Acoustic Emission Parameter Calibration and Source Localization Accuracy in Steel Fiber Reinforced Concrete

doi:10.16552/j.cnki.issn1001-1625.2025.0873

Abstract

Abstract:

A systematic experimental study was conducted to address the issues of parameter calibration and insufficient source localization accuracy in acoustic emission （AE） testing of steel fiber reinforced concrete （SFRC）. Three types of steel fiber—end-hook type， shear type， and corrugated type—were incorporated into specimens at volume fractions of 0%， 0.5%， 1.0%， and 1.5%， followed by pencil lead break tests and loading AE tests. The results show that under identical conditions such as water-cement ratio， the steel fiber content significantly influences AE sound velocity and signal rise time： for every 0.5 percentage points increase in steel fiber content， the average sound velocity decreases by approximately 4.3%， while the rise time shortens by about 5.4%. In contrast， the differences among fiber types have minimal effect on these parameters. Among the sensor layout schemes， a four-sensor spatial diagonal arrangement exhibits the smallest localization error and the best stability. Uniaxial compression tests verify the effectiveness of the proposed parameter settings and layout scheme， with source localization results closely matching actual crack positions. This study proposes a practical method for AE parameter calibration and sensor layout scheme in SFRC， providing technical support for damage monitoring and health assessment of SFRC structures， with significant engineering application value.

Key words: steel fiber reinforced concrete, acoustic emission, sound velocity calibration, time parameter, sensor layout scheme, source localization accuracy

CLC Number:

TU528.57

GUO Yongmin, ZHANG Longjiao, AN Xinzheng, LI Weizhi, AN Shuhao, JI Mengqi, WANG Yan. Acoustic Emission Parameter Calibration and Source Localization Accuracy in Steel Fiber Reinforced Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(2): 471-481.

Figures/Tables 18

References 27

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Fiber type	Fiber length/mm	Equivalent diameter/mm	Aspect ratio/mm	Tensile strength/MPa
End-hook type	25	0.83	30	≥600
Shear type	35	0.85	40	≥600
Corrugated type	38	1.11	34	≥600

Fiber type	Fiber length/mm	Equivalent diameter/mm	Aspect ratio/mm	Tensile strength/MPa
End-hook type	25	0.83	30	≥600
Shear type	35	0.85	40	≥600
Corrugated type	38	1.11	34	≥600

Specimen	Lead break angle/（°）	Sensor 1 amplitude/dB	Standard deviation	Sensor 2 amplitude/dB	Standard deviation
T1	15	40.7	0.69	39.8	0.72
	30	41.2	1.42	40.4	1.58
	60	41.8	0.83	40.1	1.23
T2	15	42.5	1.55	41.6	0.91
	30	40.4	2.02	39.4	1.11
	60	41.7	1.54	39.9	1.53
T3	15	43.1	1.63	41.2	0.56
	30	43.5	1.98	40.9	0.93
	60	42.3	0.75	42.1	0.42
T4	15	40.9	0.63	38.7	0.78
	30	42.6	1.11	40.5	0.86
	60	41.3	0.96	40.7	0.85

Specimen	Lead break angle/（°）	Sensor 1 amplitude/dB	Standard deviation	Sensor 2 amplitude/dB	Standard deviation
T1	15	40.7	0.69	39.8	0.72
	30	41.2	1.42	40.4	1.58
	60	41.8	0.83	40.1	1.23
T2	15	42.5	1.55	41.6	0.91
	30	40.4	2.02	39.4	1.11
	60	41.7	1.54	39.9	1.53
T3	15	43.1	1.63	41.2	0.56
	30	43.5	1.98	40.9	0.93
	60	42.3	0.75	42.1	0.42
T4	15	40.9	0.63	38.7	0.78
	30	42.6	1.11	40.5	0.86
	60	41.3	0.96	40.7	0.85

Steel fiber content/%	Average sound velocity/（m·s^-1）	Standard deviation	Coefficient of variation（C.V.）/%
0	3 595.44	24.32	0.68
0.5	3 449.80	78.43	2.27
1.0	3 359.70	97.46	2.90
1.5	3 261.14	111.96	3.54