Post-Tensioning

Post-Tensioning is a method of pre-stressing. Instead of stressing the reinforcing inside of large steel buttresses at a manufacturing plant, the reinforcement is simply installed on the job site after the contractor forms up the slabs or constructs the walls. The reinforcing steel is housed in a sheathing or duct that prevents the steel from bonding to the concrete so that it can be stressed after the concrete cures. Using the post-tensioning method of pre-stressing enables a builder to get all the advantages of pre-stressed concrete or masonry while still enabling the freedom to construct the member (slab, wall, column, etc,) on the job site. A typical steel strand used for post-tensioning has a tensile strength of 270,000 pounds per square inch. In comparison, a typical non pre-stressed piece of reinforcing rebar has a tensile strength of 60,000-psi. Strands typically have a diameter of 0.5 in., and are stressed to a force of 33,000 pounds using a hydraulic jack.

In recent years By-Crete has made it their goal to be available to post-tension the Box Culverts we provide for our customers. With this goal in mind, we sent two men to Miami, Florida to attend the PTI Institute held April 20-23, 2007. The Post-Tensioning Institute is a nationally recognized certification program specifically targeting the post-tensioning field. Harry “Rusty” Fox, Jr. and Jason Sechrist are certified Level 1 (PT) Post Tensioning installers.