Quantitative analysis and affecting factors of the overlapping degree of interfacial transition zone between neighboring aggregates in concrete

Abstract

Based on the nearest surface function formula, a quantitative formula to measure the overlapping degree between the interfacial transition zone (ITZ) of neighboring aggregate particles was put forward. The formula was further deduced to quantitatively analyze the influence of the volume fraction of aggregate, ITZ thickness and the maximum aggregate diameter on the overlapping degree between neighboring ITZ. The volume of ITZ was quantitatively calculated in actual concrete by comparing the nearest surface function formula with an approximate method, that is the surface area of the aggregates multiplied by the uniform thickness of the ITZ layers. The results showed that the influencing order of these three factors on the overlapping degree between neighboring ITZ in turn was the interface thickness, aggregate volume fraction and the maximum aggregate diameter; As long as the interface thickness <50 μm and the aggregate volume fraction <50%, the calculated error between two methods mentioned above is about 10 %.

Keywords

concrete / interfacial transition zone / degree of overlapping / volume fraction / 发 Fuller distribution

References

[1] Diamond S., Mindess S. SEM Investigations of Fracture Surfaces Using Stereo Pairs: III Fracture Surfaces of Mortars[J]. Cement and Concrete Research, 1994, 24(6): 1 140-1 152.

[2] Scrivener K. L., Bentur A., Pratt P. L. Quantitative Characterization of the Transition Zone in High-Strength Concretes[J]. Advances in Cement Research, 1988, 1(4): 230-237.

[3] Sugama T., Carciello N., Kukacka L.E., . Interface between Zinc Phosphate-Deposited Steel Fibres and Cement Paste[J]. Journal of Materials Science, 1992, 27(11): 2 863-2 872.

[4] Raivio P., Sarvaranta L. Microstructure of Fibre Mortar Composites under Fire Impact-Effect of Polypropylene and Polyacrylonitrile Fibers[J]. Cement and Concrete Research, 1994, 24(5): 896-906.

[5] Bourdette B., Ringot E., Ollivier J. P. Modelling of the Transition Zone Porosity[J]. Cement and Concrete Research, 1995, 25(4): 741-751.

[6] Ye G. Percolation of Capillary Pores in Hardening Cement Pastes[J]. Cement and Concrete Research, 2005, 35(1): 167-176.

[7] Gao J. M., Qian C. X., Liu H. F., . ITZ Microstructure of Concrete Containing GGBS[J]. Cement and Concrete Research, 2005, 35(7): 1 299-1 304.

[8] Garboczi E. J., Bentz D. P. Digital Simulation of the Aggregate-Cement Paste Interfacial Zone in Concrete[J]. Journal of Materials Research, 1991, 6(1): 196-201.

[9] Garboczi E. J. Computational Materials Science of Cement-Based Materials[J]. Materials and Structures, 1993, 26(4): 191-195.

[10] Scrivener K. L., Nemati K. M. The Percolation of Pore Space in the Cement Paste/Aggregate Interfacial Zone[J]. Cement and Concrete Research, 1996, 26(1): 35-40.

[11] Garboczi E. J., Bentz D. P. Multiscale Analytical /Numerical Theory of the Diffusivity of Concrete[J]. Advanced Cement Based Materials, 1998, 8(2): 77-88.

[12] Garboczi E. J., Schwartz L. M., Bentz D. P. Modeling the Influence of the Interfacial Zone on the DC Electrical Conductivity of Mortar[J]. Advanced Cement Based Materials, 1995, 2(5): 169-181.

[13] Garboczi E. J., Bentz D. P. Modelling of the Microstructure and Transport Properties of Concrete[J]. Constr. Build. Mater., 1996, 10(5): 293-300.

[14] Yang C. C., Su J. K. Approximate Migration Coefficient of Interfacial Transition Zone and the Effect of Aggregate Content on the Migration Coefficient of Mortar[J]. Cement and Concrete Research, 2002, 32(10): 1 559-1 565.

[15] Caré S. Influence of Aggregates on Chloride Diffusion Coefficient into Mortar[J]. Cement and Concrete Research, 2003, 33(7): 1 021-1 028.

[16] Caré S., Hervé E. Application of a N-phase Model to the Diffusion Coefficient of Chloride in Mortar[J]. Transp in Porous Media, 2004, 56(2): 119-135.

[17] Delagrave A., Bigas J. P., Olivier J. P. Influence of the Interfacial Zone on the Chloride Diffusivity of Mortars[J]. Advanced Cement Based Materials, 1997, 5(3–4): 86-92.

[18] Garboczi E. J., Berryman J. G. Elastic Moduli of a Material Containing Composite Inclusions: Effective Medium Theory and Finite Element Computations[J]. Mechanics of Materials, 2001, 33(8): 455-470.

[19] Sun Z. H., Garboczi E. J., Shah S. P. Modeling the Elastic Properties of Concrete Composites: Experiment, Differential Effective Medium Theory and Numerical Simulation[J]. Cement and Concrete Composites, 2007, 29(1): 22-38.

[20] Zheng J. J., Zhou X. Z. Percolation of ITZ in Concrete and Effects of Attributing Factors[J]. Journal of Materials in Civil Engineering, 2007, 19(9): 784-790.

[21] Lu B. L., Torquato S. Nearest Surface Distribution Functions for Polydispersed Particle Systems[J]. Phys. Rev. A, 1992, 45(8): 5 530-5 544.

[22] Zheng J. J., Zhou X. Z. Prediction of the Chloride Diffusion Coefficient of Concrete[J]. Materials and Structures, 2007, 40(7): 693-701.