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

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

139
views

0
downloads

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

Suggestions

OpenMETU
Core

Effect of coarse aggregate size and matrix quality on ITZ and failure behavior of concrete under uniaxial compression Akcaoglu, T; Tokyay, Mustafa; Celik, T (2004-08-01) Effects of coarse aggregate size and water/cement (w/c) ratio of the matrix on the formation of interfacial transition zone (ITZ) and subsequently on the failure process of concrete under uniaxial compression were studied. For this purpose, a series of experiments were designed and carried out on mortars with two different w/c ratios containing single spherical steel aggregates of different sizes. The ITZ properties and the failure process of concrete were investigated through tensile strength tests both be...
Analysis of various polarization asymmetries in the inclusive b -> s a"" (+) a"" (-) decay in the fourth-generation standard model BASHIRY, VALİ; Bayar, M. (Springer Science and Business Media LLC, 2009-06-01) In this study a systematical analysis of various polarization asymmetries in inclusive b -> s a"" (+) a"" (-) decay in the standard model (SM) with four generation of quarks is carried out. We found that the various asymmetries are sensitive to the new mixing and quark masses for both of the mu and tau channels. Sizable deviations from the SM values are obtained. Hence, b -> s a"" (+) a"" (-) decay is a valuable tool for searching physics beyond the SM, especially in the indirect searches for the fourth-gen...
Measurement of jet multiplicity distributions in t(t)over-bar production in pp collisions at root s=7TeV Chatrchyan, S.; et. al. (Springer Science and Business Media LLC, 2014-08-01) The normalised differential top quark-antiquark production cross section is measured as a function of the jet multiplicity in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC with the CMS detector. The measurement is performed in both the dilepton and lepton+jets decay channels using data corresponding to an integrated luminosity of 5.0 fb(-1). Using a procedure to associate jets to decay products of the top quarks, the differential cross section of the t (t) over bar production is de...
Effect of coarse aggregate size on interfacial cracking under uniaxial compression Akcaoglu, T; Tokyay, Mustafa; Celik, T (2002-12-01) The effects of aggregate type and size are important parameters in the formation of interfacial transition zone (ITZ) structure and subsequently in the failure process of concrete. The influence of surface, rigidity and size of aggregates and water/cement (w/c) ratio of the matrix on bond strength at the ITZ and the interrelationship between the bond and the matrix in the failure process of concrete under uniaxial compression were studied. For this purpose a series of experiments were designed and carried o...
A theoretical study on nitrourea and its tautomers Türker, Burhan Lemi; Gumus, Selcuk; Atalar, Taner; Atlanel, Sencer (Informa UK Limited, 2008-01-01) In the present study, nitrourea and its possible tautomers have been subjected to theoretical analysis by performing Hartree-Fock and also density functional theory (DFT) calculations. The optimized geometries, vibrational frequencies, and some thermodynamical values for the presently considered species have been obtained in their ground states.

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.