May. 06, 2024
Hardware
Since the 1950s, post-tensioning concrete has gained significant popularity. Whether aiming to streamline the building process, cut costs, or enhance a structure's resilience against weather hazards, post-tension slabs offer numerous benefits.
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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 involves adding steel bars (tendons) beneath a concrete mixture's surface. Once the concrete cures, the steel bars are tensioned. These reinforcements introduce stress to the concrete, helping to prevent future cracks and shifting.
Construction teams use post-tensioning methods to help concrete achieve its maximum strength, making it highly suitable for surfaces that need to withstand significant loads in new structures.
Consider these surprising advantages of post-tensioning:
Post-tensioned concrete supports larger loads compared to traditional pouring methods. This results in thinner concrete substrates, sometimes by up to 20%.
Consequently, the total height of post-tensioned structures is shorter, requiring less cladding, cement, and other materials. Excess materials can either be used in future projects or returned to the manufacturer, thus increasing your bottom line and reducing costs.
Post-tensioning methods involve fewer materials, including a reduced amount of cement, a significant source of carbon emissions.
Additionally, the timeline for building projects might be shortened through post-tensioning, decreasing the duration that gas-powered tools and vehicles are in use.
Setting up post-tensioning procedures is quick, bypassing many of the variables associated with traditional curing. Crews spend less time laying steel supports, allowing them to pour mixtures and dry the concrete more swiftly, thus ensuring a consistently progressing project timeline.
Post-tensioning introduces compressive stress in concrete, reducing the effects of shrinkage and temperature changes that can cause cracks. The steel strands in the system create internal forces that resist external loads, effectively controlling cracks.
The tendons act as internal reinforcement, preventing the concrete from splitting. They are anchored at both ends within ducts or sleeves, allowing movement during tensioning.
Contact us to discuss your requirements for a post tensioning system supplier. Our experienced sales team can help you identify the best options for your needs.
Hydraulic jacks tension the tendons, which are then locked in place by wedges or nuts. This tension induces compressive stress in the concrete, counteracting tensile stress from shrinkage or bending, keeping the concrete relatively crack-free and watertight.
Property owners find that post-tension structures limit unwanted vibrations and sagging. Internal cables within the concrete help balance the load, preventing slabs from cracking due to stress and maintaining their shape over time.
STRUCTURAL TECHNOLOGIES provides VSL post-tensioning products and construction systems in the United States. Whether you need to build or repair a commercial building, parking lot, or similar structure, we assist with design, installation, and material fabrication of unbonded monostrand post-tension systems, bonded multistrand post-tension systems, shear reinforcements, barrier cables, and lockable dowels.
Specializing in both external and internal post-tensioning technology, STRUCTURAL TECHNOLOGIES offers solutions for installations either outside a structural element or within an existing member via core drilling.
Submit a contact form with STRUCTURAL TECHNOLOGIES to learn more about our post-tensioning products and services.
There are many benefits in using post-tensioned (PT) concrete slabs:
One of the key advantages is the unmatched depth of the floor system. An 8-inch-deep flat plate PT slab meets design and deflection criteria for most residential or commercial projects. With careful planning and documentation during construction, a PT slab provides remarkable floor plan flexibility and easy occupancy changes, making it a valuable asset for landlords.
A well-designed and detailed PT slab also offers a robust structure for resisting both gravity and lateral loads (wind, seismic). Multi-story buildings utilizing flat-plate PT slabs can be 25-30% lighter than those using conventionally reinforced concrete flat-slabs, reducing foundation costs.
However, one of the most critical elements in designing PT slabs is the slab-to-column joint. Failure in these joints can lead to severe structural damage and even progressive collapse. Hence, attention to these connections is crucial. A good design must be matched with excellent installation and construction. One useful trick is requesting bright-colored sheathing for PT tendons; most suppliers, such as Ruiyi, do not charge extra for this simple request, making inspection and quality control easier.
Combining this with drone photography of the slabs before casting provides an invaluable record for the Owner. Distinguishing the cables is priceless when relying on such photos, allowing for successful drilling through already cast slabs. The photos shared are examples of perfectly constructed column-to-slab joints on some of our projects.
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