Since we started, we have been adding value to our clients through innovation, problem-solving and technical excellence through our specialist’s engineering and construction services.

Our core focus is on the design and delivery of superior post-tensioning systems and engineering solutions. We do this by providing technical consultancy and support for the full range of works from initial design to complex detailed dynamic analysis, from construction engineering to on-site activities.

Our commitment to continual improvement and innovation provides our clients with leading-edge technology and best industry practice. The results are cost-effective, reliable and efficient engineering solutions for post-tensioned and reinforced concrete construction.

Design Considerations

The depth of the slab is controlled by eliminating deflection and designing for punching shear. Post-tensioned concrete has pre-compression loads applied to the concrete, which ensures any deflections in the slab can be eliminated by good design practices.

The other design consideration is to ensure an adequate number of movement joints are provided in the slab. The maximum distance between movement joints is in the order of 50 metres. Without movement joints, the slab will be restrained and will crack due to creep, shrinkage and elastic shortening.

Construction Considerations

A typical construction sequence is as follows:

  1. Install slab soffit and edge formwork
  2. Fix the bottom slab reinforcement
  3. Fix the live anchorages to edge forms
  4. Install tendons
  5. Fix the tension support bars to the specific height
  6. Fix the punching shear reinforcement

The construction of the post-tensioned concrete slab is one of the fastest construction methods. This is because the formwork and back-propping can be removed earlier than with reinforced concrete slab construction, as the slab is able to be self-supporting.

A post-tensioned slab is flexible in accommodating openings and penetrations. The load capacity of the slab is not compromised if the post-tensioning is not evenly distributed along the floor. This allows openings to be provided in the slab, assuming proper details around the openings are documented on the drawings.

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