Abstract:
The world is changing; the economy is changing; and Architectural practice is
changing. Therefore, there is a definite trend towards the irregular shapes with large spans
in buildings due to the fact that there is now more emphasis on providing large
uninterrupted floor space which can result in higher rental returns. Today the building
industry is taking the next step in concrete technologies by introducing post-tension
systems to slab construction with the use of system formwork and high strength concrete.
Post-tensioned concrete has proven to be a preferred method of construction for
commercial and office buildings, residential apartments, high-rise condominiums, parking
structures, and mixed-use facilities such as hotels and entertainments. The main benefits
over conventionally reinforced concrete being its ability to span greater distances without
resorting to thick slabs and beams (and the consequent loss of head height), reduce
deflection and cracking, Reduction in overall building mass, which is important in zones of
high seismicity and superior performance of diaphragm action at building irregularities.
There are also some associated labour and time savings. The objective of this paper is to
introduce the post tension slab system to Sri Lankan construction industry. This study will
discuss the benefits of having post tension in building industry, challengers encounter in
PT designs and quality controlling process during construction
