Title: Strain Rate Sensitivity of Fiber-Reinforced Cementitious Composites
Author(s): H. Othman and H. Marzouk
Publication: Materials Journal
Appears on pages(s): 143-150
Keywords: dynamic increase factor; fiber-reinforced cementitious composites (FRCC); impact loading; quasi-static; steel fiber; strain rate effect
An experimental investigation has been conducted to determine the effects of strain rate on fiber-reinforced cementitious composite (FRCC) matrixes. Compressive strength, modulus of elasticity, and flexural tensile strength are investigated under various strain rates ranging from the static to the seismic and/or impact level. Three different matrixes with compressive strengths ranging from 80 to 130 MPa (12 to 19 ksi) are investigated. The first matrix is without fiber, while the other two contain 2% straight steel fibers by volume. The tests are carried out according to ASTM standards. The dynamic increase factor (DIF) formulation recommended by the European CEB-fib is described. Experimental results showed that the rate sensitivity decreases with an increase in the matrix compressive strength. Additionally, it has been found that CEB-fib Model Code 2010 fits well with high-strength concrete. On the other hand, the CEB-fib Model (2010) overestimates both compressive and tensile strengths enhancement for FRCC with compressive strength over 110 MPa (16 ksi).