Monitoring of the mechanical behavior of concrete with chemically treated steel fibers by acoustic emission

被引：69

作者：

Aggelis, D. G. ^{[1
]}

Soulioti, D. V. ^{[2
]}

Gatselou, E. A. ^{[2
]}

Barkoula, N. -M. ^{[2
]}

Matikas, T. E. ^{[2
]}

机构：

[1] Vrije Univ Brussel, Dept Mech Mat & Construct, B-1050 Brussels, Belgium

[2] Univ Ioannina, Dept Mat Sci & Engn, GR-45110 Ioannina, Greece

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2013年 / 48卷

关键词：

Cement-based material; Fracture; Frequency; Passive monitoring; RA value; Toughness; DAMAGE CHARACTERIZATION; FRACTURE; CLASSIFICATION; INTERFACE; BOND;

D O I：

10.1016/j.conbuildmat.2012.06.066

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Inclusion of steel fibers is an effective way to increase the ductility of concrete. In order to achieve optimal mechanical properties and especially toughness, chemical treatment of the fibers is applied. Suitable. agents improve the bonding between the stiff fiber and matrix enabling more efficient stress transfer. In the present study specimens with plain and chemically treated steel fibers are subjected to four-point bending with concurrent monitoring of their acoustic emission (AE) activity. Specific AE parameters demonstrate that coating offers distinct characteristics to the interphase especially after the maximum load has been reached. Parameters like average frequency (AF) and the rise angle of the waveforms, which are used for cracking mode classification, indicate that the post peak behavior of specimens with chemically treated fibers is more closely related to matrix cracking, while untreated exhibit clear shear behavior due to pull-out. It is concluded that coating effectively contributes to the deflection of the cracks from the fiber-matrix interphase into the concrete matrix. AE analysis sheds light into the fracturing behavior of concrete in real time, in a way that is not possible by any other conventional measurement. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：1255 / 1260

页数：6

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