scholarly journals Nondestructive Evaluations by Using a Prototype of a Microwave Tomograph

10.5772/51488 ◽  
2012 ◽  
Author(s):  
R. Monleone ◽  
M. Pastorino ◽  
S. Poretti ◽  
A. Randazzo ◽  
A. Massimini ◽  
...  
Keyword(s):  
Nondestructive Evaluations

scholarly journals Combination of nondestructive evaluations for reliable assessment of bridge deck

2011 ◽  
Vol 9 (1) ◽  
pp. 11-22 ◽  
Author(s):  
A.R. Khalim ◽  
D. Sagar ◽  
M.D. Kumruzzaman ◽  
A.S.M.Z. Hasan
Keyword(s):  
Evaluation Method ◽  
Bridge Management ◽  
Destructive Testing ◽  
Condition Rating ◽  
Reliable Assessment ◽  
Nondestructive Evaluations ◽  
Repair Activity ◽  
Different Response ◽  
Damage Type ◽  
Non Destructive

Non-destructive evaluation (NDE) has offered unprecedented utilize for bridge management body to monitor structural health. None of these evaluation methods can provide all the damage information (damage category, quantitative assessment) alone which is required for necessary repair activity and condition rating of structure. In most of the cases, the response of one evaluation method implies the presence of a defect among the multiple defects to which the evaluation method is sensitive. This paper is concerned with the combination of different non-destructive testing to find out the type of damage with the most efficient way. The different response (positive or negative) obtained from each combination and how it confirms the defect is shown through the mathematical set operation. Thus, this study would assist field investigator to ascertain the type of defect which subsequently aids to rate structure based on damage type.

Evaluation of Use of Lithium Nitrate in Controlling Alkali-Silica Reactivity in Existing Concrete Pavement

2005 ◽  
Vol 1914 (1) ◽  
pp. 34-44
Author(s):  
Christopher Y. Tuan ◽  
Michael T. Kelly ◽  
Haosu Sun ◽  
Mark E. Buss
Keyword(s):  
Concrete Pavement ◽  
Vacuum Impregnation ◽  
Hardened Concrete ◽  
Lithium Content ◽  
Lithium Nitrate ◽  
Impact Echo ◽  
Nondestructive Evaluations ◽  
Application Techniques ◽  
Powder Samples ◽  
Tension Testing

The study presents the findings from a 2-year field trial in which lithium nitrate was applied at a rate of 0.006 gal/ft2 twice a year on an existing concrete pavement in Norfolk, Nebraska, in an attempt to arrest ongoing alkali–silica reaction (ASR) distress. Various destructive and nondestructive means were used to measure the effectiveness of the treatments. Concrete cylinders were cored for petrographic examination and split tension testing. Powder samples were taken to determine the lithium content. Nondestructive evaluations used crack mapping, a Schmidt hammer, a velocity meter, and an impact echo apparatus. The amount of lithium that penetrated into the pavement by gravity soaking has been limited. The results to date have not shown a definitive benefit of application of the lithium material in controlling or mitigating the ASR process; presumably, the pavement has not reached the state of deterioration optimal for lithium penetration. The feasibility and effectiveness of other application techniques on hardened concrete, such as electrolysis, surface pressurization, and vacuum impregnation, should be investigated for comparison with the feasibility and effectiveness of gravity soaking.

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