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http://dx.doi.org/10.4334/JKCI.2009.21.4.457

Quantitative Damage Evaluation of Fiber-Reinforced Cement Composite Using Acoustic Emission Technique  

Lee, Young-Oh (Dept. of Architectural Engineering, Chungnam National University)
Yun, Yeo-Jin (Dept. of Civil System Engineering, Konyang University)
Yun, Hyun-Do (Dept. of Architectural Engineering, Chungnam National University)
Publication Information
Journal of the Korea Concrete Institute / v.21, no.4, 2009 , pp. 457-464 More about this Journal
Abstract
Fiber is an important ingredient in fiber-reinforced cement composite (FRCC) which can control fracture of cement composite by bridging action. In compliance with the action of the fiber and the aggregate size, it also showed a different failure mechanism. For practical application, it is needed to investigate the fracture behavior of the FRCC and to understand the micro-mechanism of cement matrix with reinforcing fiber. In order to evaluate a characteristics of fracture process in the FRCC, acoustic emission (AE) technique was used for the analysis and evaluation of FRCC damage by acoustic emission under flexural and cyclic compressive loadings. The AE signals were monitored by AMSY4 AE instrument during the entire loading period. The specimens are reinforced with 0, 1.0, 1.5 and 2.0% (by volume) Polyvinyl alcohol (PVA) fiber. The test results showed that the damage progress of the FRCC was characteristic for the fiber replacement ratio. As a result of analyzing the felicity ratio (FR) values, it is shown that this values can be used for evaluating the degree of FRCC damage. On the whole the felicity ratio values of FRCC are shown between 0.4 and 1.1. And, the AE kaiser effect was shown in the all FRCC specimen. In addition, the damage behavior and the microscopic fracture process of the FRCC are evaluated using the AE parameters, such as calm ratio, b-value and felicity ratio. The purpose of this reserch was to advance the state of knowledge regarding the applicability of acoustic emission as an evaluation method for FRCC.
Keywords
fiber-reinforced cement composite; bridging action; Kaiser effect; calm ratio; b-value;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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