Experimental Study on Acoustic Emission Characteristics of Splitting Damage Processes for Different Ages of Concrete

2011 ◽  
Vol 105-107 ◽  
pp. 976-980
Author(s):  
Yan Wang ◽  
Sheng Xing Wu ◽  
Shuo Chen ◽  
Yao Wang ◽  
Bao Long Wei
Keyword(s):  
Acoustic Emission ◽  
Gradual Increase ◽  
Damage Mechanism ◽  
Strength Development ◽  
Early Age ◽  
Emission Characteristics ◽  
Related Research ◽  
Splitting Failure ◽  
Early Age Concrete ◽  
Damage Processes

A total of 18 specimens’ damage processes of concrete under split load in 1d, 3d, 5d, 7d, 14d and 28d ages are monitored by acoustic emission (AE) technique and corresponding typical AE characteristics are summarized. The results show that splitting tensile strength of concrete and the number of AE hits are both showing a gradual increase with the growth of age. During the process of splitting failure of concrete specimens in 14d and 28d, AE hits in higher duration and amplitude are collected, It shows that the older concretes tends to release more energy, at last, AE parameters which are in higher correlation with the development of mechanical properties for early age concrete are given. Related research conclusions can provide the foundation for the research of strength development and damage mechanism of early age concretes.

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.

Acoustic Emission Characteristics of Plain Concrete under Three-Point Bending

2014 ◽  
Vol 1030-1032 ◽  
pp. 974-977
Author(s):  
Yue Sheng Xu ◽  
Jiao Qu ◽  
Fan Lu ◽  
Lan Li ◽  
Xin Cheng ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Health Monitoring ◽  
Concrete Beams ◽  
Plain Concrete ◽  
Damage Mechanism ◽  
Embedded Sensors ◽  
Emission Characteristics ◽  
Three Point Bending ◽  
Acoustic Emission Technology

It is vital to use acoustic emission technology to study on health monitoring of concrete. The aim of this study is to investigate the ability of the AE in order to test the effect of the stepwise displacement load on the damage mechanism of the concrete beams that embedded sensors under three-point bending. The result showed that as the damage increased, amplitude and energy increased. At the same time, embedded sensors can locate the position of the crack.

Monitoring of concrete curing using the electromechanical impedance technique: review and path forward

2019 ◽  
pp. 147592171989306 ◽  
Author(s):  
Yee Yan Lim ◽  
Scott T Smith ◽  
Ricardo Vasquez Padilla ◽  
Chee Kiong Soh
Keyword(s):  
State Of The Art ◽  
Research Field ◽  
Strength Development ◽  
Early Age ◽  
Remote Monitoring System ◽  
Electromechanical Impedance ◽  
Wide Range ◽  
Impedance Technique ◽  
Technology Modeling ◽  
Early Age Concrete

The ability to monitor the strength development of early-age concrete is an important capability in the laboratory and in the field. Accurate and reliable in situ measurements can inform the appropriate time for removal of formwork and loading of structural elements, as well as determination of batch quality. The piezoelectric-based electromechanical impedance technique is emerging as a viable option for such monitoring needs. The first research articles on the topic started to appear in 2005, and since then, the research field has advanced and has grown in popularity. This article therefore presents the first state-of-the-art review of the topic to date. In this article, existing research is reviewed and sorted into key themes while critical developments as well as knowledge gaps are identified. The topics addressed range from miniaturization of hardware, methods of installation, incorporation of wireless technology, modeling, data interpretation, signal processing, influence of curing, and environmental conditions to a wide range of other practical issues. Previous studies have indicated that the electromechanical impedance technique has the potential to be developed into an autonomous and remote monitoring system, capable of predicting the strength development of early-age concrete structures in real time. An end game is therefore the realization of this capability. Appropriate comments are therefore also provided in this article about this goal. Researchers interested in venturing into this research area shall find this article a useful introduction as well as a state-of-the-art assessment. In addition, the identified research gaps can inform projects for more experienced research teams.

scholarly journals Acoustic Emission for Determining Early Age Concrete Damage as an Important Indicator of Concrete Quality/Condition before Loading

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3523 ◽  
Author(s):  
Wiesław Trąmpczyński ◽  
Barbara Goszczyńska ◽  
Magdalena Bacharz
Keyword(s):  
Acoustic Emission ◽  
Objective Assessment ◽  
Early Age ◽  
Hardened Concrete ◽  
Important Indicator ◽  
Curing Conditions ◽  
Damage Initiation ◽  
Detection And Identification ◽  
Concrete Damage ◽  
Early Age Concrete

Phenomena occurring during the curing of concrete can decrease its mechanical properties, specifically strength, and serviceability, even before it is placed. This is due to excessive stresses caused by temperature gradients, moisture changes, and chemical processes arising during the concreting and in hardened concrete. At stress concentration sites, microcracks form in the interfacial transition zones (ITZ) in the early phase and propagate deeper into the cement paste or to the surface of the element. Microcracks can contribute to the development of larger cracks, reduce the durability of structures, limit their serviceability, and, in rare cases, lead to their failure. It is thus important to search for a tool that allows objective assessment of damage initiation and development in concrete. Objectivity of the assessment lies in it being independent of the constituents and additives used in the concrete or of external influences. The acoustic emission-based method presented in this paper allows damage detection and identification in the early age concrete (before loading) for different concrete compositions, curing conditions, temperature variations, and in reinforced concrete. As such, this method is an objective and effective tool for damage processes detection.

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