ConcrEITS: An Electrical Impedance Interrogator for Concrete Damage Detection Using Self-Sensing Repairs

Concrete infrastructure requires continuous monitoring to ensure any new damage or repair failures are detected promptly. A cost-effective combination of monitoring and maintenance would be highly beneficial in the rehabilitation of existing infrastructure. Alkali-activated materials have been used as concrete repairs and as sensing elements for temperature, moisture, and chlorides. However, damage detection using self-sensing repairs has yet to be demonstrated, and commercial interrogation solutions are expensive. Here, we present the design of a low-cost tomographic impedance interrogator, denoted the “ConcrEITS”, capable of crack detection and location in concrete using conductive repair patches. Results show that for pure material blocks ConcrEITS is capable of measuring 4-probe impedance with a root mean square error of ±5.4% when compared to a commercially available device. For tomographic measurements, ConcrEITS is able to detect and locate cracks in patches adhered to small concrete beam samples undergoing 4-point bending. In all six samples tested, crack locations were clearly identified by the contour images gained from tomographic reconstruction. Overall, this system shows promise as a cost-effective combined solution for monitoring and maintenance of concrete infrastructure. We believe further up-scaled testing should follow this research before implementing the technology in a field trial.

[1]  Mohammad Pour-Ghaz,et al.  Electrical impedance tomography-based sensing skin for quantitative imaging of damage in concrete , 2014 .

[2]  Jari P. Kaipio,et al.  Tikhonov regularization and prior information in electrical impedance tomography , 1998, IEEE Transactions on Medical Imaging.

[3]  Shaoxian Song,et al.  Effects of aggregates on the mechanical properties and microstructure of geothermal metakaolin-based geopolymers , 2018, Results in Physics.

[4]  Jinlong Pan,et al.  Electrical resistivity of fly ash and metakaolin based geopolymers , 2020 .

[5]  Aljoša Šajna,et al.  Assessment of alkali activated mortars based on different precursors with regard to their suitability for concrete repair , 2016 .

[6]  Klaas van Breugel Societal Burden and Engineering Challenges of Ageing Infrastructure , 2017 .

[7]  P. Konečný,et al.  Extended evaluation of durability-related field inspection data from concrete bridges under service , 2020 .

[8]  Hao Wang,et al.  Using fly ash to partially substitute metakaolin in geopolymer synthesis , 2014 .

[9]  Husnu S. Narman,et al.  Assessment and Use of Unmanned Aerial Vehicle for Civil Structural Health Monitoring , 2020, ANT/EDI40.

[10]  Crhistian C. Segura,et al.  Portable Measurement Systems Based on Microcontrollers to Test Durability of Structures: Mini-Review , 2020, Frontiers in Built Environment.

[11]  Theodore E. Matikas,et al.  NDT approach for characterization of subsurface cracks in concrete , 2011 .

[12]  Jack McAlorum,et al.  3D printed temperature-sensing repairs for concrete structures , 2020, Additive Manufacturing.

[13]  Odile Abraham,et al.  Concrete Crack Monitoring Using a Novel Strain Transfer Model for Distributed Fiber Optics Sensors , 2020, Sensors.

[14]  A. Boccaccini,et al.  Influence of sand on the mechanical properties of metakaolin geopolymers , 2014 .

[15]  Ignacio Mártil,et al.  A robust method to determine the contact resistance using the van der Pauw set up , 2017 .

[16]  J. Deventer,et al.  Geopolymer technology: the current state of the art , 2007 .

[17]  K. Sumangala,et al.  High performance MEMS accelerometers for concrete SHM applications and comparison with COTS accelerometers , 2016 .

[18]  M. Perry,et al.  Self-Sensing Alkali-Activated Materials: A Review , 2020, Minerals.

[19]  William R B Lionheart,et al.  A Matlab toolkit for three-dimensional electrical impedance tomography: a contribution to the Electrical Impedance and Diffuse Optical Reconstruction Software project , 2002 .

[20]  Habib Ammari,et al.  An Introduction to Mathematics of Emerging Biomedical Imaging , 2008 .

[21]  Ivana Murković Steinberg,et al.  A wireless potentiostat for mobile chemical sensing and biosensing. , 2015, Talanta.

[22]  Nemkumar Banthia,et al.  Bond strength between concrete substrate and metakaolin geopolymer repair mortar: Effect of curing regime and PVA fiber reinforcement , 2017 .

[23]  Jack McAlorum,et al.  Robotic spray coating of self-sensing metakaolin geopolymer for concrete monitoring , 2021 .

[24]  N. Kozhukhova,et al.  Effect of Mixing Procedure and Chemical Composition on Physical and Mechanical Performance of Geopolymers , 2021 .

[25]  Jack McAlorum,et al.  Geopolymer-based moisture sensors for reinforced concrete health monitoring , 2020, Sensors and Actuators B: Chemical.

[26]  Jiabin Jia,et al.  An Image Reconstruction Algorithm for Electrical Impedance Tomography Using Adaptive Group Sparsity Constraint , 2017, IEEE Transactions on Instrumentation and Measurement.

[27]  G. M. Revel,et al.  Electrical Resistivity and Electrical Impedance Measurement in Mortar and Concrete Elements: A Systematic Review , 2020, Applied Sciences.

[28]  Y. An,et al.  Probability-Based Concrete Carbonation Prediction Using On-Site Data , 2020 .

[29]  A. Hamilton,et al.  Ambient Cured Fly Ash Geopolymer Coatings for Concrete , 2019, Materials.

[30]  S. Bernal,et al.  Geopolymers and Related Alkali-Activated Materials , 2014 .

[31]  H. Kamarudin,et al.  Reviews on the Different Sources Materials to the Geopolymer Performance , 2013 .

[32]  Abbas Z. Kouzani,et al.  Miniature Resistance Measurement Device for Structural Health Monitoring of Reinforced Concrete Infrastructure , 2020, Sensors.

[33]  T. Almusallam,et al.  Characteristics of metakaolin-based geopolymer concrete for different mix design parameters , 2020, Journal of Materials Research and Technology.

[34]  T. Tallman,et al.  Structural health and condition monitoring via electrical impedance tomography in self-sensing materials: a review , 2020, Smart Materials and Structures.

[35]  S. Bhalla,et al.  A low-cost version of electro-mechanical impedance technique for damage detection in reinforced concrete structures using multiple piezo configurations , 2017 .