Identification of active destructive processes in unloaded early-age concrete with the use of the acoustic emission method

2016 ◽  
Author(s):  
Magdalena Bacharz ◽  
Wieslaw Trampczynski
Keyword(s):  
Acoustic Emission ◽  
Early Age ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Destructive Processes ◽  
Early Age Concrete

scholarly journals Acoustic emission method as a tool for the assessment of influence of the temperature variation on destructive processes created in early age concrete

2019 ◽  
Vol 284 ◽  
pp. 07002 ◽  
Author(s):  
Magdalena Bacharz ◽  
Wiesław Trąmpczyński ◽  
Barbara Goszczyńska
Keyword(s):  
Acoustic Emission ◽  
Blast Furnace ◽  
Temperature Variation ◽  
Early Age ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Damage Process ◽  
Early Age Concrete ◽  
Damage Processes ◽  
Blast Furnace Cement

During the early age concrete treatment (curing and hardening) the damage process appears i.e., microcracks in the cement paste, propagation of internal microcracks, and formation of microcracks on the surface of concrete that affect concrete. It can be the serious source that initiate cracks that will propagate in the further loading stage, thereby affecting the overall strength and durability of structures. Hence, it is quite important to have a tool to identify the damage processes created up during the early age concrete treatment. The Identification of Active Damage Processes (IADP) acoustic emission method, modified to suit the tests on non-loaded concrete, was applied to determine and locate the damage processes that appears during the hardening conditions taking into account the temperature fluctuations on which construction structures are exposed (constant temperature of 22ºC or cyclic temperature variations in the range -5ºC/+42ºC) in non-loaded concrete produced with basalt aggregate and blast furnace cement. It is shown that the modified IADP method, can be used to assess the influence of the temperature variation on damage process in early age non-loaded concrete. As an example, concrete produced with basalt aggregate and blast furnace cement was used.

scholarly journals Monitoring early-age concrete with the acoustic-emission method and determining the change in the electrical properties

2015 ◽  
Vol 49 (5) ◽  
pp. 703-707
Author(s):  
Lubos Pazdera ◽  
Libor Topolar ◽  
Marta Korenska ◽  
Tomas Vymazal ◽  
Jaroslav Smutny ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Electrical Properties ◽  
Early Age ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Early Age Concrete

scholarly journals Acoustic emission for diagnosing cable way steel support towers

2019 ◽  
Vol 284 ◽  
pp. 09002
Author(s):  
Aleksandra Krampikowska ◽  
Grzegorz Świt
Keyword(s):  
Acoustic Emission ◽  
Image Analysis ◽  
Structural Damage ◽  
Corrosion Damage ◽  
Classification Method ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Damage Classification ◽  
Mathematical Processing ◽  
Destructive Processes

The paper reports results of the study on the possibility of using the acoustic emission method in diagnosing fatigue and corrosion damage in steel elements of the cable way support towers. The assessment of the sensitivity of the structure to the recorded destructive processes is based on the structural damage classification method using the patterns created as a result of statistical and mathematical processing of acoustic emission signals through image analysis and grouping methods.

scholarly journals Assessment of the technical condition of prefabricated elements using the acoustic emission method

2019 ◽  
Vol 28 (3) ◽  
pp. 356-365 ◽  
Author(s):  
Aleksandra Krampikowska ◽  
Anna Adamczak-Bugno
Keyword(s):  
Acoustic Emission ◽  
Prestressed Concrete ◽  
Technical Condition ◽  
Acoustic Emission Method ◽  
Material Degradation ◽  
Emission Method ◽  
Destructive Processes ◽  
Two Stages ◽  
The Impact ◽  
Concrete Elements

