Dynamic mechanical properties of basalt fiber engineered cementitious composites

Basalt fiber engineered cementitious composites (BF-ECCs) were prepared by using a certain ratio of basalt fiber and cement-based material. The prepared material showed multiple cracks in static tensile test and its tensile strain was above 0.5%. For the cementitious composites with different basalt fiber contents, dynamic compression and dynamic splitting tests were carried out by using a split Hopkinson pressure bar (SHPB) device. The results show the followings. (1) Both the static and dynamic strengths are enhanced under compression and tension conditions by basalt fiber. At high strain rates, the dynamic increase in compressive strength is small, and the dynamic increase in the splitting strength is large. (2) The compressive and splitting strengths of the BF-ECCs increase significantly with increasing strain rate, both of which can use a dynamic increase factor (DIF) to reflect the increase in dynamic strength, but the strain rate sensitivity of the splitting strength is stronger than that of the compressive strength. (3) According to the test, the CEB-FIP equation (2010) of ordinary cement concrete rate sensitivity is not applicable to the BF-ECCs. © 2020, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.