Abstract
As for today, post-tensioned slabs gained much popularity and started to be widely used among construction companies all around the world. As we refer to the structural members, we acknowledge that the price of the slab is much higher in comparison to the other structural members like columns, beams, or foundation in accordance to the amount of steel and concrete in it. A comparative study has been done between post-tensioned, and reinforced concrete flat slab to compare how much each slab cost. It describes that since the post-tension slabs are thinner and it provides fewer columns, so the amount of concrete required is less than the required amount in a flat slab. Special steel tendons that are used in post-tensioned slabs will be stretched by a hydraulic jack after the casting of concrete, and these tendons have an effect in reducing the reinforcement steel bars. Although tendons are used only in post-tension slabs, the amount of steel used in it is less compared to flat slabs. Furthermore, the contractor work cost differs from doing the post-tensioned slab and flat slab. The study had been done by comparing the amount of concrete, steel and contractor work cost. The results obtained from the comparative study between post-tension slabs and reinforcement concrete flat slabs indicate that post-tensioned slabs are cheaper.
Highlights
There are many different types of slabs that used in structural buildings, for example, flat slab, hollow block slab, solid slabs, bubble deck slab, composite slabs, waffle slabs, dome slab, precast slabs and post-tensioned slabs
The aim of the study is to show the post-tensioned is more economical than the reinforced concrete flat slabs according to the amount of steel, concrete, tendons and the contractor cost
The quantity of concrete in the columns and slab of flat slab 186.3 m3 which is more than in the posttensioned slab which is 152.55 m3 and that the cost of concrete in post-tensioned is more expensive than in flat slab, after multiplying the total volume by the cost of concrete it showed that the post-tensioned slab is more economical than the flat slab
Summary
There are many different types of slabs that used in structural buildings, for example, flat slab, hollow block slab, solid slabs, bubble deck slab, composite slabs, waffle slabs, dome slab, precast slabs and post-tensioned slabs. Each type of slab has advantages and disadvantages and each type has a case to be used according to the needs of a project. In certain structures such as cinemas, schools, university halls, parking places, airports, shopping malls or bridges, it is not preferable to place a column in the middle of these structures and at least there should be a long distance between the columns. The cost should be taken into consideration while choosing the type of slab. The cost should be taken into consideration while choosing the type of slab. (Park & Gamble, 1999)
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