The article presents the results of tests using the acoustic emission method during the formation process of T-27 prestressed concrete beams. The studies included two stages. The first – testing the compressive strength of the cubic samples taken from the trial batch used for the production of beams together with the acquisition of acoustic emission signals. The second – measurements by acoustic emission, on the actual construction element during accelerated maturation of concrete caused by heating. The undertaking of the above subject results from the fact that this issue is of great importance when assessing the durability of reinforced concrete and pre-compressed elements in the aspect of the analysis of these structures in terms of durability. The impact of material degradation on the durability of the structure is difficult to appraise due to the lack of reliable results needed to estimate the durability of the selected statistical approach. However, the use of the acoustic emission method based on the identification of destructive processes creates the possibility of locating, identifying and monitoring the emerging and developing destructive processes affecting the durability of concrete elements.

scholarly journals Acoustic Emission Method for Locating and Identifying Active Destructive Processes in Operating Facilities

2018 ◽  
Vol 8 (8) ◽  
pp. 1295 ◽  
Author(s):  
Grzegorz Świt
Keyword(s):  
Acoustic Emission ◽  
Social Context ◽  
Structural Reliability ◽  
Life Assessment ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Entire Volume ◽  
Deterioration Process ◽  
Potential Damage ◽  
Destructive Processes

Durability, safety, and usability are the three foundations of structural reliability, vital in the economic and social context. As the locating and tracking of potential damage and evaluating its impact on the condition of the structure are part of service life assessment, relevant methods should be developed that would detect the onset of the deterioration process and enable the monitoring of its progress within the entire volume of the structure, not only in the areas selected in a subjective way. The acoustic emission (AE) method relying on the analysis of active destructive processes can be the best choice. This article reports the results of the application of the AE method for identifying active destructive processes and tracking their development during the routine operation of various types of structures.

Application Acoustic Emission Method and Impedance Spectroscopy for Monitoring Concrete During Hardening

2014 ◽  
Vol 1000 ◽  
pp. 257-260 ◽  
Author(s):  
Lubos Pazdera ◽  
Libor Topolář ◽  
Marta Kořenská ◽  
Jaroslav Smutny ◽  
Ivo Kusák ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Impedance Spectroscopy ◽  
Building Materials ◽  
Concrete Mixture ◽  
Early Age ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Destructive Methods

It is known that concrete is one of the most popular building materials nowadays. There are many traditional, mainly destructive methods for monitoring its properties during its lifetime. It is clear that its properties depend significantly on the composition of concrete mixture. Concrete lifetime depends mainly on curing during the first 7 days after making the mixture. The paper shows the possibilities of applying Acoustic Emission and Impedance Spectroscopy methods during the early age of concrete.

Applying Method of Acoustic Emission for Monitoring of Different Concrete Mixture during Setting and Hardening

2016 ◽  
Vol 249 ◽  
pp. 91-95 ◽  
Author(s):  
Libor Topolář ◽  
Petr Misák ◽  
Dalibor Kocáb ◽  
Michal Matysík
Keyword(s):  
Acoustic Emission ◽  
Concrete Structure ◽  
Early Age ◽  
Void Content ◽  
Building Structures ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Destructive Testing ◽  
Highly Active ◽  
Structure Changes

Non Destructive Testing is a powerful tool for determination of properties, durability and lifetime of concrete structures. Acoustic Emission Method is an unusual technique which describes only active defects or changes into structure arising as a consequence dangerous tension into structure. The method is appropriate to be used in homogenous structures as metal structures when cracks are highly active (generates sound). Its application in civil engineering is not so much used because building structures are inhomogeneous. This article shows possible application of Acoustic Emission Method for monitoring of concrete structure changes during its lifetime. The main aim of the article is to show the application of Acoustic Emission Method during the early age to 28 days after mixing. It is believed that early age of concrete structure is very important for its quality. Common concrete cube specimens have been tested after the production by Acoustic Emission Method with using waveguides. The results of acoustic emission method will be compared to classical parameters of fresh concrete e.g. the value water-cement ratio, air void content measured by different methods (pressure methods, AVA) and similar. In the results will be compared four mixtures when two mixtures were aerated and two mixtures were without aeration.

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