ACOUSTIC EMISSION BEHAVIOUR OF OVER-REINFORCED CONCRETE BEAMS

2019 ◽  
pp. 4-12 ◽  
Author(s):  
V. V. Bardakov ◽  
A. I. Sagaydak ◽  
S. V. Elizarov
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Cyclic Load ◽  
Concrete Beams ◽  
Experimental Studies ◽  
Reinforced Concrete Beams ◽  
Emission Data ◽  
Point Bend ◽  
Destructive Processes ◽  
The Relationship

The paper presents the results of the conducted experimental studies on three-point bend testing of over-reinforced concrete beams with incremental cyclic load, up to destruction, using the acoustic emission method. In total 3 RC beams differ from each other in reinforcement type, concrete composition and ultimate load were tested. Special attention is paid to the investigation of the relationship between destructive processes occurring during the testing of reinforced concrete beams and the evolution of acoustic emission data registered during the test. The analysis described in the article makes it possible, on the basis of acoustic emission data, recorded during the tests, to distinguish the stages corresponding to the different technical state of over-reinforced concrete structures.

Assessment of corroded reinforced concrete beams: Cyclic load test and acoustic emission techniques

2020 ◽  
Vol 233 ◽  
pp. 117291
Author(s):  
K.A. Shahid ◽  
N. Muhammad Bunnori ◽  
M.A. Megat Johari ◽  
Mohd H. Hassan ◽  
Ashiru Sani
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Cyclic Load ◽  
Concrete Beams ◽  
Load Test ◽  
Reinforced Concrete Beams

Classification of Damage Mode of Reinforced Concrete Beams Using Acoustic Emission Technique

2012 ◽  
Vol 626 ◽  
pp. 953-957 ◽  
Author(s):  
Md Noor Noorsuhada ◽  
Ibrahim Azmi ◽  
Norazura Muhamad Bunnori ◽  
Mat Saliah Soffian Noor ◽  
Mohd Saman Hamidah ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Shear Crack ◽  
Reinforced Concrete Beams ◽  
Damage Mode ◽  
Rc Beams ◽  
Static Test ◽  
The Relationship

Classification of damage modes in reinforced concrete (RC) beams was studied. Acoustic emission (AE) monitoring in conjunction with static test was applied on RC beams. The damage modes were classified by based on the load-deflection curve, the relationship between load and damage modes and the intensity analysis. It can be concluded that six damage modes were identified; namely micro-cracking, localized crack propagation, flexural crack distribution, shear crack formation, damage localization and failure of the beam. The use of intensity chart clearly estimates the zones of the damage mode of the reinforced concrete beams.

STANDARDS FOR THE TECHNICAL STATE TESTING OF REINFORCED CONCRETE STRUCTURES BY MEANS OF ACOUSTIC EMISSION METHOD

2020 ◽  
pp. 32-39
Author(s):  
A. I. Sagaydak ◽  
V. V. Bardakov ◽  
S. V. Elizarov ◽  
V. I. Ivanov
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Concrete Strength ◽  
Experimental Studies ◽  
Test Method ◽  
Reinforced Concrete Beams ◽  
Damage Degree ◽  
Emission Testing ◽  
Acoustic Emission Testing

The review of 3 standards in the field of concrete and reinforced concrete acoustic emission testing, developed and issued by International Organization for Standardization in 2019 is provided in the article. The first standard describes the process of acoustic emission signals measuring in concrete and reinforced concrete. The second standard describes test method for damage qualification of reinforced concrete beams. This standard allows dividing the damage degree of reinforced concrete beams into 3 groups: minor, intermediate, heavy. The third standard describes method for active cracks classification in concrete. This standard allows dividing growing cracks into 2 types: tensile cracks and other crack types (shear). Experimental studies on the correctness assessment of these standards by reinforced concrete beams three-point bending testing with incremental cyclic load were carried out. In total 5 RC beams of heavy concrete with different concrete strength and reinforcing type were tested. Based on the testing results the correctness of the criteria and methods presented in the standards was confirmed.

