Fire resistance of fibroconcrete slab structures with addition of fiberglass macrofiber

Abstract

The results of experimental studies of fire resistance of slab structures made of fibroconcrete with the addition of fiberglass macrofiber are presented. Full-scale plates of solid cross-section with steel reinforcement and glass composite reinforcement were subjected to fire tests. During the experiments, the possibility of increasing the fire resistance limit of plates with composite reinforcement due to the introduction of fiberglass macrofiber into concrete, by analogy with polypropylene microfiber, was checked. According to the research results, it was found that the introduction of fiberglass macrofiber into concrete does not increase the fire resistance limit by loss of bearing capacity of slab structures, but increases the intensity of explosion-like destruction of concrete and the degree of damage to the heated surface in case of fire, and in thin-walled structures with a thickness of 50 mm leads to the formation of through cracks, holes and the onset of the fire resistance limit by loss of integrity. In addition, fiberglass macrofibre has increased toxicity in case of fire, which makes it necessary to limit the scope of its application for housing, public and industrial buildings, especially various types of tunnels where the operation of objects is associated with the mass stay of people.