**1. Prestressed Concrete Concepts:** – Prestressed concrete strengthens against tensile forces – Tensioning of high-strength tendons improves performance – Characteristics of high-strength concrete and steel – Internal stresses are introduced in a planned manner – Used in high-rise buildings, bridges, and industrial structures **2. Pre-tensioned Concrete Concepts:** – Tendons are tensioned before concrete casting – Strong end-anchorage points are required – Bond strength between concrete and tendons is critical – Tendons generally form straight lines between anchorages – Used for structural beams, floor slabs, and water tanks **3. Post-tensioned Concrete Concepts:** – Tendons are tensioned after concrete casting – Tendons are encapsulated within protective sleeves – Large forces are required to tension the tendons – Different anchorage systems are used based on tendon composition – Tendon encapsulation systems are made from plastic or steel **4. Bonded and Unbonded Post-tensioning Concepts:** – Bonded Post-tensioning: – Tendons are permanently bonded to surrounding concrete – Grouting protects tendons against corrosion – Bundling of elements inside a single tendon duct is common – Improves structural behaviors of the final concrete structure – Used for efficient tendon installation and grouting processes – Unbonded Post-tensioning: – Tendons are not bonded to surrounding concrete – Tendons are encapsulated within a greased sheath – Reaction forces from tendon profiling counter loadings – Ducts/sleeves can be profiled to any desired shape – Beneficial for countering loadings applied to the structure **5. Applications and Notable Structures:** – Applications of Prestressed Concrete: – Versatile in construction with high-strength steel and modern concrete – Used in major design codes for various structures like buildings, bridges, dams, and pavements – Utilized in stadiums, silos, tanks, and other civil structures – Notable Structures: – Examples include the Sydney Opera House, CN Tower, and the Gateway Bridge – Also used in the construction of LNG tanks, nuclear reactor vessels, and blast-containment walls – Various organizations worldwide promote best practices in prestressed concrete design and construction This organization groups similar concepts together for a more structured and comprehensive understanding of prestressed concrete technology and its applications.https://en.wikipedia.org/wiki/Prestressed_concrete