Estimation of Corrosion Damage in Steel Reinforced Mortar Using Guided Waves

Corrosion of reinforced concrete is a chronic infrastructure problem, particularly in areas with deicing salt and marine exposure. To maintain structural integrity, a testing method is needed to identify areas of corroding reinforcement. For purposes of rehabilitation, the method must also be able to evaluate the degree, rate, and location of damage. Toward the development of a wireless embedded sensor system to monitor and assess corrosion damage in reinforced concrete, reinforced mortar specimens were manufactured with seeded defects to simulate corrosion damage. Taking advantage of waveguide effects of the reinforcing bars, these specimens were then tested using an ultrasonic approach. Using the same ultrasonic approach, specimens without seeded defects were also monitored during accelerated corrosion tests. Both the ultrasonic sending and the receiving transducers were mounted on the steel rebar. Advantage was taken of the lower frequency (<250 kHz) fundamental flexural propagation mode because of its relatively large displacements at the interface between the reinforcing steel and the surrounding mortar. Waveform energy (indicative of attenuation) is presented and discussed in terms of corrosion damage. Current results indicate that the loss of bond strength between the reinforcing steel and the surrounding concrete can be detected and evaluated.

[1]  Tribikram Kundu,et al.  A comparison of steel/concrete and glass fiber reinforced polymers/concrete interface testing by guided waves , 2003 .

[2]  J. M. Caussignac,et al.  Bearings of a bridge fitted with load measuring devices based on an optical fiber technology , 1992, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[3]  J. Rose.  Ultrasonic Waves in Solid Media , 1999 .

[4]  M. Beard,et al.  Guided wave inspection of embedded cylindrical structures , 2002 .

[5]  William B. Spillman,et al.  Structural member vibration measurements using a fiber optic sensor , 1991 .

[6]  Khaled Soudki,et al.  BEHAVIOUR OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH CARBON FIBRE REINFORCED POLYMER LAMINATES SUBJECTED TO CORROSION DAMAGE , 2000 .

[7]  A. Vary.  The Acousto-Ultrasonic Approach , 1988 .

[8]  S. Pantazopoulou,et al.  Corrosion Effects on Bond Strength in Reinforced Concrete , 1999 .

[9]  Fan Wu,et al.  Built-in active sensing diagnostic system for civil infrastructure systems , 2001, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[10]  Daniele Inaudi,et al.  Bridge monitoring by fiber optic deformation sensors: design, emplacement, and results , 1996, Smart Structures.

[11]  A. Emin Aktan,et al.  Role of NDE in bridge health monitoring , 1999, Smart Structures.

[12]  M. S. Elgarf,et al.  Flexural Strength of Concrete Beams with Corroding Reinforcement , 1999 .

[13]  Mary Sansalone,et al.  Detection of distributed damage in concrete using transient stress waves , 1998, Smart Structures.

[14]  Youping Liu,et al.  Modeling the Time-to Corrosion Cracking of the Cover Concrete in Chloride Contaminated Reinforced Concrete Structures , 1996 .

[15]  P. Balaguru,et al.  BOND BEHAVIOR OF CORRODED REINFORCEMENT BARS , 2000 .

[16]  Peter Cawley,et al.  THE INSPECTION OF TENDONS IN POST-TENSIONED CONCRETE USING GUIDED ULTRASONIC WAVES , 1999 .

[17]  J. G. Cabrera,et al.  Deterioration of concrete due to reinforcement steel corrosion , 1996 .

[18]  R. Winston Revie,et al.  Uhlig's Corrosion Handbook , 2005 .

[19]  Steven B. Chase,et al.  Evaluation of dual-band infrared thermography system for bridge deck delamination surveys , 1998, Smart Structures.

[20]  F. Chang,et al.  Structural health monitoring from fiber-reinforced composites to steel-reinforced concrete , 2001 .

[21]  L. Pochhammer,et al.  Ueber die Fortpflanzungsgeschwindigkeiten kleiner Schwingungen in einem unbegrenzten isotropen Kreiscylinder. , 1876 .

[22]  Michael D. A. Thomas,et al.  Accelerated corrosion and repair of reinforced concrete columns using carbon fibre reinforced polymer sheets , 2000 .

[23]  Richard W Griffiths,et al.  Recent And Current Developments In Distributed Fiber Optic Sensing For Structural Monitoring , 1989, Other Conferences.

[24]  J. Broomfield.  Corrosion of Steel in Concrete: Understanding, investigation and repair , 1996 .

[25]  S. Mirza,et al.  Corrosion Influence on Bond between Steel and Concrete , 1999 .

[26]  G. J. Al-Sulaimani,et al.  Influence of Corrosion and Cracking on Bond Behavior and Strength of Reinforced Concrete Members , 1990 .

[27]  D. Bancroft.  The Velocity of Longitudinal Waves in Cylindrical Bars , 1941 .

[28]  Lawrence C. Lynnworth,et al.  Transverse shear to torsion mode converter and applications , 2004 .

[29]  C. Chree.  The Equations of an Isotropic Elastic Solid in Polar and Cylindrical Co-ordinates their Solution and Application , 1889 .

[30]  M.J.S. Lowe,et al.  Matrix techniques for modeling ultrasonic waves in multilayered media , 1995, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[31]  Rasheeduzzafar,et al.  EFFECT OF REINFORCEMENT CORROSION ON FLEXURAL BEHAVIOR OF CONCRETE SLABS , 1996 .

[32]  Martin Krause,et al.  Tests and assessments of NDT methods for concrete bridges , 1998, Smart Structures.

[33]  S. Kulendran,et al.  Finite Element Modeling of Corrosion Damage in Concrete Structures , 1992 .

[34]  Wilkins Aquino.  Long-Term Performance of Seismically Rehabilitated Corrosion -Damaged Columns , 2002 .

[35]  T. Kundu,et al.  Ultrasonic guided waves for steel bar concrete interface testing , 2002 .

[36]  Peter L. Fuhr,et al.  Fiber optic corrosion sensing for bridges and roadway surfaces , 1995, Smart Structures.

[37]  Nancy DelGrande,et al.  Delamination detection in reinforced concrete using thermal inertia , 1998, Smart Structures.