Civil Engineering

Slab On Ground

Slab On Ground

Post tensioning brings a number of unique benefits to the design and construction of slab on ground applications.

Common issues involved with the construction of slabs on ground include:

  • Any mass pour concrete is subject to creep and shrinkage during curing, which can lead to cracking if uncontrolled.
  • Slabs are particularly susceptible to cracking. The most common way to control this is with regular joints, either saw cuts or full expansion joints at typically 6-8m spacing.
  • This leads to both large construction costs, up to 20% of initial construction value, and significant long-term maintenance costs.
  • Joints also place limits on use of space.

By utilising a post tensioned slab on ground solution, the following benefits can be achieved:

  • Significant reduction in joints bringing cost savings and improvements to operational performance, particularly in slabs with high traffic movement.
  • Standard tendon lengths are 60m, compared to joint spacing of conventionally reinforced slab of 6-8m.
  • 2,000-3,000sqm joint free pours are typical, up to 6,000sqm has also been achieved.
  • Reduction in long term maintenance requirements due to reduced joint requirements, indicatively up to 60% cost saving.
  • Increased loading capacity or reduction in slab thickness with significant material savings.
  • Increased durability.

Typical applications for post-tensioning slabs on ground include:

  • Logistics warehouses.
  • Distribution centres.
  • Bulk solid stores.
  • Maintenance facilities.
  • Refrigeration stores.
  • Container handling facilities.
  • Special applications.