Title: A new multi-scale hybrid fibre reinforced cement-based composites

Author(s): Li, L.; Cao, M.

Publication: Symposium Paper

Volume: 343

Issue:

Appears on pages(s): 12-19

Keywords: Multi-scale hybrid fibre, CaCO3 whiskers, compressive behavior, flexural behavior

DOI:

Date: 10/1/2020

Abstract:
Nowadays polyvinyl alcohol (PVA) and steel hybrid fibre reinforced cement-based composites (HFRCC) are studied to resist static, seismic and impact loading. In this research, calcium carbonate (CaCO3) whisker is introduced to develop a multi-scale HFRCC, with 35mm hooked end steel fibre, 6mm PVA fibre and CaCO3 whisker. The compressive and flexural behaviors of the new HyFRCC are explored. Compared to the conventional hybrid fibers (steel fibre and PVA fibre), the addition of multi-scale fibres (steel fibre, PVA fibre and CaCO3 whisker) can improve the compressive strength and toughness of cement-based composite. Multi-scale fibre usage leads to notable increase to both the flexural strength and flexural toughness values of cement-based composite. Based on these test results, we can conclude that there is a remarkable fiber synergy in multi-scale hybrid fibre reinforced cement-based composites with 35mm hooked end steel fibre, 6mm PVA fibre and CaCO3 whisker. Moreover, it seems possible that the steel fibres and PVA fibres can be partly replaced by CaCO3 whiskers, which is very beneficial in decreasing the production cost of HFRCC for potential structural applications.