Behavior of Concrete Permeability Considering ITZ

Abstract:

In this paper, concrete was analyzed as a composite consisting of coarse aggregate, mortar matrix and interfacial transition zone (ITZ). Because permeability of each phase are not the same, ITZ will affect the concrete permeability. Effect of ITZ on the concrete permeability was studied by laboratory test and numerical analysis.The diffusion coefficient of ITZ, mortar,and concrete can be caculated by laboratory test. The results indicate that the diffusion coefficient of ITZ is far greater than mortar，which is about 40 times of mortar. The chloride ions diffusion ignoring ITZ and considering ITZ were simulated, the results show that the diffusion coefficient of concrete was bigger when the ITZ was considered, which was closer to the experimental results.

• Periodical: Advanced Materials Research (Volumes 287-290)
• Pages: 1091-1096
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.287-290.1091
• Online since: July 2011
• Authors: Ai Ping Yu, Hai Bo Lu, Yan Lin Zhao, Ke Yu Wei
• Keywords: Concrete, Diffusion Coefficient, Interfacial Transition Zone, Permeability

References

[1] Sidney Diamond, Jingdong Huang. The ITZ in concrete – a different view based on image analysis and SEM observations.Cement and Concrete Composites, 2001, 23( 2-3):179-188

DOI: 10.1016/s0958-9465(00)00065-2

[2] Jian-jun Zheng, Hong S. Wong, Nick R. Buenfeld Assessing the influence of ITZ on the steady-state chloride diffusivity of concrete using a numerical model[J]. Cement and Concrete Research, In Press, Corrected Proof, Available online 28 June (2009)

DOI: 10.1016/j.cemconres.2009.06.002

[3] C.T. Chiang, C.C. Yang. Relation between the diffusion characteristic of concrete from salt ponding test and accelerated chloride migration test[J]. Materials Chemistry and Physics, 2007,106 ( 2-3): 240-246

DOI: 10.1016/j.matchemphys.2007.05.041

[4] NADEAU J C. A multiscale model for effective moduliconcrete incorporating ITZ water-cement ratio gradient aggregate size distributions, and entrapped voids[J].Ceme and Concrete Research,2003,33(1):103-113.

DOI: 10.1016/s0008-8846(02)00931-6

[5] A. Delagrave, J.P. Bigas, J.P. OIlivier, etc. Influence of the Interfacial Zone on the Chloride Diffusivity of Mortars[J], Advn Cem Bas Mat ,1997(5): 86-92

DOI: 10.1016/s1065-7355(96)00008-9

[6] Mitsuru Saito.Minoru Ohta and Hiroshi Ishimori. Chloride permeability of concrete subjected to freeze-thaw damage[J]. Cement and Concrete Composites,1994,16(4):233-239

DOI: 10.1016/0958-9465(94)90035-3

[7] C.C. Yang. Effect of the percolated interfacial transition zone on the chloride migration coefficient of cement-based materials[J]. Materials Chemistry and Physics ，2005 (91)：538–544

DOI: 10.1016/j.matchemphys.2004.12.022