When was post tension concrete used?

1950
The technology was introduced to the United States in 1950 in the Walnut Lane Bridge in Philadelphia, PA. Post-tensioning is now used extensively in bridges, elevated slabs (parking structures and residential or commercial buildings), residential foundations, walls, and columns.

What year did post tension slabs start?

When was post-tensioned concrete first seen in this country? The first use was on the Walnut Lane Bridge in Philadelphia in 1949.

Where is Post-tensioning usually carried out?

Unlike pre-tensioning, which can only be done at a precast manufacturing facility, post-tensioning is performed on the jobsite in cast-in-place applications. The concrete component is cast with steel reinforcing strands installed in a way that protects them from bonding with the concrete.

What are the disadvantages of Post-tensioning?

Disadvantages

• Since many tendons or steel cables are used in a Post-tensioned structure, there are high chances of corrosion,
• Skilled labour is required.
• If the post-tensioned structure is not laid as per the standards, it may cause accidents due to poor workmanship.

How do you know if a building has post tension?

How to tell if you have a post tension slab. Most homes that have post tension slabs have a sign that is stamped into a concrete garage floor, often near the edge of the garage door right in plain sight. Older homes with post tension slabs may have a plastic or paper sign fastened to the wall.

How long do post tension buildings last?

about 15-20 years
Conventional concrete & rebar foundations last about 20-30 years before failure begins to occur. Post-tension slabs are lasting about 15-20 years and are failing at a much higher rate. Post-tension slabs are created with concrete trenches around the perimeter of the house where the external walls will be placed.

How long will a post tension slab last?

How can I tell if I have a post tension slab?

Where is post-tensioning concrete used?

Post-tensioning now is used extensively in bridges, elevated slabs (parking structures and residential or commercial buildings), residential foundations, walls, and columns. Jim Rogers Bending and flexing creates high tensile forces that can cause the concrete floor slab to crack.

How do you know if you have a post tension slab?

Is rebar better than post tension?

Post tension foundations are what tract home and apartment builders use so therefore they are lower quality. Post tension foundations don’t work for our soils. Rebar works better here. Those post tension cables can break one day and go flying out and might kill someone.