Title: Relation between Strength and Yield Stress in Fiber- Reinforced Mortar

Author(s): Ronan Chometon, Maxime Liard, Pascal Hebraud, and Didier Lootens

Publication: Materials Journal

Volume: 121

Issue: 2

Appears on pages(s): 105-114

Keywords: critical volume fraction; fiber-reinforced mortar; flexural strength; master curves; mortar; rheology

DOI: 10.14359/51740371

Date: 4/1/2024

Abstract:
The need to constantly improve the quality and properties of manufactured products leads to the development of hybrid materials that combine different elements, complementing one another. Fiber-reinforced mortar is one of those products, as the fibers are used to improve cementitious materials’ flexural weakness. Experimental data on different metallic fibers dispersed in mortar demonstrate the correlation between early-age rheological properties and long-term mechanical strength. Both quantities depend on the ratio of the solid volume fraction of the fiber to a critical solid volume fraction characteristic of the form factors of the fiber. It is demonstrated that both effects arise from the packing stress of the fibers in the mortar when their concentrations are close to their maximum packing fraction. Geometrical arguments are used to explain how this critical volume fraction is related to the fiber form factor. Then, it enables the building of master curves using geometrical arguments.