Investigating direct tensile behavior of high performance fiber reinforced cementitious composites at high strain rates

• Published in: Cement and concrete research 2013-08, Vol.50, p.62-73
• Main Authors: Tran, Tuan Kiet, Kim, Dong Joo
• Format: Article
• Language: English
• Subjects: Applied sciences; Buildings. Public works; Cement reinforcements; Cements; Concretes. Mortars. Grouts; Cracks; Dynamic increase factor; Exact sciences and technology; Fiber composites; Fibre reinforced concrete (including asbestos cement); High performance fiber reinforced cementitious composites; High speed camera; High speed cameras; High strain rate; Image transmission; Materials; Strain; Strain energy impact test system; Strain rate effect
• ISSN: 0008-8846; 1873-3948
• DOI: 10.1016/j.cemconres.2013.03.018

This research reported the process of measuring direct tensile stress versus strain response of high performance fiber reinforced cementitious composites (HPFRCCs) at high strain rates between 10s−1 and 40s−1. High rate tensile tests were performed using a strain energy frame impact machine (SEFIM) built by authors. The stress history of HPFRCC at high rates was estimated from two strain gauges attached on two sides of a transmitter bar while the strain history was obtained by analyzing the sequential images recorded using a high speed camera. HPFRCCs exhibited strong rate sensitivity, i.e., their tensile parameters, including post cracking strength, strain capacity, peak toughness, and number of cracks, were significantly enhanced as the strain rate increased although the enhancement was different according to the types of fiber. The source of the dynamic enhancements in the tensile parameters of HPFRCCs was discussed.