PFS Post Tension Concrete
Increases the longevity of the running track surface
Post Tension Concrete is being selected for running tracks due to long term cost savings resulting from increased longevity and improved performance for the life of the running track surface. Post-tensioning Concrete (PTC) was developed in France during the 1930’s when it was realized that placing concrete in compression greatly increased its strength. Post-tensioning involves encasing sheathed cables in a concrete slab, then stressing and locking the cables after the concrete has set up.
Post-tensioning provides active reinforcement. Although all concrete cracks, this method limits the number and size of the cracks so that they do not affect longevity or performance. In addition, Post Tension Concrete offers improved drainage vs. Asphalt and can reduce the effects of Freeze-Thaw in colder climates, again increasing the longevity of the running track surface.
Post Tension Concrete (PTC) can eliminate the irregularities from Asphalt such as cracks, deviations in the planarity or settling. Any of these can be detrimental to the running surface, effecting performance and life of the running track.
PTC employs the use of ½” stranded cables encased in a sheath. The cables have a tensile strength 4 times higher than the average pre-stressed rebar. The sheathing allows the cables to move when the tensioning stress is applied.
Post-Tension running tracks are often installed to correct site problems and because they provide the “forever” running track base. The base will last an extremely long time and allow for repeated surfaces to be installed without replacing or repairing the base. Sites with unsuitable or questionable soil may require post-tensioned concrete as the only long-term answer for certain types of soil conditions.