ACOUSTIC EMISSION SiGMA ANALYSIS ON SHEAR COMPRESSION FAILURE IN REINFORCED CONCRETE BEAMS

2008 ◽  
Vol 64 (1) ◽  
pp. 72-81
Author(s):  
Kentaro OHNO ◽  
Shinichiro SHIMOZONO ◽  
Yosuke SAWADA ◽  
Masayasu OHTSU
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Compression Failure

Application of acoustic emission monitoring for assessment of bond performance of corroded reinforced concrete beams

2016 ◽  
Vol 16 (6) ◽  
pp. 732-744 ◽  
Author(s):  
Ahmed A Abouhussien ◽  
Assem AA Hassan
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Signal Strength ◽  
Point Load ◽  
Reinforced Concrete Beams ◽  
Bond Failure ◽  
Acoustic Emission Monitoring ◽  
Bond Performance ◽  
Emission Monitoring

This article presents the results of an experimental investigation on the application of acoustic emission monitoring for the evaluation of bond behaviour of deteriorated reinforced concrete beams. Five reinforced concrete beam–anchorage specimens designed to undergo bond failure were exposed to corrosion at one of the anchorage zones by accelerated corrosion. Two additional beams without exposure to corrosion were included as reference specimens. The corroded beams were subjected to four variable periods of corrosion, leading to four levels of steel mass loss (5%, 10%, 20% and 30%). After these corrosion periods, all seven beams were tested to assess their bond performance using a four-point load setup. The beams were continuously monitored by attached acoustic emission sensors throughout the four-point load test until bond failure. The analysis of acquired acoustic emission signals from bond testing was performed to detect early stages of bond damage. Further analysis was executed on signal strength of acoustic emission signals, which used cumulative signal strength, historic index ( H( t)) and severity ( Sr) to characterize the bond degradation in all beams. This analysis allowed early identification of three stages of damage, namely, first crack, initial slip and anchorage cracking, before their visual observation, irrespective of corrosion level or sensor location. Higher corrosion levels yielded significant reduction in both bond strength and corresponding acoustic emission parameters. The results of acoustic emission parameters ( H( t) and Sr) enabled the development of a damage classification chart to identify different stages of bond deterioration.

scholarly journals EXPERIMENTAL STUDIES OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH STEEL FIBER JACKET

2020 ◽  
pp. 34-45
Author(s):  
O. Radaikin ◽  
L. Sharafutdinov
Keyword(s):  
Reinforced Concrete ◽  
Steel Fiber ◽  
Concrete Beams ◽  
Experimental Studies ◽  
Breaking Load ◽  
Fiber Reinforced Concrete ◽  
Reinforced Concrete Beams ◽  
Steel Fiber Reinforced Concrete ◽  
Joint Work ◽  
Loaded Crack

The purpose of the study is to experimentally study the joint work of steel fiber reinforced concrete (SFB) reinforcement jacket and reinforced concrete beams at all stages of loading to further develop a methodology for calculating this method of reinforcing bending elements. The main results of the study consist in assessing the strength, stiffness, fracture toughness, as well as the nature of fracture with a picture of the development of cracks for the examined 4 samples (two with a jacket of reinforcement, two - control - without reinforcement). It has been established that the use of SFB jacket with a thickness of 45 mm and with a fiber content percentage of 2,5% (at a flow rate of 196 kg/m3) increases the breaking load by 20 %, stiffness from 3,4 to 11 times as it is loaded, crack resistance 2,4-2,8 times. The results are compared with computer modeling in ANSYS PC: the discrepancy in the load of crack formation, fracture and deflection values for full-scale samples and a computer model are within 6,3 %, which indicates the reliability of the numerical results and the possibility of using the proposed computer models in further studies on topic of the article.

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