Post-tensioned slabs-on-ground provide a cost-efficient,
high-performance solution for problems associated with ground-supported
residential foundations on shrink-swell soils. The compressive stresses
resist the anticipated tension stresses induced by the soil movements,
enhancing the performance over a non-prestressed foundation. Cost
benefits are achieved by reductions in quantities of concrete, steel
and excavations, which in turn reduce labor costs.
In less expansive soils, a uniform thickness foundation is utilized.
Typical thickness ranges from 7.5- to 12-inches and any increases in
material quantities are compensated by reductions in labor and
equipment costs. With the elimination of stiffening ribs, a
post-tensioned foundation can be constructed rapidly
eliminating labor and equipment to dig the ribs and dispose of
excavations. This is a substantial benefit in sandy soils where
trenches require shoring. Post-tensioned foundations are also used in
areas with stable soils to reduce cracking, reduce or eliminate control
joints, increase flexural capacity and improve constructability.
the control joints also improves the serviceability and eliminates