Durability studies on basalt fibre reinforced concrete

摘要

Development of a durable and sustainable concrete especially with natural fibres has been one of the major focus areas of industrial and academic world in recent years. Among the natural fibres the basalt is considered to have exceptional properties with respect to durability. The deterioration of concrete due to chemicals occurs by movement of fluids like water, ions etc. which react and decompose hydrated products in concrete and in-turn leads to leaching. In the event of severe fire exposure, the concrete loses its strength and may suffer severe damage. Thus reinforcing concrete with high thermally and chemically stable basalt fibre can prevent damages by reducing penetration of ions and thermal cracks in concrete. This paper presents durability studies on basalt fibre reinforced concrete (BFRC) in chemical solutions, carbonation, rapid chloride penetration and fire. BFRC showed strong resistance to acid solutions, chloride penetration and fire. The performance of BFRC was found better than control concrete. BFRC have 70% less carbonation to control concrete whereas chloride ion permeability of the control concrete was 49% more than BFRC at the age of 56 days. BFRC retained 82.57% and 89.53% of its compressive strength in 28 days after immersion in NaOH and HCI respectively, whereas, control concrete retained 60.51% and 72.36%. Residual compressive strength of BFRC at 800°C was 65.98% whereas it was only 52.29% for control concrete.