Impact energy absorption and mechanical properties of fibre reinforced cementitious composite containing crumb rubber

Fibre reinforced cementitious composites (FRCC) are known for their superior material properties, including high tensile strength and ductility, which make them attractive for structural applications. However, to further enhance their toughness properties and impact energy absorption (IEA), FRCC containing crumb rubber (CR) was investigated to mitigate cracking and brittleness under impact loads. Two CR sizes, 0.5–2 mm and 2–5 mm, replaced 5%, 10%, and 15% of fine aggregate, while PVA fibre dosage varied at 1%, 1.5%, and 2%. In FRCC mixes, the addition of CR reduced density, compressive strength, and flexural strength. However, incorporating 10% CR (5 mm) increased the toughness index by 30% compared to the control specimen, while 15% CR (5 mm) with 2% PVA fibre enhanced IEA by approximately 12%. The statistical results of the two-way ANOVA test indicated that both PVA fibre and CR content significantly influenced the enhancement of IEA in FRCC.