现代混凝土传输行为与其微结构之间关系的研究方法及其进展

doi:10.11896/j.issn.1005-023X.2018.17.014

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Abstract  Cracking is the main cause of premature deterioration and early withdrawal from service of structural concrete. The deterioration is mainly caused by the propagation of aggressive media through the pores of concrete itself, microcracks or cracks under load. Therefore, to reveal the essence of deterioration of modern concrete, its macroscopic and microscopic constitutive relations should be understood and established scientifically.
   In the past, the transport theory of aggressive media in concrete materials at home and abroad, like Fick’s or Darcy’s law, essentially belong to phenomenological theory. Although these theories can describe the phenomena of ion transport, the key parameters such as diffusion coefficients and permeability coefficients are obtained by experiments regression, and the physical meaning behind the phenomenon is not dug out. What’s more, it is difficult to determine the influence of the concrete microstructure at each scale on the transport of ions, not to mention the control of concrete microstructure from its root, and adjustment of the transport behaviors of the aggressive media. The modern concrete features porous, multi-phase, multi-level and multi-scale, therefore, it is necessary to establish the transport constitutive relationship of aggressive media on a scale-by-scale basis.
   The diffusion of chloride ions (one of the most important reasons of concrete deterioration caused by corrosion of steel bars) in modern concrete is taken as an example in this article. A series of domestic and foreign research findings are introduced, including the theoretical scheme for the transport constitutive relations between the macroscopic and the microscopic of the modern concrete, the main microstructure parameters (such as hydration products of hardened cement paste and its spatial distribution, the pore distribution and the volume fraction of the interfacial transition zone) influencing the transport behavior of chloride ions, as well as the established transport constitutive relations on chloride ion diffusion and the microstructure parameters of concrete at each scale.
   The existing transport models at each scale based on meso-mechanical theory, like self-consistent scheme, generalized self-consistent scheme, effective medium theories, assume that the inclusions are spherical and remain intact with the matrix. However, it must be taken into serious consideration that the influence of inclusion morphology, inclusion ratio and interfacial transition zone between inclusion and matrix on the transport behavior of complicated concrete composites. In the prediction model of concrete microstructure parameters, a volume fraction prediction model of interfacial transition zone around the spherical aggregate has been preli-minarily established and the overlap between interfaces has been fully taken into account. The pore structure distribution model of the interface transition zone, the simulation of hydration process for Portland cement and the volume fraction calculation model of hydration products are partially presented. In a word, these models lay a solid foundation for the establishment of transport constitutive relations between macroscopic and microscopic concrete.
   This article also systematically introduces the modeling process from the minimum scale, namely from the nano scale to the macro scale, which affect the ion transport. Finally, it points out the current deficiencies in the quantitative prediction of theoretical prediction model at each scale and microstructure parameters, and the focus of future study, aiming at providing some valuable ideas for the regulation of the microstructure of structural concrete and the prediction of the service life.

Key words： modern concrete microstructure multi-scale transport behavior chloride ions

Published: 19 September 2018

CLC number:

TU528

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	SUN Guowen
	SUN Wei
	WANG Caihui

Cite this article:

SUN Guowen,SUN Wei,WANG Caihui. Relationship Between the Transport Behavior of Modern Concrete and Its Microstructures: Research Methods and Progress[J]. Materials Reports, 2018, 32(17): 3010-3022.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.17.014 OR http://www.mater-rep.com/EN/Y2018/V32/I17/3010

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