Performance of Glass Fiber, Basalt Fiber: Subjected to Fire

Abstract

Abstract— Over the decades, there was a widespread increase in the use of fiber in concrete for improving its properties such as tensile strength and ductility. The fiber reinforced concrete is also used in retrofitting existing concrete structures. Dispersed fiber reinforcement of concrete improves specific properties and one of them is fire resistance. In numerous research was proven that glass fiber and basalt fiber can inhibit or partly prevent concrete from explosive spalling. New kind of fiber may be be used as dispersed reinforcement are chopped basalt fiber (BF) and glass fiber with ability to improve not only physical and mechanical properties of concrete but also to resist fire . Basalt is rock with suitable properties for resistance to high temperatures, as low coefficient of thermal expansion and stability up to 600 °C to 700 °C. Glass fiber has benefits of getting higher tensile strength and fire resistant properties, thus reducing the loss of damage during fire accident of concrete structures. Concrete mixes with various doses of cement and chopped basalt fiber and glass fiber had been investigated in this study. Properties of fresh and hardened concrete had been examined and evaluated temperatures.Due to large damages of concrete structure it was not possible to measure changes of porous system evaluated by spacing factor after thermal load. Compressive strength was examined before and after thermal load. Special thermal regimes with maximum temperature 200 °C, 300 °C,400˚C and 500 °C were applied. Results showed that chopped basalt fiber and glass fiber have positive impact not only on mechanical properties of concrete but also on its fire resistance. Two specific doses of chopped basalt fiber and glass fiber were tested but further research is in progress. Many studies are under way in this modern world in construction fields and seen that use of fiber reinforced concrete can lead to more effective and efficient construction material. Keywords— Chopped basalt fiber (BF), Glass fiber, Thermal load, fire resistance, spacing factor.