scholarly journals Study on fracture toughness of chopped strand reinforced plastics in water environment by means of acoustic emission method.

1986 ◽  
Vol 35 (392) ◽  
pp. 527-532 ◽  
Author(s):  
Hideki SEKINE ◽  
Keiichi SHIMOMURA ◽  
Norio HAMANA
Keyword(s):  
Fracture Toughness ◽  
Acoustic Emission ◽  
Water Environment ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Reinforced Plastics

Use of the acoustic emission method for determination of the fracture toughness of ductile steels

1989 ◽  
Vol 21 (1) ◽  
pp. 33-38
Author(s):  
V. L. Volodin ◽  
Yu. D. Kon'kov ◽  
Yu. A. Alyushin
Keyword(s):  
Fracture Toughness ◽  
Acoustic Emission ◽  
Acoustic Emission Method ◽  
Emission Method

scholarly journals Monitoring of the Impact of Lithium Nitrate on the Alkali–aggregate Reaction Using Acoustic Emission Methods

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 20
Author(s):  
Justyna Zapała-Sławeta ◽  
Grzegorz Świt
Keyword(s):  
Acoustic Emission ◽  
Initial Reaction ◽  
Lithium Nitrate ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Acoustic Activity ◽  
Initial Stage ◽  
Chemical Admixture ◽  
Different Characteristics ◽  
The Impact

The study analyzed the possibility of using the acoustic emission method to analyse the reaction of alkali with aggregate in the presence of lithium nitrate. Lithium nitrate is a chemical admixture used to reduce adverse effects of corrosion. The tests were carried out using mortars with reactive opal aggregate, stored under the conditions defined by ASTM C227. The acoustic activity of mortars with a corrosion inhibitor was referred to linear changes and microstructure of specimens in the initial reaction stages. The study found a low acoustic activity of mortars with lithium nitrate. Analysis of characteristic parameters of acoustic emission signals, combined with the observation of changes in the microstructure, made it possible to describe the corrosion processes. As the reaction progressed, signals with different characteristics were recorded, indicating aggregate cracking at the initial stage of the reaction, followed by cracking of the cement paste. The results, which were referred to the acoustic activity of reference mortars, confirmed that the reaction of opal aggregate with alkali was mitigated in mortars with lithium nitrate, and the applied acoustic emission method enabled the detection and monitoring of ASR progress.

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