Numerical Study on Chloride Ingress in Cement-Based Coating Systems and Service Life Assessment
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 5
Abstract
Chloride-induced corrosion is a critical issue for RC structures. Cement-based coatings can be used to protect concrete structures with unsatisfactory quality against chloride ingress. To evaluate the effectiveness of the coatings to extend the service life of coated concrete structures, the evolution of the chloride profile in the coated concrete structures should be determined. This paper investigated the mechanism of chloride ingress into coated concrete structures (i.e., coatings made of cement paste and concrete substrate). A numerical tool is proposed for calculating the chloride profiles in the coated concrete structures. A parametric study investigated the influence of several factors on the chloride ingress: the water:cement () ratio of the coating, the thickness of the coating, and early or late application of the coating. A preliminary cost analysis of coating materials was carried out. The results showed that the effectiveness of the coatings increased with coating thickness at a drastic increase of material cost; the effectiveness of the coatings increased with the decrease of the ratio at a moderate increase of material cost. In order to extend the service life of the substrate, a coating with a low ratio is recommended, and the coating thickness should be designed depending on the requirements. Moreover, the exposure history of the substrate before application of the coating also has an influence on the effectiveness of the coating. To protect an existing concrete structure exposed to a chloride environment against rapid chloride ingress, it is preferable to apply a coating as early as possible, because the effectiveness of the coating is reduced by late application.
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Acknowledgments
Financial support by the Dutch Technology Foundation (STW) for Project 10981, Durable Repair and Radical Protection of Concrete Structures in View of Sustainable Construction, is gratefully acknowledged.
References
Al-Dulaijan, S., M. Maslehuddin, M. Al-Zahrani, E. Al-Juraifani, S. Alidi, and M. Al-Mehthel. 2000. “Performance evaluation of cement-based surface coatings.” In Proc., 4th ACI Int. Conf. on Repair, Rehabilitation, and Maintenance of Concrete Structures, and Innovations in Design and Construction. Seoul: American Concrete Institute.
Almusallam, A., F. M. Khan, and M. Maslehuddin. 2002. “Performance of concrete coating under varying exposure conditions.” Mater. Struct. 35 (8): 487–494. https://doi.org/10.1007/BF02483136.
Angst, U., B. Elsener, C. K. Larsen, and Ø. Vennesland. 2009. “Critical chloride content in reinforced concrete: A review.” Cem. Concr. Res. 39 (12): 1122–1138. https://doi.org/10.1016/j.cemconres.2009.08.006.
Bentz, D. P., E. J. Garboczi, Y. Lu, N. Martys, A. R. Sakulich, and W. J. Weiss. 2013. “Modeling of the influence of transverse cracking on chloride penetration into concrete.” Cem. Concr. Compos. 38 (2): 65–74. https://doi.org/10.1016/j.cemconcomp.2013.03.003.
Bolzoni, F., M. Ormellese, and A. Brenna. 2011. “Efficiency of concrete coatings on chloride-induced corrosion of reinforced concrete structures.” In Proc., NACE-Int. Corrosion Conf. Series. Houston: NACE International, Publications Division.
Caré, S. 2003. “Influence of aggregates on chloride diffusion coefficient into mortar.” Cem. Concr. Res. 33 (7): 1021–1028. https://doi.org/10.1016/S0008-8846(03)00009-7.
Carrara, P., and L. De Lorenzis. 2017. “Chloride diffusivity of the interfacial transition zone and bulk paste in concrete from microscale analysis.” Modell. Simul. Mater. Sci. Eng. 25 (4): 045011. https://doi.org/10.1088/1361-651X/aa68d4.
Christensen, R. M. 2012. Mechanics of composite materials. Mineola, NY: Dover Publications.
Diamanti, M. V., A. Brenna, F. Bolzoni, M. Berra, T. Pastore, and M. Ormellese. 2013. “Effect of polymer modified cementitious coatings on water and chloride permeability in concrete.” Constr. Build. Mater. 49 (6): 720–728. https://doi.org/10.1016/j.conbuildmat.2013.08.050.
Garboczi, E., and D. Bentz. 1992. “Computer simulation of the diffusivity of cement-based materials.” J. Mater. Sci. 27 (8): 2083–2092. https://doi.org/10.1007/BF01117921.
Gulikers, J. 2006. “Considerations on the reliability of service life predictions using a probabilistic approach.” J. Phys. IV (Proc.) EDP Sci. 136 (1): 233–241. https://doi.org/10.1051/jp4:2006136024.
Hirao, H., K. Yamada, H. Takahashi, and H. Zibara. 2005. “Chloride binding of cement estimated by binding isotherms of hydrates.” J. Adv. Concr. Technol. 3 (1): 77–84. https://doi.org/10.3151/jact.3.77.
Jennings, H. M., J. W. Bullard, J. J. Thomas, J. E. Andrade, J. J. Chen, and G. W. Scherer. 2008. “Characterization and modeling of pores and surfaces in cement paste: Correlations to processing and properties.” J. Adv. Concr. Technol. 6 (1): 5–29. https://doi.org/10.3151/jact.6.5.
Jennings, H. M., and P. D. Tennis. 1994. “Model for the developing microstructure in portland cement pastes.” J. Am. Ceram. Soc. 77 (12): 3161–3172. https://doi.org/10.1111/j.1151-2916.1994.tb04565.x.
