Experiment and Modeling of the Effect of Aggregate Shape on the Chloride Diffusivity of Concrete
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 9
Abstract
The purpose of this paper is to evaluate the effect of aggregate shape on the chloride diffusivity of concrete through laboratory experiments and theoretical analysis. In the experiment, three types of crystal glass spheroids with aspect ratios of 1, 2, and 3 are used as coarse aggregate. The experimental results show that the chloride diffusivity of concrete decreases with an increase in aggregate aspect ratio. When the coarse aggregate volume fraction is equal to 0.1, 0.2, and 0.3, the chloride diffusivity of concrete at an aggregate aspect ratio of 3 is, on average, smaller than that at an aggregate aspect ratio of 1 by 5.29%, 11.4%, and 19.6%, respectively. An analytical approximate is derived for the chloride diffusivity of concrete with spheroidal aggregates and verified with the experimental results. The analytical approximate can predict the chloride diffusivity with an average relative error of less than 8%.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The financial support from the National Natural Science Foundation with Grant No. 51379188 and the Natural Science Foundation of Zhejiang Province with Grant No. LY12E08022 of the People’s Republic of China is greatly acknowledged.
References
Bentz, D. P., Garboczi, E. J., Haeker, C. J., and Jensen, O. M. (1999). “Effects of cement particle size distribution on performance properties of portland cement-based materials.” Cem. Concr. Res., 29(10), 1663–1671.
Caŕe, S. (2003). “Influence of aggregate on chloride diffusion coefficient into mortar.” Cem. Concr. Res., 33(7), 1021–1028.
Caré, S., and Hervé, E. (2004). “Application of a n-phase model to the diffusion coefficient of chloride in mortar.” Transport Porous Med., 56(2), 119–135.
Delagrave, A., Bigas, J. P., Ollivier, J. P., Marchand, J., and Pigeon, M. (1997). “Influence of the interfacial zone on the chloride diffusion of mortars.” Adv. Cem. Based Mater., 5(3–4), 86–92.
Duan, H. L., Karihaloo, B. L., Wang, J., Yi, X. (2006). “Effective conductivities of heterogeneous media containing multiple inclusions with various spatial distributions.” Phys. Rev. B, 73(17), 174203 (1–13).
Garboczi, E. J., and Bentz, D. P. (1997). “Analytical formulas for interfacial transition zone properties.” Adv. Cem. Based Mater., 6(3), 99–108.
Garboczi, E. J., and Berryman, J. G. (2000). “New effective medium theory for the diffusivity or conductivity of a multi-scale concrete microstructure model.” Concr. Sci. Eng., 2(6), 88–96.
Garboczi, E. J., Schwartz, L. M., and Bentz, D. P. (1995). “Modeling the influence of the interfacial zone on the DC electrical conductivity of mortar.” Adv. Cem. Based Mater., 2(5), 169–181.
Koelman, J. M. V. A., and de Kuijper, A. (1997). “An effective medium model for the electric conductivity of an N-component anisotropic and percolating mixture.” Physica A, 247(1–4), 10–22.
Lu, X. Y. (1997). “Application of the Nernst-Einstein equation to concrete.” Cem. Concr. Res., 27(2), 293–302.
Ordonez-Miranda, J., and Alvarado-Gil, J. J. (2012). “Effect of the pore shape on the thermal conductivity of porous media.” J. Mater. Sci., 47(18), 6733–6740.
Torquato, S. (2001). Random heterogeneous materials: Microstructure and macroscopic properties, Springer, New York.
Yang, C. C., and Su, J. K. (2002). “Approximate migration coefficient of interfacial transition zone and the effect of aggregate content on the migration coefficient of mortar.” Cem. Concr. Res., 32(10), 1559–1565.
Zheng, J. J., Guo, Z. Q., Pan, X. D., Stroeven, P., and Sluys, L. J. (2011). “ITZ volume fraction in concrete with spheroidal aggregate particles and application: Part I. Numerical algorithm.” Mag. Concr. Res., 63(7), 473–482.
Zheng, J. J., Li, C. Q., and Zhou, X. Z. (2005). “Thickness of interfacial transition zone and cement content profiles around aggregates.” Mag. Concr. Res., 57(7), 397–406.
Zheng, J. J., Wong, H. S., and Buenfeld, N. R. (2009). “Assessing the influence of ITZ on the steady-state chloride diffusivity of concrete using a numerical model.” Cem. Concr. Res., 39(9), 805–813.
Zheng, J. J., and Zhou, X. Z. (2007). “Percolation of ITZs in concrete and effects of attributing factors.” J. Mater. Civ. Eng., 784–790.
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 9 • September 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 7, 2013
Accepted: Aug 27, 2013
Published online: Aug 29, 2013
Published in print: Sep 1, 2014
Discussion open until: Oct 12, 2014
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.