as much as 20%.
When a building is complete, the total height of the structure is shorter than constructing slabs without post-tension reinforcements. Smaller buildings call for teams to use less cladding, concrete, cement and shear. Extra materials can be used for future projects or returned to the manufacturer to increase your bottom line. Either way, you’ll save on costs and materials.
When you rely on post-tensioning concrete methods, fewer materials are involved in the final structure. This includes the amount of cement used to create concrete mixtures — a significant source of carbon emissions.
It’s possible the timeline for a building project will be shorter with post-tensioning concrete, which lessens the amount of time gas-powered tools and vehicles run from the start of the assignment through completion.
The setup for post-tension procedures can be done quickly without the variables of traditional curing. The fact that crews spend less time laying steel supports means teams will be ready to pour mixtures and let the concrete dry on an impressive timeline. Your post-tension building project can progress consistently.
Post-tensioning results in compressive stress in concrete, which helps to reduce the effects of shrinkage and temperature changes that can cause cracking. The post-tensioning system consists of steel strands that are tensioned after the concrete has hardened, creating internal forces that resist external loads.
Post-tensioning systems are effective for crack control because the tendons act as reinforcement for the concrete and prevent it from splitting apart. The tendons are anchored at both ends of the concrete member and are usually placed in ducts or sleeves to allow them to move freely during tensioning.
Related links:Contact us to discuss your requirements of post tensioning system supplier. Our experienced sales team can help you identify the options that best suit your needs.
The tendons are tensioned by hydraulic jacks and then locked in place by wedges or nuts at the anchorages. The tension in the tendons induces a compressive stress in the concrete, which counteracts the tensile stress caused by shrinkage or bending. This way, the concrete remains relatively crack-free and watertight throughout its service life.
Many property owners building post-tension structures find surfaces do a fantastic job of limiting unwanted vibration and sag. Inside the poured concrete, cables help to balance the load.
Rather than the center of slabs being put under immense stress where they can crack, the internal cables take care of the heavy lifting. Over time, concrete maintains its shape and refrains from dipping downward when objects are placed on top of it.
STRUCTURAL TECHNOLOGIES provides VSL post-tensioning products as well as construction systems in the United States. Whether you want to build or repair a commercial building, parking lot or similar structure, we will assist with design, installation and material fabrication for unbonded monostrand post-tension systems, bonded multistrand post-tension systems, shear reinforcements, barrier cables and lockable dowels.
We specialize in external and internal post-tensioning technology. STRUCTURAL TECHNOLOGIES provides you with solutions for installations outside a structural element — within grouted ducts — or within an existing member — via core drilling — to handle the scope of your project.
To learn more about post-tensioning products and our service capabilities, submit a contact form with STRUCTURAL TECHNOLOGIES.
There are many benefits in using post-tensioned (PT) concrete slabs:
One of the most significant is that the depth of the floor system is unmatched by any other available structural floor system. 8-inch-deep flat plate PT slab can meet design demand and deflection criteria for most residential or commercial projects. If well planned and documented during construction PT slab can be a valuable asset for landlords as it allows for great floor plan flexibility and easy change in occupancy.
In addition to the above benefits, well designed and detailed PT slab makes a very robust and strong structure for resisting both gravity and lateral loads (wind, seismic). A multi-story building utilizing flat-plate PT slabs for the floor system can be as much as 25-30% lighter compared to conventionally reinforced concrete flat-slabs, thus reducing the cost for foundations.
One of the most important elements in designing and detailing PT slabs is the slab-to-column joint. Failure in such a joint can lead to significant structural damage and even progressive collapse. Therefore, the attention to these connections is of extreme importance. A well-done design must be matched with well-done installation and construction. One little trick we employ in our design is to request for a bright colored sheathing for the PT tendons on our projects. Most PT suppliers will not charge any premium for such a simple request. This makes the inspection and quality control (both internal and outside) much easier.
Combining this with drone photography of the slabs before they are cast, is an invaluable record for the Owner on a project. We have successfully drilled through already cast slabs based on taken drone photos during construction. Having the cables easily distinguished is priceless. The photos we share are examples of perfectly constructed column-to-slab joints for some of Fine Tuned Structures’ projects.
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