Polyolefin fiber-reinforced concrete composites: Part I. Damping and frequency characteristics

• Published in: Cement and concrete research Vol. 30; no. 3; pp. 391 - 401
• Main Authors: Yan, L, Jenkins, C.H, Pendleton, R.L
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Ltd 2000; Elsevier Science
• Subjects: Applied sciences; Buildings. Public works; Composite; Concretes. Mortars. Grouts; Exact sciences and technology; Fibre reinforced concrete (including asbestos cement); Materials; Miscellaneous (including polymer concrete, repair and maintenance products, etc.); Polyolefin fiber; Composite; Polyolefin fiber; Vibrational analysis; Damping coefficient; Free vibration; Fiber reinforced concrete; Olefin polymer; Dynamic properties; Frequency response; Experimental study; Composite material; Beam(mechanics)
• ISSN: 0008-8846; 1873-3948
• DOI: 10.1016/S0008-8846(99)00267-7

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.