Koenders, E. A. B. 1997. “Simulation of volume changes in hardening cement-based materials.” Ph.D. dissertation, Dept. of Concrete Structures, Delft Univ. of Technology.
Mangat, P. S., and M. C. Limbachiya. 1999. “Effect of initial curing on chloride diffusion in concrete repair materials.” Cem. Concr. Res. 29 (9): 1475–1485. https://doi.org/10.1016/S0008-8846(99)00130-1.
Mangat, P. S., and B. T. Molloy. 1994. “Prediction of long term chloride concentration in concrete.” Mater. Struct. 27 (6): 338–346. https://doi.org/10.1007/BF02473426.
Martin-Perez, B., H. Zibara, R. D. Hooton, and M. D. A. Thomas. 2000. “A study of the effect of chloride binding on service life predictions.” Cem. Concr. Res. 30 (8): 1215–1223. https://doi.org/10.1016/S0008-8846(00)00339-2.
Midgley, H., and J. Illston. 1984. “The penetration of chlorides into hardened cement pastes.” Cem. Concr. Res. 14 (4): 546–558. https://doi.org/10.1016/0008-8846(84)90132-7.
Mindess, S., J. F. Young, and D. Darwin. 1981. Concrete, 481. Englewood Cliffs, NJ: Prentice-Hall.
Moon, H. Y., D. G. Shin, and D. S. Choi. 2007. “Evaluation of the durability of mortar and concrete applied with inorganic coating material and surface treatment system.” Constr. Build. Mater. 21 (2): 362–369. https://doi.org/10.1016/j.conbuildmat.2005.08.012.
Nielsen, E. P., and M. R. Geiker. 2003. “Chloride diffusion in partially saturated cementitious material.” Cem. Concr. Res. 33 (1): 133–138. https://doi.org/10.1016/S0008-8846(02)00939-0.
Saricimen, H., M. Maslehuddin, A. Iob, and O. A. Eid. 1996. “Evaluation of a surface coating in retarding reinforcement corrosion.” Constr. Build. Mater. 10 (7): 507–513. https://doi.org/10.1016/0950-0618(96)00013-X.
Song, H. W., H. B. Shim, A. Petcherdchoo, and S. K. Park. 2009. “Service life prediction of repaired concrete structures under chloride environment using finite difference method.” Cem. Concr. Compos. 31 (2): 120–127. https://doi.org/10.1016/j.cemconcomp.2008.11.002.
Swamy, R. N., and S. Tanikawa. 1993. “An external surface coating to protect concrete and steel from aggressive environments.” Mater. Struct. 26 (8): 465–478. https://doi.org/10.1007/BF02472806.
Tang, L. P., and J. Gulikers. 2007. “On the mathematics of time-dependent apparent chloride diffusion coefficient in concrete.” Cem. Concr. Res. 37 (4): 589–595. https://doi.org/10.1016/j.cemconres.2007.01.006.
Tang, L. P., and L. O. Nilsson. 1992. “Chloride diffusivity in high strength concrete at different ages.” In NORDIC concrete research. Oslo, Norway: Norsk Betongforening.
Tang, L. P., and L. O. Nilsson. 1993. “Chloride binding capacity and binding isotherms of OPC pastes and mortars.” Cem. Concr. Res. 23 (2): 247–253. https://doi.org/10.1016/0008-8846(93)90089-R.
Taylor, H. F. 1987. “A method for predicting alkazi ion concentrations in cement pore solutions.” Adv. Cem. Res. 1 (1): 5–17. https://doi.org/10.1680/adcr.1987.1.1.5.
Tennis, P. D., and H. M. Jennings. 2000. “A model for two types of calcium silicate hydrate in the microstructure of portland cement pastes.” Cem. Concr. Res. 30 (6): 855–863. https://doi.org/10.1016/S0008-8846(00)00257-X.
Thomas, M. D., and P. B. Bamforth. 1999. “Modelling chloride diffusion in concrete: Effect of fly ash and slag.” Cem. Concr. Res. 29 (4): 487–495. https://doi.org/10.1016/S0008-8846(98)00192-6.
Tuutti, K. 1982. Corrosion of steel in concrete. Vol. 20, 105–119. Stockholm, Sweden: Swedish Cement and Concrete Research Institute.
Van Breugel, K. 1991. Simulation of hydration and formation of structure in hardening cement-based materials. Delft, Netherlands: Delft Univ. of Technology.
Xi, Y. P., and Z. P. Bazant. 1999. “Modeling chloride penetration in saturated concrete.” J. Mater. Civ. Eng. 11 (1): 58–65. https://doi.org/10.1061/(ASCE)0899-1561(1999)11:1(58).
Yu, S., G. Sergi, and C. Page. 1993. “Ionic diffusion across an interface between chloride-free and chloride-containing cementitious materials.” Mag. Concr. Res. 45 (165): 257–261. https://doi.org/10.1680/macr.1993.45.165.257.
Zhang, J. Z., I. M. McLoughlin, and N. R. Buenfeld. 1998. “Modelling of chloride diffusion into surface-treated concrete.” Cem. Concr. Compos. 20 (4): 253–261. https://doi.org/10.1016/S0958-9465(98)00003-1.
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©2019 American Society of Civil Engineers.
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Received: Mar 15, 2018
Accepted: Nov 5, 2018
Published online: Mar 15, 2019
Published in print: May 1, 2019
Discussion open until: Aug 15, 2019
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