What Is Post-Tensioned Concrete?
Post-tensioned concrete uses high-strength steel cables tensioned after the concrete cures to create a stronger, thinner slab. It's standard for commercial floors, parking structures, and residential foundations in expansive soil areas.
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How it works
Steel tendons (cables) are placed in the formwork before the concrete pour, draped in a specific profile. After the concrete reaches sufficient strength (typically 3-7 days), the tendons are tensioned with hydraulic jacks and anchored. This puts the concrete in compression, which counteracts the tension forces from loads.
Advantages
Thinner slabs for the same span (saving concrete and reducing building height), longer spans without intermediate supports, better crack control, and reduced deflection. For foundations on expansive clay, post-tensioning resists the soil movement that cracks conventional slabs.
Critical considerations
Tendon placement must match the engineering drawings exactly — misplaced tendons don't work correctly. The stressing operation requires certified technicians. And future penetrations (core drilling for plumbing or electrical) can be catastrophic if they cut a tendon. Always review PT drawings before drilling any post-tensioned slab.
The bottom line
Post-tensioning creates stronger, thinner concrete slabs. Critical for expansive soils and long spans, but tendon locations must be respected forever.
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