Direct tensile behavior of ultra high performance fiber reinforced concrete (UHP-FRC) at high strain rates

Abstract

This experimental study investigates the direct tensile behavior of ultra-high performance fiber reinforced concrete (UHP-FRC) at strain rates ranging from 90 to 146 /sec. The tests are conducted using a recently developed impact testing system that uses suddenly released strain energy to generate an impact pulse. Three fiber types were considered, a twisted fiber and two other types of straight fibers. Specimen impact response was evaluated in terms of first cracking strength, post cracking strength, energy absorption capacity and strain capacity. The test results indicate that specimens with twisted fibers generally exhibit somewhat better mechanical properties than specimens with straight fibers for the range of strain rates considered. All UHP-FRC series tested showed exceptional rate sensitivities in energy absorption capacity, generally becoming much more energy dissipative under increasing strain rates. This characteristic highlights the potential of UHP-FRC as a promising cement based material for impact-and blastresistant applications.

Experimental and numerical analysis of blast response of High Strength Fiber Reinforced Concrete slabs

“…The overpressure recorded in a pressure sensor located at 15 m from an explosion of 1.54 kg of explosive elevated 1.0 m over the ground [36] is presented in Fig. 2…”

“…Although some tests have been made to evaluate the response of HSFRC and the fibers contribution under high strain rate, the results are still contradictory [5]. There is not enough information concerning the role of fibers in the dynamic response of HSFRC at high strain rates [35,36]. Strain rate dependency was modeled using standard DIF functions available for plain concrete [28,30].…”

A Review on Partial Substitution of Copper Slag with Sand in Concrete Material

“…This feature highlights the prospective of UHP-FRC as promising cement based substance for impact-and blast-resistant functions. [22] III. CONCLUSION Copper slag can be employed as a substitute to ordinary sand in concrete.…”

Tensile response of UHPFRC under very low strain rates and low temperatures

“…Cement and Concrete Research 133 (2020) 106067 [20]. As such, majority of the studies on the effect of strain rate on the tensile mechanical properties of UHPFRC are concentrated to the dynamic domain (1 × 10 −4 s −1 to 1 × 10 2 s −1 ) [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. All of these works discuss the strain rate effect using the direct tension test except [21,30] who had conducted flexural bending tests and [27][28][29] who had used splitting tension tests to study the strain rate effects in the dynamic domain.…”