What is Post-Tensioned Concrete?
Post-tensioned concrete is a method of reinforcing concrete by pre-stressing it with high-strength steel tendons. This technique allows for longer spans, thinner slabs, and more efficient use of materials compared to traditional reinforced concrete.
How Does It Work?
The process involves casting concrete around plastic or steel ducts that contain unstressed steel tendons. After the concrete has cured and gained sufficient strength, the tendons are stressed using hydraulic jacks, compressing the concrete and creating a pre-stressed structure.
Key Benefits
- Longer Spans: Post-tensioning allows for longer spans without intermediate supports, providing greater design flexibility.
- Thinner Slabs: Structural elements can be made thinner, reducing material costs and building weight.
- Crack Control: The compressive stress helps control cracking, improving durability.
- Faster Construction: Forms can be stripped earlier, accelerating the construction schedule.
Applications
Post-tensioned concrete is widely used in various construction applications including:
- High-rise buildings
- Parking structures
- Bridges and overpasses
- Water tanks and reservoirs
- Industrial floors
