2.3.4 Inspection techniques and equipment
The equipment, resources and techniques required for making inspections will vary with the type of inspection and the nature and type of structure.
Specific techniques exist for:
- simple applications – visual observations and soundings
- concrete and steel – destructive and non-destructive testing, crack detection, corrosion detection, stress detection, etc.
- timber bridges – probing, boring, moisture measurement, etc.
- specialised activities – radar, thermography, underwater inspections, precision levelling, photogrammetry, acoustic monitoring, chloride testing, measurement of crack movements, etc.
The non-visual techniques would be selectively utilised, typically at level 3 inspection stage, for specific structures, not the entire stock.
The range, nature and degree of sophistication of the techniques available to the asset manager are large and continue to increase as technology advances. Technical aspects of these techniques and their application in the management of road structures may be found in Austroads (2017a).