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Case Studies

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. Reducing the control joints also improves the serviceability and eliminates durability problems.





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