Acoustic emissions evaluation of the dynamic splitting tensile properties of steel fiber reinforced concrete under freeze–thaw cycling

doi:10.1007/s11709-023-0988-4

Front. Struct. Civ. Eng.

2023, Vol. 17

Issue (9) : 1341-1356 https://doi.org/10.1007/s11709-023-0988-4

RESEARCH ARTICLE

Acoustic emissions evaluation of the dynamic splitting tensile properties of steel fiber reinforced concrete under freeze–thaw cycling

Hua ZHANG(

), Xinyue LIU, Lingyu BAI, Shanshan JI, Luoyu PAN, Xuechen LI

College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

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Abstract

This study empirically investigated the influence of freeze–thaw cycling on the dynamic splitting tensile properties of steel fiber reinforced concrete (SFRC). Brazilian disc splitting tests were conducted using four loading rates (0.002, 0.02, 0.2, and 2 mm/s) on specimens with four steel fiber contents (0%, 0.6%, 1.2%, and 1.8%) subjected to 0 and 50 freeze–thaw cycles. The dynamic splitting tensile damage characteristics were evaluated using acoustic emission (AE) parameter analysis and Fourier transform spectral analysis. The results quantified using the freeze–thaw damage factor defined in this paper indicate that the degree of damage to SFRC caused by freeze–thaw cycling was aggravated with increasing loading rate but mitigated by increasing fiber content. The percentage of low-frequency AE signals produced by the SFRC specimens during loading decreased with increasing loading rate, whereas that of high-frequency AE signals increased. Freeze–thaw action had little effect on the crack types observed during the early and middle stages of the loading process; however, the primary crack type observed during the later stage of loading changed from shear to tensile after the SFRC specimens were subjected to freeze–thaw cycling. Notably, the results of this study indicate that the freeze–thaw damage to SFRC reduces AE signal activity at low frequencies.

Keywords steel fiber reinforced concrete freeze–thaw cycling Brazilian disc splitting test acoustic emission technique dynamic splitting tensile acoustic emission properties

Corresponding Author(s): Hua ZHANG

Just Accepted Date: 26 May 2023 Online First Date: 23 November 2023 Issue Date: 21 December 2023

Cite this article:

Hua ZHANG,Xinyue LIU,Lingyu BAI, et al. Acoustic emissions evaluation of the dynamic splitting tensile properties of steel fiber reinforced concrete under freeze–thaw cycling[J]. Front. Struct. Civ. Eng., 2023, 17(9): 1341-1356.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-023-0988-4
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I9/1341

Tab.1 Mix proportions of concrete

Fig.1 Steel fibers.

Tab.2 Basic parameters of steel fibers

Fig.2 Cured Brazilian disc specimen.

Tab.3 Specimen testing conditions

Fig.3 Brazilian disc splitting test system.

Fig.4 Experimental system diagram.

Tab.4 AE parameter settings

Fig.5 AE system.

Fig.6 Definition of the characteristic parameters of an AE signal.

Fig.7 Splitting tensile strength according to testing condition: (a) 0 freeze–thaw cycle specimens; (b) 50 freeze–thaw cycles specimens.

Fig.8 Freeze–thaw damage factors of SFRC splitting tensile strength according to testing condition.

Fig.9 Energy counts according to fiber content (0 freeze–thaw cycle specimens): (a) 0%; (b) 0.6%; (c) 1.2%; (d) 1.8%.

Fig.10 Energy counts according to fiber content (50 freeze–thaw cycles specimens): (a) 0%; (b) 0.6%; (c) 1.2%; (d) 1.8%.

Fig.11 Peak frequency distribution of SFRC (0%) according to loading rate: (a) 0 freeze–thaw cycle; (b) 50 freeze–thaw cycles.

Fig.12 Peak frequency distribution of SFRC (1.2%) according to loading rate: (a) 0 freeze–thaw cycle specimens; (b) 50 freeze–thaw cycles specimens.

Fig.13 Peak frequency distribution of SFRC loaded at 0.02 mm/s according to fiber content: (a) 0 freeze–thaw cycle specimens; (b) 50 freeze–thaw cycles specimens.

Fig.14 Variation of RA and AF for the 0 freeze–thaw cycle specimens with fiber contents of (a) 0%; (b) 0.6%; (c) 1.2%; (d) 1.8%.

Fig.15 Variation of RA and AF for the 50 freeze–thaw cycles specimens with fiber contents of (a) 0%; (b) 0.6%; (c) 1.2%; (d) 1.8%.

Fig.16 Spectrum of AE signals in the 0 freeze–thaw cycle specimens subjected to loading rates of: (a) 2 mm/s; (b) 0.2 mm/s; (c) 0.02 mm/s; (d) 0.002 mm/s.

Fig.17 Spectrum of AE signals in the 50 freeze–thaw cycles specimens subjected to loading rates of (a) 2 mm/s; (b) 0.2 mm/s; (c) 0.02 mm/s; (d) 0.002 mm/s.

Fig.18 Spectrum of the AE signals in the 0 freeze–thaw cycle specimens according to fiber contents of (a) 0.0%; (b) 0.6%; (c) 1.2%; (d) 1.8%.

Fig.19 Spectrum of the AE signals in the 50 freeze–thaw cycles specimens according to fiber contents of (a) 0.0%; (b) 0.6%; (c) 1.2%; (d) 1.8%.

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