Paper Information

Journal:   INTERNATIONAL JOURNAL OF ADVANCED STRUCTURAL ENGINEERING   JUNE 2016 , Volume 8 , Number 2; Page(s) 161 To 168.
 
Paper: 

NDT EVALUATION OF LONG-TERM BOND DURABILITY OF CFRP-STRUCTURAL SYSTEMS APPLIED TO RC HIGHWAY BRIDGES

 
 
Author(s):  CRAWFORD KENNETH C.*
 
* CRAWFORD TECHNOLOGIES AND APPLICATIONS LLC, CRAWFORDSVILLE, IN 47933, USA
 
Abstract: 

The long-term durability of CFRP structural systems applied to reinforced-concrete (RC) highway bridges is a function of the system bond behavior over time. The sustained structural load performance of strengthened bridges depends on the carbon fiber-reinforced polymer (CFRP) laminates remaining 100 % bonded to concrete bridge members. Periodic testing of the CFRP–concrete bond condition is necessary to sustain load performance. The objective of this paper is to present a non-destructive testing (NDT) method designed to evaluate the bond condition and long-term durability of CFRP laminate (plate) systems applied to RC highway bridges. Using the impact-echo principle, a mobile mechanical device using light impact hammers moving along the length of a bonded CFRP plate produces unique acoustic frequencies which are a function of existing CFRP plate–concrete bond conditions. The purpose of this method is to test and locate CFRP plates de-bonded from bridge structural members to identify associated deterioration in bridge load performance. Laboratory tests of this NDT device on a CFRP plate bonded to concrete with staged voids (de-laminations) produced different frequencies for bonded and de-bonded areas of the plate. The spectra (bands) of frequencies obtained in these tests show a correlation to the CFRP–concrete bond condition and identify bonded and de-bonded areas of the plate. The results of these tests indicate that this NDT impact machine, with design improvements, can potentially provide bridge engineers a means to rapidly evaluate long lengths of CFRP laminates applied to multiple highway bridges within a national transportation infrastructure.

 
Keyword(s): CFRP PLATES NON-DESTRUCTIVE TESTING BOND IMPACT-ECHO FREQUENCY BRIDGES
 
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