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E31.2 E32.2

Conquest and Post Tensioning Scanning

Introduction to Post Tension

Post TensioningPost-Tensioning (PT) is a method of reinforcing (strengthening) concrete or other materials with high-strength steel strands. The benefits post-tensioning brings to a structure include large open plan, column free floor spaces.

The technology reduces the amount of conventional reinforcement and concrete required thus delivering a more economical and environmentally friendly solution. With its varied depth and presence in slabs amongst reinforcing steel and other embedments GPR is the suitable technology to locate and avoid it. 

Please follow this link to read more about the GPR products offered by PCTE

Conquest and PT

The Conquest 100 or Conquest Enhanced use Ground Penetrating Radar (GPR) technology which uses radio waves to locate objects of differing dielectric constant. Therefore materials such as plastics, metals, and filling material can be located.

One of the main applications of the Conquest is to locate PT. Its antenna has the right frequency to develop a crisp image and at the same time get the necessary depth, this combination is a critical factor when locating PT.

Why? It is essential to differentiate the PT from the steel reinforcement in the concrete for Q&A or if drilling is needed. The Conquest is specifically designed for this type of application.

Scan Line Mode

conquest line PT

This mode is easy and quick to use. The antenna is scanned across a section (perpendicular to the rebar and PT) creating an image as below.

The first layer of reinforcement are marked with green dots and the Post Tension are marked with blue ones.

Grid Scan Mode

conquest grid PT
This mode is used when a detailed inspection of a certain area is needed. Collecting a grid of data results using the grid maps creates a data cube or 3D volume that can be visualized as a series of 2.5 cm thick depth slices or as a solid.

On the first sliced Image we can see the first layer of rebar at 100 mm depth. The second slice show one PT conduit at 250 mm depth running across the scan with a second intersecting approximately midway running perpendicular.
Help and Training

PCTE can also provide training with every GPR sold. Our experienced trainers have a range of techniques used specifically for locating PT, even in difficult areas.

 

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Melbourne

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