The Effect of Interfacial Cracks on the Concrete Chloride Diffusion Coefficient Considering Aggregate Shape

Abstract:

Considering the concrete as a three-phase composite material composed of aggregate, interface and cement matrix, an octagon unit cell is constructed based on ellipse, and the numerical solution of concrete chloride diffusion coefficient considering the aggregate shape is obtained using the finite element method. The validity of the proposed algorithm is preliminary verified after compared with the available test results, and the effect of interfacial crack opening angle and aggregate shape on the concrete chloride diffusion coefficient is quantitatively evaluated. Through numerical calculation, it is found that the chloride diffusion coefficient of concrete increases with the increase of interfacial crack opening angle and decreases with the increase of aggregate shape coefficient.

• Periodical: Applied Mechanics and Materials (Volumes 275-277)
• Pages: 1239-1242
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.275-277.1239
• Online since: January 2013
• Authors: Guo Jun Peng, Chen Jie Chen
• Keywords: Chloride, Diffusion Coefficient, Interfacial Crack, Numerical Method

References

[1] Delagrave A, Bigas JP, Ollivier JP, et al. Influence of the interfacial zone on the chloride diffusivity of mortars[J]. Advanced Cement Based Materials, 1997, 5(3, 4): 86-92.

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

[2] Yang Zhong-jia, Su Jin-jiang. Approximate migration coefficient of interfacial transition zone and the effect of the aggregate content on the migration coefficient of mortar[J]. Cement and Concrete Research, 2002, 32(10): 1559-1565.

DOI: 10.1016/s0008-8846(02)00832-3

[3] Breton D, Ballivy G. Correlation between the transport properties of the transition zone and its mineral composition and microstructure[A]. The modelling of microstructure and its potential for studying Transport Properties and Durability[C]. Dordrecht: Kluwer Academic Publisher, 1994. 361-372.

DOI: 10.1007/978-94-015-8646-7_19

[4] Pivonka P, Hellmich C, Smith D. Microscopic effects on chloride diffusivity of cement pastes-a scale transition analysis[J]. Cement and Concrete Research, 2004, 34(12): 2251-2260.

DOI: 10.1016/j.cemconres.2004.04.010

[5] Zheng Jianjun, Zhou Xinzhu. Prediction of the chloride diffusion coefficient of concrete[J]. Materials and Structures, 2007, 40(7): 693-701.

[6] Chen Xiaorong, Mao Kefeng, Zheng Jianjun. Effect of interfacial cracks on chloride diffusion coefficient of concrete[J]. Advances in Science and Technology of Water Resources, 2007, 27(4): 30-33(in Chinese).

[7] Zheng Jianjun, Li Chunqing. Three-dimensional aggregate density in concrete with wall effect[J]. ACI Materials Journal, 2002, 99(6): 568-575.

[8] Peng Guojun, Zheng Jianjun, Zhou Yingqiong. A numerical method for predicting the chloride diffusion coefficient of concrete with aggregate shape[J]. Advances in Science and Technology of Water Resources, 2009, 29(6): 13-16(in Chinese).

[9] Wang LB, Wang XR, Mohammad L, et al. Unified method to quantify aggregate shape angularity and texture using Fourier analysis[J]. Journal of Materials in Civil Engineering, 2005, 17(5): 498-504.

DOI: 10.1061/(asce)0899-1561(2005)17:5(498)