EVALUATION OF FRACTURE IN CONCRETE WITH RECYCLED AGGREGATE BY ACOUSTIC EMISSION

2006 ◽  
Vol 20 (25n27) ◽  
pp. 3652-3657
Author(s):  
SAYAKA NISHIBATA ◽  
TAKESHI WATANABE ◽  
CHIKANORI HASHIMORO ◽  
KIYOSHI KOHNO
Keyword(s):  
Acoustic Emission ◽  
Fracture Behavior ◽  
Average Frequency ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Repeated Loading ◽  
Uniaxial Compression Test ◽  
Adhesion Properties ◽  
Propagation Of Elastic Waves ◽  
Non Destructive

This research revealed fracture behavior of concrete in using recycled aggregates by Acoustic Emission as one of the Non-destructive Inspection. The phenomenon of acoustic emission (AE) is the propagation of elastic waves generated from a source, known as a micro-crack in an elastic material. There were taken to use low-treated recycled aggregate, crushed returned ready mixed concrete for aggregate and normal aggregate. Examination measured AE under the uniaxial compression test. The condition of load is repeated loading. As a result, fracture behavior due to low treated recycled aggregate was detected by AE. It is clarified that AE of concrete with low treated recycled aggregate appeared in low stress level. It has been understood that difference of aggregates becomes clear from Kaiser effect in repeated loading. In relation between RA value and average frequency, it has been understood the adhesion properties of the cement paste in recycled aggregate are appreciable.

scholarly journals Mechanical Properties and Crack Classification of Basalt Fiber RPC Based on Acoustic Emission Parameters

2019 ◽  
Vol 9 (18) ◽  
pp. 3931 ◽  
Author(s):  
Hanbing Liu ◽  
Shiqi Liu ◽  
Peilei Zhou ◽  
Yuwei Zhang ◽  
Yubo Jiao
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Univariate Analysis ◽  
Basalt Fiber ◽  
Average Frequency ◽  
Fiber Content ◽  
Reactive Powder ◽  
Non Destructive

The workability and mechanical properties of basalt fiber reactive powder concrete (BFRPC) were investigated by univariate analysis. The acoustic emission (AE) was used as a non-destructive technique to reveal the damage characterization of concrete samples of varying basalt fiber content. The fracture stages and modes of specimens during flexural test were determined by AE parameters. The content of silica fume, quartz sand and basalt fiber of 0.4, 1.3 and 10 kg/m3, respectively, was found related to optimal improvements in mechanical strength. As for the characteristics of fracture, it was found that the fiber content was a significant determinant, and the key AE parameters, namely, hits, energy and amplitude, were found related to the damage stage of specimens. Furthermore, rise time (RA) and average frequency (AF) were found to have opposite trends during loading while their variation related to the fracture modes of BFRPC.

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