Experimental study of creep-damage coupling in concrete by acoustic emission technique

被引：57

作者：

Saliba, J. ^{[1
]}

Loukili, A. ^{[1
]}

Grondin, F. ^{[1
]}

Regoin, J. -P. ^{[1
]}

机构：

[1] LUNAM Univ, Inst Rech Genie Civil & Mecan GeM, CNRS, Ecole Cent Nantes,UMR 6183, Nantes, France

来源：

MATERIALS AND STRUCTURES | 2012年 / 45卷 / 09期

关键词：

Acoustic emission technique; Bending creep test; Concrete; Fracture process zone; FRACTURE PROCESS ZONE; HIGH-STRENGTH CONCRETE; MODEL CONCRETE; ENERGY; MICROCRACKING; BEHAVIOR; CRACK; SIZE; MECHANICS; SUBJECT;

D O I：

10.1617/s11527-012-9840-3

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

In order to design reliable concrete structures, prediction of long term behaviour of concrete is important by considering a coupling between creep and damage. An experimental investigation on the fracture properties of concrete beams submitted to creep bending tests with high levels of sustained load is reported. The influence of creep on the residual capacity and the fracture energy of concrete is studied. The progression of fracture is followed by the measurement of the crack mouth opening displacement during a three-point bending test. The sustained loading seems to increase the flexural strength of concrete, probably because of the consolidation of the hardened cement paste. The acoustic emission (AE) technique is used to perform the characterization of the influence of creep on the crack development. Results give wealth information on the fracture process zone (FPZ) and the propagation of the crack. A decrease in the amplitude distribution of AE hits is observed in the post-peak region for creep specimens. The width of the FPZ also decreases in this later indicating that the material has a more brittle behaviour which may be due to the development of microcracking under creep and the prestressing of the upper zone of the beam.

引用

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页码：1389 / 1401

页数：13

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