Title:
The steel-concrete interface and its impact on corrosion – an updated review and research perspectives
Author(s):
Ueli M. Angst and Mette R. Geiker
Publication:
Symposium Paper
Volume:
366
Issue:
Appears on pages(s):
102-110
Keywords:
concrete, durability, reinforcement corrosion, steel-concrete interface, cracks
DOI:
10.14359/51749236
Date:
10/1/2025
Abstract:
It is well known that the steel–concrete interface (SCI) influences corrosion of steel in concrete. Numerous factors related to the SCI have been hypothesized to affect the mechanism of corrosion initiation and propagation, including steel surface characteristics, interfacial concrete properties (voids, cracks, etc.), and conditions related to the exposure (e.g., SCI moisture state). This contribution offers an overview of current knowledge on these aspects. Additionally, recent advances toward a fundamental understanding of corrosion-related processes occurring at the SCI are highlighted, including a novel experimental methodology for studying the steel surface behavior, imaging of the SCI moisture state, and the impact of macroscopic voids. Finally, perspectives for future research are given.
Related References:
Angst, U. M. and B. Elsener (2017). “The size effect in corrosion greatly influences the predicted life span of concrete infrastructures.” Science Advances 3(8).
Angst, U. M., M. R. Geiker, M. C. Alonso, R. Polder, B. Elsener, O. B. Isgor, H. Wong, A. Michel, K. Hornbostel, C. Gehlen, R. François, M. Sanchez, M. Criado, H. Sørensen, C. Hansson, R. Pillai, S. Mundra, J. Gulikers, M. Raupach, J. Pacheco and A. Sagüés (2019). “The effect of the steel-concrete interface on chloride-induced corrosion
initiation in concrete – a critical review by RILEM TC 262-SCI.” Materials and Structures 52: 88.
Angst, U. M., M. R. Geiker, A. Michel, C. Gehlen, H. Wong, O. B. Isgor, B. Elsener, C. M. Hansson, R. Francois, K. Hornbostel, R. Polder, M. C. Alonso, M. Sanchez, M. J. Correia, M. Criado, A. Sagues and N. Buenfeld (2017). “The steel-concrete interface.” Materials and Structures 50(2): 143.
Angst, U. M., B. Isgor, C. M. Hansson, A. A. Sagüés and M. R. Geiker (2022). “Beyond the chloride threshold concept for predicting corrosion of steel in concrete.” Applied Physics Reviews 9: 011321.
Angst, U. M., E. Rossi, C. Boschmann Käthler, D. Mannes, P. Trtik, B. Elsener, Z. Zhou and M. Strobl (2024). “Chloride-induced corrosion of steel in concrete—insights from bimodal neutron and X-ray microtomography combined with ex-situ microscopy.” Materials and Structures 57(4): 56.
Boschmann, C., U. M. Angst, M. Wagner, C. K. Larsen and B. Elsener (2017). Effect of cracks on chloride-induced corrosion of steel in concrete - a review (NPRA report no. 454): 37.
Boschmann Käthler, C., U. M. Angst, G. Ebell and B. Elsener (2021). “Chloride-induced reinforcement corrosion in cracked concrete: The influence of time of wetness on corrosion propagation.” Corrosion Engineering, Science and Technology 56(1): 1-10.
Enevoldsen, J., C. Hansson and B. Hope (1994). “The Influence of Internal Relative Humidity on the Rate of Corrosion of Steel Embedded in Concrete and Mortar.” Cement and Concrete Research 24: 1373-1382.
Geiker, M., T. Danner, A. Michel, A. Belda Revert, O. Linderoth and K. Hornbostel (2021). “25 years of field exposure of pre-cracked concrete beams; combined impact of spacers and cracks on reinforcement corrosion.” Construction and Building Materials 286: 122801.
Geiker, M., S. Robuschi, K. Lundgren, C. Paraskevoulakos, C. Gundlach, T. Danner, U. H. Jakobsen and A. Michel (2023). “Concluding destructive investigation of a nine-year-old marine-exposed cracked concrete panel.” Cement and Concrete Research 165: 107070.
Hansson, C. M. (2011). “The impact of corrosion on society.” Metallurgical and Materials Transactions A 42(10): 2952-2962.
Hansson, C. M., T. Frølund and J. B. Markussen (1985). “The effect of chloride cation type on the corrosion of steel in concrete by chloride salts.” Cement and Concrete Research 15(1): 65-73.
Hansson, C. M. and B. Sørensen (1990). The threshold concentration of chloride in concrete for the initiation of reinforcement corrosion. Corrosion rates of steel in concrete. N. S. Berke, V. Chaker and D. Whiting, ASTM STP 1065: 3-16.
Jaffer, S. J. and C. M. Hansson (2008). “The influence of cracks on chloride-induced corrosion of steel in ordinary Portland cement and high performance concretes subjected to different loading conditions.” Corrosion Science 50(12): 3343-3355.
Mammoliti, L. T., L. C. Brown, C. M. Hansson and B. B. Hope (1996). “The influence of surface finish of reinforcing steel and pH of the test solution on the chloride threshold concentration for corrosion initiation in synthetic pore solutions.” Cement and Concrete Research 26(4): 545-550.
Marcos-Meson, V., M. Geiker, G. Fischer, A. Solgaard, U. H. Jakobsen, T. Danner, C. Edvardsen, T. L. Skovhus and A. Michel (2020). “Durability of cracked SFRC exposed to wet-dry cycles of chlorides and carbon dioxide – Multiscale deterioration phenomena.” Cement and Concrete Research 135: 106120.
Michel, L. and U. M. Angst (2018). Towards understanding corrosion initiation in concrete – Influence of local electrochemical properties of reinforcing steel. 5th Int. Conf. Concrete Repair, Rehabilitation and Retrofitting - ICCRRR, 2018. M. G. Alexander, H.-D. Beushausen, F. Dehn and P. Moyo. Cape Town, South Africa, CRC Press.
Michel, L. and U. M. Angst (2022). “Automated local electrochemical characterization on metals with complex shape and practice-related surface state.” Measurement 201: 111713.
Robuschi, S., O. L. Ivanov, M. Geiker, I. Fernandez and K. Lundgren (2022). “Impact of cracks on distribution of chloride-induced reinforcement corrosion.” Materials and Structures 56(1): 7.
Rossi, E., S. Governo, M. Shakoorioskooie, Q. Zhan, S. Mundra, D. Mannes, A. Kaestner and U. Angst (2023). “Xray computed tomography to observe the presence of water in macropores of cementitious materials.” RILEM Technical Letters 8: 165‐175.
Sagüés, A. A., A. N. Sánchez, K. Lau and S. C. Kranc (2014). “Service Life Forecasting for Reinforced Concrete Incorporating Potential-Dependent Chloride Threshold.” CORROSION 70(9): 942-957.
Wong, H. S., U. M. Angst, M. R. Geiker, O. B. Isgor, B. Elsener, A. Michel, M. C. Alonso, M. J. Correia, J. Pacheco, J. Gulikers, Y. X. Zhao, M. Criado, M. Raupach, H. Sorensen, R. Francois, S. Mundra, M. Rasol and R. Polder (2022). “Methods for characterising the steel-concrete interface to enhance understanding of reinforcement corrosion: a critical review by RILEM TC 262-SCI.” Materials and Structures 55(4).