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Polyolefin fiber-reinforced concrete composites. Part I. Damping and frequency characteristics
The investigation of the dynamic properties of polyolefin fiber-reinforced concrete composites (FRC) was conducted with a free-free beam vibration method. The damping ratio increase and response frequency decreased with an increase in the Maximum Response Amplitude. Crimped fiber and fine smooth surface fiber- (fine fiber) reinforced concrete exhibited better damping than other FRC and plain concrete. This damping was sensitive to the Small Amplitude Response Frequency. The damping ratio, 1% minimum, in crimped FRC was double that in plain concrete at frequencies around 600 Hz and specimen age of 8 weeks. The damping ratios, 0.4% minimum, in crimped fiber and fine-FRC were higher than those in other FRCs and plain concrete only when the Maximum Response Amplitude reached a certain value (0.001 cm) at a frequency range of 1050-1250 Hz and specimen age of 24 weeks. An increase in damping with an increase in the Maximum Response Amplitude was accompanied by a large decrease in response frequency in crimped fiber and fine FRC. The damping ratio decreased and the response frequency increased with vibration cycle; again, strong tendencies existed in crimped fiber and fine FRC.
Polyolefin fiber-reinforced concrete composites. Part I. Damping and frequency characteristics
The investigation of the dynamic properties of polyolefin fiber-reinforced concrete composites (FRC) was conducted with a free-free beam vibration method. The damping ratio increase and response frequency decreased with an increase in the Maximum Response Amplitude. Crimped fiber and fine smooth surface fiber- (fine fiber) reinforced concrete exhibited better damping than other FRC and plain concrete. This damping was sensitive to the Small Amplitude Response Frequency. The damping ratio, 1% minimum, in crimped FRC was double that in plain concrete at frequencies around 600 Hz and specimen age of 8 weeks. The damping ratios, 0.4% minimum, in crimped fiber and fine-FRC were higher than those in other FRCs and plain concrete only when the Maximum Response Amplitude reached a certain value (0.001 cm) at a frequency range of 1050-1250 Hz and specimen age of 24 weeks. An increase in damping with an increase in the Maximum Response Amplitude was accompanied by a large decrease in response frequency in crimped fiber and fine FRC. The damping ratio decreased and the response frequency increased with vibration cycle; again, strong tendencies existed in crimped fiber and fine FRC.
Polyolefin fiber-reinforced concrete composites. Part I. Damping and frequency characteristics
Yan, L. (author) / Jenkins, C.H. (author) / Pendleton, R.L. (author)
Cement and Concrete Research ; 30 ; 391-401
2000
11 Seiten, 19 Quellen
Article (Journal)
English
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