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An Approach to Detect Steel Corrosion in Concrete Using Global Strain Measurement

Weakening of concrete structures by steel reinforcement corrosion is a concern. The paper represents results from an investigation involving testing of small scale prestressed concrete beams to correlate steel corrosion to global strain changes.

Product Number: 51317--9302-SG
ISBN: 9302 2017 CP
Author: Dewan Hossain
Publication Date: 2017
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Premature strength deterioration of concrete structures caused by steel reinforcement corrosion is a concern. The presented work represents results from an experimental investigation involving testing of small scale reinforced concrete and prestressed concrete beams to correlate steel corrosion to global strain changes in the beam. Concrete beams (4inch x 4inch x 15inch) with reinforced and prestressed wire were used in aggressive corrosion environment to accelerate steel cross-section loss. Electrochemical polarization techniques was used to control and measure steel corrosion activity. The mechanical performance of the beam initially loaded in flexure considered linear elastic behavior but testing to beam failure was also conducted. The strain profile of the loaded corroding beam was monitored by surface strain gauges at the extreme fiber and intermediate beam depths. The test results obtained from the experimental work were further investigated with the finite element (F.E.) simulation program ANSYS to model the combined influence of expansive corrosion product development loss of steel cross-sectional area and mid-span static loading on concrete beams. Instrumentation data was also used with F.E. models to validate the change of global strain behavior of corroded beams with corrosion strain time history.

Keywords: reinforced; prestressed; vibrating wire strain gauges); linear elastic; global strain; finite element simulation

Keywords: reinforced, prestressed, vibrating wire strain gauges, linear elastic, global strain, finite element simulation

Premature strength deterioration of concrete structures caused by steel reinforcement corrosion is a concern. The presented work represents results from an experimental investigation involving testing of small scale reinforced concrete and prestressed concrete beams to correlate steel corrosion to global strain changes in the beam. Concrete beams (4inch x 4inch x 15inch) with reinforced and prestressed wire were used in aggressive corrosion environment to accelerate steel cross-section loss. Electrochemical polarization techniques was used to control and measure steel corrosion activity. The mechanical performance of the beam initially loaded in flexure considered linear elastic behavior but testing to beam failure was also conducted. The strain profile of the loaded corroding beam was monitored by surface strain gauges at the extreme fiber and intermediate beam depths. The test results obtained from the experimental work were further investigated with the finite element (F.E.) simulation program ANSYS to model the combined influence of expansive corrosion product development loss of steel cross-sectional area and mid-span static loading on concrete beams. Instrumentation data was also used with F.E. models to validate the change of global strain behavior of corroded beams with corrosion strain time history.

Keywords: reinforced; prestressed; vibrating wire strain gauges); linear elastic; global strain; finite element simulation

Keywords: reinforced, prestressed, vibrating wire strain gauges, linear elastic, global strain, finite element simulation

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