Mechanics behaviors study of Hybrid fiber reinforced cementitious composites exposed high temperatures

Abstract

Hybrid Engineering Cementitious Composite (HECC) combines different fibers’ advantages, but based on the current research, the mechanical behaviors exposed to high temperature of HECC mixed with Polyvinyl Alcohol fiber, steel fiber, and basalt fiber still need to be much more studied. HECC's mechanical properties can be obtained from tensile and compression experiments. The mechanical properties investigation of PVA-ECC(mixed with only PVA fiber), BF-ECC(mixed with only BF), SF-ECC(mixed with only SF), HECC-PB(mixed with PVA and BF), and HECC-PS (mixed with PVA and SF) adding 65%, 70%, and 78% fly ash individually were conducted at room temperature. The mechanical properties experiment after high temperature of the above five materials mixed with 70% fly ash were conducted, which was heated to 200°C, 400°C, 600°C, and cooled to room temperature. According to specimen's appearance change, strength change, mass loss, ductility loss and failure form, HECC-PS has the best tensile and compressive behaviors after exposing high temperature, which can be as plastering layer on masonry structure surface to ensure the safety of masonry at high-temperature environment.