Review: Design of Post Tensioned Slab

Abstract

Concrete is one of the most common building materials in civil engineering, due to its simple production, high compressive strength and versatility in form and application. However, concrete is a brittle material with a relatively low tensile strength, making it subjected to cracking. These problems are generally overcome by using reinforcement of various types; the most common is using regular reinforcement bars to carry tensile stresses where it is needed. Research has shown that labour on the construction site, such as preparation of formwork, placing of reinforcement bars and finishing of the concrete, can provide costs of the same magnitude as the material costs. Therefore, it is desirable to investigate new technologies that can contribute to saving labour time during construction and provide a more efficient solution. MAJOR HEADINGS 

- Good crack behavior and therefore permanent protection of the steel against corrosion.

- Almost unchanged serviceability even after considerable overload, since temporary cracks close again after the overload has disappeared.

- High fatigue strength, since the amplitude of the stress changes in the prestressing steel under alternating loads are quite small.