A primer a basic concept to understand is that concrete is strong in compression and weak in tension.
Post tension cable slab foundation.
The home builders theory is that they can achieve a minimum of 50 psi pounds per square inch compression throughout the slab and most importantly at the middle of the.
When errors are made on site during the post tensioning process the ability of the reinforcement to prevent cracking is decreased.
Campbell the post tension cable system for concrete slab foundations that has and is replacing the standard steel rebar system has a fundamental flaw.
Post tension services of texas ptst is a full service post tension company based in dallas.
Flexural cracks develop when.
Errors that lead to cracks in post tensioned slabs.
Cables are arranged as indicated by the engineer and chaired to run through the center of the slab.
A post tensioned foundation is a concrete slab foundation that is reinforced with stranded steel cables that are tensioned after.
This tension makes the concrete slab and foundation much stronger than concrete without reinforcement and helps reduce cracking.
For residential construction tendons at 48 inches on center are common.
Commercial foundations will have much more steel.
Construction of post tensioned slabs on grade is very similar to using reinforcing steel except for the tensioning step.
Post tensioned slabs are thinner and lighter which have trickle down effects on the both the building gravity and lateral force resisting systems including columns shear walls and foundations.
As a result it s best to construct a post tensioned slab giving the slab the strength to resist stresses caused by the soil.
The post tensioning institute designed post tensioned foundations.
A post tension slab is a concrete slab that has steel cables running through it that have been placed under 33 000 pounds of tension.
A post tension slab is a slab of concrete that has been pre stressed using a specific method to increase the strength of the concrete.
Foundation repair of post tension foundation including cables.
Several methods exist for pre stressing concrete with post tensioning being a very common one.