Unclassified 



CLASSIFICATION OF THIS PAGE (When Doto Fn 



REPORT DOCUMENTATION PAGE 



REPORT NU 



TN-1703 



2 GOVT ACCESSION NO 



DN044010 



EVALUATION OF NONDESTRUCTIVE UNDERWATER 

 TIMBER INSPECTION TECHNIQUES 



= E OF REPORT & PERIOO COVERED 



Not final; Jun 1981 - Aug 1983 



4G ORG. REPOF 



CONTRACT 



C. A. Keeney and S. E. Pollio 



PERFORMING ORGANIZATION NAME AND ADDRESS 



NAVAL CIVIL ENGINEERING LABORATORY 



Port Hueneme, California 93043 



ROJECT. TASK 



YF60.534.091.01.202B 



I. CONTROLLING OFFICE NAME AND ADDRESS 



Naval Facilities Engineering Command 

 Alexandria, Virginia 22332 



August 1984 



58 



■IBER OF PAGES 



16 AGENCY NAME » ADDRESSf. 



Unclassified 



15« DECLASSIFICATION DOWNGRADING 

 SCHEDULE 



16 DISTRIBUTION STATEMEN 



Approved for public release; distribution unlimited. 



ION STATEMEI- 



Block 20. II dtller, 



Underwater inspection, nondestructive testing, waterfront facilities, ultrasonic testing, 

 impact testing, computerized axial tomography, timber inspection 



20 ABSTRACT (Can 



nd Identity by block number) 



This report presents the assessment of potential techniques for underwater nonde- 

 structive testing of timber piles. Three techniques are discussed: X-ray tomography, 

 indirect ultrasonic testing, and impact testing. A computerized axial tomography (CAT) 

 system has never been used underwater to date. However, studies concluded that the 

 underwater application of tomography is technically feasible. A brief introduction to the 

 proposed prototype underwater CAT system is presented. In addition, results of laboratory 



DD | j°J M 73 1473 EDITION OF I NOV 65 IS OBSOLETE 



Unclassified 



(continued) 



SECURITY CLASSIFICATION OF THIS PAGE (When Date Entered) 



MBL/WHOI 



Q 03D1 OOMQElb D 



