CONTENTS 



Page 



INTRODUCTION 1 



BACKGROUND 1 



CONCRETE DETERIORATION AND INSPECTION REQUIREMENTS 2 



MAGNETIC REBAR LOCATION - R-METER 4 



General Description and Operation 4 



Modifications for Underwater Use 5 



Laboratory Test Results 5 



SCHMIDT HAMMER 7 



General Description and Operation 7 



Modifications for Underwater Use 8 



Laboratory Test Results 8 



ULTRASONIC TESTING 10 



Background 10 



Equipment Description ... 12 



Laboratory Evaluation 12 



FIELD TEST RESULTS 15 



Background 15 



Test Results 16 



CONCLUSIONS AND RECOMMENDATIONS 20 



REFERENCES 21 



APPENDIX - Nominal Dimensions of Reinforcing Steel A-l 



vii 



