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GPR Application in Concrete and Roadway Inspection

    Home GPR Application in Concrete and Roadway Inspection

    Concrete Inspection
    In many situations, inspection of concrete structure using traditional non-destructive testing (NDT) methods such as acoustic emission and radiography (x-ray) is not practical. The processes can be time-consuming to complete, require evacuation of the area being tested, and demand considerable set-up time before the inspection can even begin. All of these factors can be unappealing to customers who need a fast, reliable, unobtrusive method.

    GPR quickly and accurately locates rebar, tension cables, plastic conduits and voids to a depth of 40-50cm in existing concrete structures (e.g., tunnels, walls, floors, slabs, decks, balconies and garages). In addition, it is used to detect and map the relative condition of concrete so that rehab projects can be prioritized and planned more effectively. For QA on new concrete structures, radar is used to inspect and measure slab thickness.

    Roadway Inspection
    GPR systems are now able to collect roadway information at speeds up to 100 km/h so that traffic flow is minimally affected. A high scan rate also permits imaging of small voids and pipes underneath the road. Both concrete roadway (up to 40cm) and bituminous/asphalt roadway (up to 90cm) can be surveyed with a high degree of accuracy. On new projects, accurate roadway thickness profiles collected continuously along roadways provide an excellent method of verifying adherence to QC/QA specifications. Roadway thickness accuracy is critical for establishing valid load capacities – a factor that greatly enhances the life of any roadway network. The digital “infrastructure profiles” can be archived for immediate access, and can facilitate the planning of long-term maintenance programs.

    Radar is also ideal for the identification and inventory of older roadway systems whose construction history is often unknown. Lack of good data presents an expensive challenge in determining whether to spot repair a stretch of roadway or to partially or fully reconstruct it.

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    More About GPR: How it works
    GPR Benefits in Civils and Mining
    Concrete & Roadway Inspection

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