scholarly journals Acoustic Emission Analysis of Corroded Reinforced Concrete Columns under Compressive Loading

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2412 ◽  
Author(s):  
Qiang Li ◽  
Xianyu Jin ◽  
Dan Wu ◽  
Hailong Ye
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Failure Process ◽  
Compressive Loading ◽  
Reinforcement Corrosion ◽  
Emission Analysis ◽  
Rc Columns ◽  
Damage And Failure ◽  
Highly Active ◽  
Initial Stage

In this work, the failure process of non-corroded and corroded reinforced concrete (RC) columns under eccentric compressive loading is studied using the acoustic emission (AE) technique. The results show that reinforcement corrosion considerably affects the mechanical failure process of RC columns. The corrosion of reinforcement in RC columns leads to highly active AE signals at the initial stage of loading, in comparison to the non-corroded counterparts. Also, a continuous AE hit pattern with a higher number of cumulative hits is observed for corroded RC columns. The spatial distribution and evolution of AE events indicate that the reinforcement corrosion noticeably accelerates the initiation and propagation of cracking in the RC columns during compressive loading. The AE characteristics of corroded RC columns are in agreement with the macroscopic failure behaviors observed during the damage and failure process. A damage evolution model of corroded RC columns based on the AE parameters is proposed.

scholarly journals Acoustic Emission Study on the Damage Evolution of a Corroded Reinforced Concrete Column under Axial Loads

Crystals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 67
Author(s):  
Ye Chen ◽  
Shuang Zhu ◽  
Shenghua Ye ◽  
Yifeng Ling ◽  
Dan Wu ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Evolution Equation ◽  
Damage Evolution ◽  
Corrosion Damage ◽  
Reinforcement Corrosion ◽  
Axial Loads ◽  
Reinforced Concrete Column ◽  
Damage Evolution Equation ◽  
Rc Column

In this paper, the damage of a reinforced concrete (RC) column with various levels of reinforcement corrosion under axial loads is characterized using the acoustic emission (AE) technique. Based on the AE rate process theory, a modified damage evolution equation of RC associated with the axial load and different corrosion rates is proposed. The experimental results show that the measured AE signal parameters during the loading process are closely related to the damage evolution of the RC column as well as the reinforcement corrosion level. The proposed modified damage evolution equation enables dynamic analysis for the damage of corrosion on a RC column under axial loading for a further real-time quantitative evaluation of corrosion damage on reinforced concrete.

scholarly journals Acoustic Emission Spectroscopy: Applications in Geomaterials and Related Materials

2021 ◽  
Vol 11 (19) ◽  
pp. 8801
Author(s):  
Ekhard K. H. Salje ◽  
Xiang Jiang ◽  
Jack Eckstein ◽  
Lei Wang
Keyword(s):  
Acoustic Emission ◽  
Failure Process ◽  
Fast Response ◽  
Probability Density Distribution ◽  
Material Failure ◽  
Destructive Testing ◽  
Human Teeth ◽  
Emission Analysis ◽  
Emission Signal ◽  
Testing Technology

As a non-destructive testing technology with fast response and high resolution, acoustic emission is widely used in material monitoring. The material deforms under stress and releases elastic waves. The wave signals are received by piezoelectric sensors and converted into electrical signals for rapid storage and analysis. Although the acoustic emission signal is not the original stress signal inside the material, the typical statistical distributions of acoustic emission energy and waiting time between signals are not affected by signal conversion. In this review, we first introduce acoustic emission technology and its main parameters. Then, the relationship between the exponents of power law distributed AE signals and material failure state is reviewed. The change of distribution exponent reflects the transition of the material’s internal failure from a random and uncorrelated state to an interrelated state, and this change can act as an early warning of material failure. The failure process of materials is often not a single mechanism, and the interaction of multiple mechanisms can be reflected in the probability density distribution of the AE energy. A large number of examples, including acoustic emission analysis of biocemented geological materials, hydroxyapatite (human teeth), sandstone creep, granite, and sugar lumps are introduced. Finally, some supplementary discussions are made on the applicability of Båth’s law.

scholarly journals Effectiveness of Prolonged Air-Recuring on Strength of Fire Damaged RC Columns

2019 ◽  
Vol 5 (10) ◽  
pp. 2207-2220
Author(s):  
Muhammad Adeel Ehsan ◽  
Muhammad Yaqub ◽  
M. Uzair Khan ◽  
M. Umar Abdur rehman Amir ◽  
Iqrar Hussain
Keyword(s):  
Reinforced Concrete ◽  
Steel Wire ◽  
Compressive Loading ◽  
Single Layer ◽  
Wire Mesh ◽  
Rc Columns ◽  
Temperature Levels ◽  
Steel Wire Mesh ◽  
Original Strength ◽  
Cfrp Wrapping

In this study, the effect of post-fire prolonged air-recuring on the recovery of strength of reinforced concrete was investigated after exposing to elevated temperature levels varying from 300 ºC to 900 ºC. The main objective of the paper is to find the effectiveness of prolonged air-recuring on strength of fire damaged RC columns. In order to achieve this, a total of 24 reinforced concrete circular columns having size  200 1200 mm were casted and tested under compressive loading. Eighteen specimens were heated in an electric furnace such that six specimens at each temperature level i.e. 300ºC, 500 ºC and 900 ºC. After heating, specimens were allowed to cool down naturally at ambient temperature and then specimens were air-recured in open environment (high humidity) following by repairing of respective specimens with various confinement techniques. After post fire prolonged air-recuring, test results showed that decrease in axial compressive at all temperature levels was less compared to values reported in literature for corresponding temperatures. This confirms the recovery of microstructure and thus increase in strength of post heated reinforced concrete circular columns due to prolonged air-recuring. It has been observed that both the confinement techniques i.e.  single layer of CFRP only and epoxy injection, steel wire mesh filled with epoxy resin mortar along with CFRP wrapping restored the original strength or even more of air-recured post heated reinforced concrete circular columns compared to that of un-heated control specimens or even more. 

