Group 6 Saman Ali Akbar Sukina Hussain - kth.se · Traditional two way mesuare density • Extract...
Transcript of Group 6 Saman Ali Akbar Sukina Hussain - kth.se · Traditional two way mesuare density • Extract...
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Group 6
Saman Ali Akbar Sukina Hussain
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Ø Density???
Ø The insufficient density Long-lasting Reduce the maintenance Reduece the rehabilitation cost
Ø Low density Oxidation Reveling Cracking Moisture damage
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Ø Traditional two way mesuare density • Extract core • Unclear density gauge
Ø Researches v Non-unclear density gauge
§ Non-radioactive tool § Used electromagnetic (EM) § Inherent advantages over the nuclear density guage
§ No stringent license § Specialized storage § Extra security precautions
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Ø IC } To provide continouos measurement } Large coverage } Commuri developed a neural network } The IC based on pavment stiffnes } Loading rate and stiffnes of base layer } Error measerument cause by deacrese of temperature
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GPR Ø Non destructive tool Ø A functioning pavement quality control Ø Compared three candidate density prediction
Ø Rayleigh mixing
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GPR Ø Several advantages
§ Collect data quicker than coring § Air-coupled GPR system
Ø GPR installation
Ø Anteena send EM waves Ø Ground-coupled antenna Ø Air-coupled antenna Ø Antenna frequency
Ø Material property for GPR Ø Permittivity Ø dielectric
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} General Concept § An effective tool for QA&QC § The main challenging the
surface water effect on GPR reflect signal
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} Advanced Transportation And Research Engineering Laboratory(ATREL)(University of Illinois)
§ 2 GHz air-coupled antenna § Limestone aggregate & PG
64-22 § Test temperature 63-66C § 3ft*3ft square are tested § 250 mL water § 1.7m wide drum (compactor) § Compressed air sprayer
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Whole Frequency spectrum Magnification of part of the spectrum for better visualization
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Figure a. Figure b.
Filtering GPR surface reflection signal
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Ø Comparison of feature value plots using different feature extraction approaches
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Ø Summary of test project
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} GPR data collection procedure
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Normalized feature value versus passing number of compactor
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Ø Thickness and density measurement after construction
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