PowerPoint Presentation

NON DESTRUCTIVE TESTING USING GPR

Ali Baluwala 726072Ahmed Aseem - 728459Research Supervisor Dr. Lihai ZhangSecondary Supervisor Saeed Miramini

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2What is Non Destructive Testing (NDT)?NDT is a method of on-site assessment of various engineering constructions using different instruments. The results obtained from this instruments are then interpreted to determine the various parameters such as positioning of reinforcement, corrosion, voids in concrete, compressive strength, deflection etc.

3Types of InstrumentsGround Penetration Radar (GPR)Ultra Sonic Pulse Velocity (UPV)CORMAPARAMIS

4Ground Penetration Radar (GPR)1 x IDS GPR Aladdin TR BIP 2GHz Antenna and equipment cables1 x DAD FastWave control unit1 x 12.6V Car Battery with converting cables1 x Panasonic Toughbook loaded with IDS K2 FastWave, GRED HD Software and charger

5Objective of ResearchDetermine the position of Reinforcement bars in ConcreteDetermine the depth of Structural ElementsIdentifying the subsurface utilities Identify different anomalies (i.e. Voids, Honeycombing etc.) in the ConcreteGetting an idea about the moisture content Modelling of Results using GRED HD software for ease of data interpretation

6MethodologyCasting of Sample with known irregularities Validating Results with GPRTesting on Actual Bridge/Structure

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Casting of SampleSample of size (300 x 300 x 200) mm was casted.Reinforcement 7.6mm diameter positioned at 50 mm from top running in both direction.

8Results From Sample

9Conclusion from SampleSample too small, difficult to understand the result.Large sample required.

10After consulting our supervisor we came with an idea of using the concrete lab floor slab as a test sample.Prepare a 1m x 1m Grid with 100mm spacingEquipment Calibration Scans in both transverse and lateral direction to prepare a 3D Model

Concrete Lab Floor Slab Assessment

11Slab Longitudinal ScanScanning was done in both lateral and longitudinal direction, the results are shown below.

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Slab Longitudinal Scan

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Slab Transversal Scan

14Findings from Floor Slab13 Reo bars with 25mm diameter in Longitudinal Direction @250mmVarying Profile of Reinforcement of bars due to Slab Junction6 Reo bars with 25mm diameter in Transverse DirectionHigh Region of Moisture Content detected Depth of 300mm was scanned out of 1200mm using 2GHZ antennae

15Modelling on Gred HD

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Slab Model

18Pedestrian bridge located on the intersection of Swanston and Elgin was selected for the assessment. Assumptions500mm x 500mm Grid100 mm Spacing

Assessment of Bridge

19Transverse Direction

8 Bars in Transverse Direction Bar Diameter of 30mmBar Spacing of 125mmNo Serious Voids/Moisture Content DetectedCover of 65mm to Bar

20Longitudinal Direction4 Bars in Longitudinal Direction per 1m ScanBar Diameter of 30mmSpacing increased to 250mmNo Serious Voids/Moisture Content DetectedCover of 30mm to Bar

21ModelLesser spacing of Transverse Reinforcement shows the bridge is heavily reinforced

22ConclusionExact location of Reinforcement BarsPhysical properties of bars, cover and spacing Depth of Structural ElementsRegion of voids and moisture Contents

23AcknowledgementsWe would like to acknowledge our supervisor Dr. Lihai Zhang and Dr. Saeed Miramini for their support through out the project. Also, we would like to appreciate help and support provided by;Prof. Priyan MendisMr. Ruben Barnes Mr. Aamir OrangiDepartment of Space Management, The University of MelbourneDepartment of Infrastructure Engineering, The University of Melbourne

24Thank you