Assessing the ITZ microcracking via scanning electron microscope and its effect on the failure behavior of concrete

Date

2005-02-01

Author

Akcaoglu, R
Tokyay, Mustafa
Celik, T

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The influence of aggregate size and water-to-cement (w/c) ratio of the matrix on the structure of interfacial transition zone (ITZ) and the interaction between the ITZ and the matrix on the failure process of concrete under uniaxial compression were studied. The ITZ microcracking and the failure process of concrete were investigated experimentally by means of compressive and indirect tensile testing, stress-volumetric strain measurements and microscopic analyses on the model concrete containing single spherical steel aggregate with three different w/c ratios. At low w/c ratios, the rigid and smooth surface texture aggregates made by the ITZ have a significant structural difference compared to the mortar. This was more pronounced for larger aggregates. Higher structural differences between the mortar matrix and ITZ in low w/c ratio composites resulted in accelerated ITZ microcracking at high stress level. The effect of condensed microcracking in a narrower ITZ was reflected in the lower critical stress levels for the low w/c ratio composites with larger aggregates.

Subject Keywords

Aggregate, Interfacial transition zone, Tensile properties, Microcracking

URI

https://hdl.handle.net/11511/30181

Journal

CEMENT AND CONCRETE RESEARCH

DOI

https://doi.org/10.1016/j.cemconres.2004.05.042

Collections

Graduate School of Natural and Applied Sciences, Article

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Citation Formats

R. Akcaoglu, M. Tokyay, and T. Celik, “Assessing the ITZ microcracking via scanning electron microscope and its effect on the failure behavior of concrete,” CEMENT AND CONCRETE RESEARCH, pp. 358–363, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30181.