Do basalt fibers corrode in highly alkaline environments?

The construction industry is moving towards sustainability, by reducing CO2 emissions and resource consumption. Textile Reinforced Concrete (TRC) is emerging as a sustainable alternative to traditional materials, offering reduced weight and improved mechanical properties. The choice of textile is crucial for the composite’s final properties. Basalt fibers arise as a promising alternative for their ability to maintain mechanical properties at high temperatures and their corrosion resistance, essential in hars environments, though their performance in alkaline conditions is debated. Our research corrosion effects on basalt fibers and the role of the sizing. We have employed physico-chemical methods including XRF, and SEM for composition and surface analysis, alongside wettability and tensile tests. Results showed basalt fibers retain their mechanical strength after 72 and 168 hours in alaline conditions at room temperature, indicating good resistance. However, both pristine and desized fibers weaked when boiled in alkaline solutions for 30 minutes. Understanding basalt fiber’s properties and corrosion influence is vital for their optimal use in cement-based structures.