What are post-tension cables? How strong are they? Are they the same thing as barrier cable systems? In this article, you will learn the answer to these questions and more.
Post-tension cables are high-strength steel cables placed within a plastic casing and are used in concrete construction to provide added strength to thin or long slabs. The cables are generally tensioned 7-10 days after the concrete is poured.
What is the purpose of post-tension cables?
Post-tension cables are used to place the concrete slab under pressure in regions where load causes tensile stress. Post-tensioning applies compressive stress on the material, which offsets the tensile stress the concrete might face under loading.
The steel cable is made up of a total of seven wires, consisting of six wires braided around a single king-wire. The braiding of the wires helps give added strength to the cable. While post-tension cables use the same seven-wire cable as cable barrier systems, the cables used for barrier cable systems are hot-dip galvanized. Barrier cable systems are typically used to protect pedestrians and vehicles in parking garages and ramps.
How strong are post-tension cables?
The tensile strength of post-tension cables is 270,000 pounds per square inch (psi) and they can handle a stress force of 33,000 pounds. Post-tension cables are more powerful than rebar, which will yield about 60,000 psi.
What are the advantages of using post-tension cables?
Since post-tension cables are so much stronger, they are used in place of rebar for concrete construction that would be otherwise difficult or impossible. Another advantage of using post-tension cables is that it allows fewer beams to be used and the beams and slabs to be continuous.
Additionally, they reduce the weight of the building and lessen the load on the foundation. This is because post-tension cables support thinner slabs which means using less concrete in the construction. Lastly, it also reduces shrinkage cracking in the concrete, allowing fewer joints to be used.
Can a post-tension cable break?
Post-tension cables can break or sustain damage if they are cut into inadvertently. This is why It’s important to have a professional concrete scan done before any concrete restoration or construction is done on the area. Thankfully, there are concrete scanning and professionals that specialize in this. They will provide you with the exact depth and spacing of the post-tension cables.
There are many benefits to using post-tension cables in construction. If you are looking for reliable and experienced post tension services, look no further than Post Tensioning Solutions. Call us today for more information or get started with our services.