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Monitoring corrosion of rebar embedd...

Ervin, Benjamin Lee.

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Monitoring corrosion of rebar embedded in mortar using guided ultrasonic waves.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Monitoring corrosion of rebar embedded in mortar using guided ultrasonic waves./
作者:	Ervin, Benjamin Lee.
面頁冊數:	330 p.
附註:	Adviser: Henrique Reis.
Contained By:	Dissertation Abstracts International68-11B.
標題:	Engineering, Civil. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3290229
ISBN:	9780549339946

Monitoring corrosion of rebar embedded in mortar using guided ultrasonic waves.
Ervin, Benjamin Lee.

Monitoring corrosion of rebar embedded in mortar using guided ultrasonic waves. - 330 p.

Adviser: Henrique Reis.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.

This thesis investigates the use of guided mechanical waves for monitoring uniform and localized corrosion in steel reinforcing bars embedded in concrete. The main forms of structural deterioration from uniform corrosion in reinforced concrete are the destruction of the bond between steel and concrete, the loss of steel cross-sectional area, and the loss of concrete cross-sectional area from cracking and spalling. Localized corrosion, or pitting, leads to severe loss of steel cross-sectional area, creating a high risk of bar tensile failure and unintended transfer of loads to the surrounding concrete.

ISBN: 9780549339946Subjects--Topical Terms:

783781
Engineering, Civil.

Monitoring corrosion of rebar embedded in mortar using guided ultrasonic waves.
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245 1 0 $a Monitoring corrosion of rebar embedded in mortar using guided ultrasonic waves.
300 $a 330 p.
500 $a Adviser: Henrique Reis.
500 $a Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7382.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.
520 $a This thesis investigates the use of guided mechanical waves for monitoring uniform and localized corrosion in steel reinforcing bars embedded in concrete. The main forms of structural deterioration from uniform corrosion in reinforced concrete are the destruction of the bond between steel and concrete, the loss of steel cross-sectional area, and the loss of concrete cross-sectional area from cracking and spalling. Localized corrosion, or pitting, leads to severe loss of steel cross-sectional area, creating a high risk of bar tensile failure and unintended transfer of loads to the surrounding concrete.
520 $a Reinforcing bars were used to guide the waves, rather than bulk concrete, allowing for longer inspection distances due to lower material absorption, scattering, and divergence. Guided mechanical waves in low frequency ranges (50-200 kHz) and higher frequency ranges (2-8 MHz) were monitored in reinforced mortar specimens undergoing accelerated uniform corrosion. The frequency ranges chosen contain wave modes with varying amounts of interaction, i.e. displacement profile, at the material interface. Lower frequency modes were shown to be sensitive to the accumulation of corrosion product and the level of bond between the surrounding mortar and rebar. This allows for the onset of corrosion and bond deterioration to be monitored. Higher frequency modes were shown to be sensitive to changes in the bar profile surface, allowing for the loss of cross-sectional area to be monitored. Guided mechanical waves in the higher frequency range were also used to monitor reinforced mortar specimens undergoing accelerated localized corrosion. The high frequency modes were sensitive to the localized attack. Also promising was the unique frequency spectrum response for both uniform and localized corrosion, allowing the two corrosion types to be differentiated from through-transmission evaluation. The isolated effects of the reinforcing ribs, simulated debonding, simulated pitting, water surrounding, and mortar surrounding were also investigated using guided mechanical waves.
520 $a Results are presented and discussed within the framework of a corrosion process degradation model and service life. A thorough review and discussion of the corrosion process, modeling the propagation of corrosion, nondestructive methods for monitoring corrosion in reinforced concrete, and guided mechanical waves have also been presented.
590 $a School code: 0090.
650 4 $a Engineering, Civil. $3 783781
650 4 $a Physics, Acoustics. $3 1019086
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790 1 0 $a Reis, Henrique, $e advisor
791 $a Ph.D.
792 $a 2007
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