Prestressed Concrete Terms
Prestressed concrete is a type of concrete that has undergone a process to increase its natural strength. Concrete is threaded with tensioned rods, which inhibit the sagging of the concrete. Prestressed concrete is used as the main material in high rise building flooring, containment vessels of nuclear reactors, long bridges and parking structures. Here are a few terms commonly associated with presressed concrete.
Concrete: A construction material containing crushed stone, sand or gravel, cement, water and limestone. Concrete is often reinforced with steel rods or steel, glass or plastic fibers.
Aggregate: A composite of sand, gravel, or crushed stone used as a base for concrete. Aggregates can also be recycled materials from demolition. Crushed glass, quartzite, or river stones are also used for decorative landscaping purposes.
Bonded Post Tensioned Concrete: Concrete that has been processed through application of compression after having been poured and cured. The concrete is then cast around a curved duct, after which steel tendons or rods are woven through the ducts. The tendons are stretched with hydraulic jacks, and once hardened, the concrete is able to withstand stress and contraction.
Cement: A component in concrete, cement is a substance that can harden independently and bind materials together.
Tensile Strength: A material's ability to withstand the stress from being stretched.
Compressive Strength: A material's ability to withstand the stress of being compressed or crushed.
Rebar: A reinforcing bar, also known as reinforcing steel, that is used as a tension device in reinforced concrete structures.
Tendon: Any tension withstanding material that holds a structure together.