3-D Micromechanics Model for Progressive Failure Analysis of Laminated Cylindrical Composite Shell

2005 ◽  
Vol 297-300 ◽  
pp. 1113-1119 ◽  
Author(s):  
Zheng Zhao Liang ◽  
Chun An Tang ◽  
De Shen Zhao ◽  
Yong Bin Zhang ◽  
Tao Xu ◽  
...  
Keyword(s):  
Composite Shell ◽  
Progressive Failure ◽  
Failure Process ◽  
Compressive Loading ◽  
Three Dimensional ◽  
Constitutive Law ◽  
Numerical Code ◽  
Damage And Failure ◽  
Progressive Failure Analysis ◽  
Cylindrical Composite Shell

A newly developed numerical code MFPA3D is applied to simulate the progressive damage and failure process of laminated cylindrical composite shell. Heterogeneities in meso-scale are taken into account by randomly distributing the material properties throughout the model by following a Weibull statistical distribution. The cylindrical composite shell is discretized into 3-D block elements with the fixed size and is subjected to a lateral compressive loading, applied with a constant displacement control manner. The numerical simulation results show that not only the process of crack initiation, propagation and coalescence but also the failure process can be numerically obtained in three dimensional. The MFPA3D modeling demonstrates that the code can simulate non-linear behavior of brittle materials with a simple mesoscopic constitutive law with a strength and elastic modulus reduction of the weaken elements.

scholarly journals Study on Acoustic Emission Characteristics of a Semirigid Base of Dense Skeleton Type during Complete Uniaxial Compression Tests

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Shengli Li ◽  
Guangming Wu ◽  
Hao Wu
Keyword(s):  
Acoustic Emission ◽  
Uniaxial Compression ◽  
Growth Stage ◽  
Failure Process ◽  
Testing Machine ◽  
Compression Tests ◽  
Stage Of Development ◽  
General Terms ◽  
Initial Stage ◽  
Stable Growth

Acoustic emission testing of semirigid base specimens subjected to uniaxial compression was performed by a mechanical testing machine and AE system to find the AE criterion of the uniaxial compressive failure process of the semirigid base of dense skeleton types. AE counts, cumulative AE energy, andb-value were discussed. Results indicated that the AE parameters could reflect the failure process of semirigid bases of dense skeleton types. The failure process mainly underwent three stages that were divided based on AE parameters into initial stage of development, stable growth stage, and unstable stage. The knees of the AE parameter curve were at 25% and 85% of the ultimate load. The variation of theb-value could indicate the stress and be a precursor to the failure of the specimens. In general terms, ab-value greater than 3.5 indicates that specimens are at the initial stage of development. Ab-value between 1 and 2 indicates that the specimens are at the stable growth stage. If theb-value seems to fluctuate and increase, the specimens are at the unstable stage. Moreover, the AE parameters indicated that attaching sensors to the waist of specimens was superior to that at other locations of a specimen.

Temporal and Spatial Evolution of Acoustic Emission in the Damage Process of Reinforced Concrete Column

2014 ◽  
Vol 638-640 ◽  
pp. 275-278 ◽  
Author(s):  
Qiang Li ◽  
Zhong Gou Chen ◽  
Dan Wu
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Failure Process ◽  
Concrete Column ◽  
Spatial Evolution ◽  
Reinforced Concrete Column ◽  
Temporal And Spatial Evolution ◽  
Concrete Members ◽  
Damage Process ◽  
Temporal And Spatial

To study the whole process of fracture and damage of reinforced concrete column, temporal and spatial evolution of acoustic emission in the damage process of reinforced concrete column were tested. The results show that AE events of corroded column were much more during the whole loading process than that of the none-corroded one due to reinforcement corrosion. At the same loading speed, the corroded column was failed earlier than the none-corroded one. AE can obtain the internal temporal and spatial evolution damage parameters of the reinforced concrete members before the macro crack visible. The AE results were in well agreement with the brittle failure of both corroded and none-corroded columns. 3D location of AE events can directly reflect the fracture and failure process of reinforced concrete column but its accuracy needs further study.

In-Situ Observation and Acoustic Emission Analysis for Corrosion Pitting of MgCl2 Droplet in SUS304 Stainless Steel

2012 ◽  
Vol 53 (6) ◽  
pp. 1069-1074 ◽  
Author(s):  
Mitsuharu Shiwa ◽  
Hiroyuki Masuda ◽  
Hisashi Yamawaki ◽  
Kaita Ito ◽  
Manabu Enoki
Keyword(s):  
Stainless Steel ◽  
Acoustic Emission ◽  
Emission Analysis ◽  
Sus304 Stainless Steel ◽  
Corrosion Pitting ◽  
Acoustic Emission Analysis
Sign in / Sign up

Export Citation Format

Share Document