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advantages of post-tension
Posted by Trent on March 2nd, 2004 09:18 PM
In reply to Post tension slab by Ron on January 19th, 2003 09:33 AM [Go to top of thread]
Post-tensioned slabs cost less, because they are more efficient at minimizing the effects of soil movement. The manage the long-term effects of edgelift when the ground is saturated with water, and edge-drop when the ground is dry around the slab.
A rebar slab can work as well as a post-tensioned slab, but to make one that will work as well ... you will have to spend alot more money on steel and concrete without cables, then with post-tension cables. Thus, it saves money on active soils, and in climates that experience drought and flooding conditions.
The tendons/cables compress the slab, making the concrete stronger. Cables work even when the slab is not flexing. Rebar does not do anything to help UNTIL the slab is flexing. Rebar will get weaker over time. Cables will not grow weaker. Rebar bonds with concrete, and relies upon the strength of the bond to work. Cables do not bond with the concrete at all.
Cracks will occur more often on post-tensioned slabs before the cables are stressed, but once they are stressed, the cracks will greatly deminish.
During stressing, 90% of the tendons load capacity is reached by the hydrolic pump. The anchorage is designed to fracture after the stressing operation. You will never need to re-tension the cables, and if you tried, it could result in a cable that ceases to function.
Cables can be fixed. I have seen cables over 100 feet long removed and replaced if damaged by the plumber or something like that. There are no repairs that cannot be done on cables.
If you have additional questions, consider this website for information:
http://slabotage.textamerica.com
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