A Resource for Architects, Engineers,   
Builders and Contractors....

Post Tension Design


Design Services
Project Images
Contact Us



1202 N. Monte Vista
Upland, CA 91786

Tel: 909-985-0787
Fax: 909-985-5787






FAQ (Post-tensioning)

Applications ] Design ] Concrete ] Tendons ]

Post-tensioned concrete is a complex product. This section deals mainly with questions related to post-tensioned, slab-on-grade foundations and then only scratches the surface. For more specific information or a consultation please contact us directly.

What is prestressed concrete?

Concrete reinforced with steel tendons under tension.  

What is post-tensioned, prestressed concrete?

Concrete that is prestressed by tensioning it's tendons after it has been previously cast and cured.

What are post-tensioning tendons?

Very high tensile strength, twisted seven strand steel cables (prestressing strand) encased in a protective jacket with a lubricant/preservative and assembled with an anchor at each end to hold them under tension.

What are post-tensioning anchors?

Cast steel end-fittings with internal grippers that are applied to each end of a tendon to retain its tension and transfer that force to the concrete.

How are the tendons installed?

The tendons are placed in the concrete forms according to an engineered plan and with one end protruding externally for the purpose of elongating with a jack.

How are the tendons tensioned?

A hydraulic jack is fitted to the jacking end of each tendon and against its anchor.  When jacked,  the tendon is elongated to a specified force and then locked off to retain that force.





Copyright 2000-2004 PTD Inc.  All rights reserved.
Web by Pe Associates.  Contact the Webmaster with
comments or suggestions