A review of properties of bio-fibrous concrete exposed to elevated temperatures

Abstract

The use of natural fibers in cementitious composites has helped in eco-sustainability and green constructions. The susceptibility of bio-fibrous concrete (BFC) to fire is inevitable as its usage increases globally. Critical understanding of the residual properties of BFC is vital to its safety design criteria and acceptability of its use. Researches on the post-fire performances of steel and synthetic fibrous concrete at elevated temperatures have been reviewed extensively. However, there is no review yet on the high-temperature performance of BFC, despite the attention it currently receives from researchers. Therefore, this paper presents a comprehensive review of the residual properties of BFC after exposure to elevated temperature. It was discovered from the reports that the critical temperature for BFC is at the temperature range of 300–400C. However, lignocellulose fibers (jute, coir, hemp, sisal and hybrids) are beneficial to mitigating micro-cracks and explosive spalling in the heated high-performance concrete and ultra-high-performance concrete, as compared with unreinforced concrete composites.