Effect of Macro Fibers on the Permeability and Crack Surface Topography of Layered Fiber Reinforced Concrete

Wei Zeng (1, 2) , Weiqi Wang (2) , Qiannan Wang , Mengya Li (3) , Lining Zhang , Yunyun Tong (4)

1 Jiangxi Normal University
2 Fudan University [Shanghai]
3 L2MGC - Laboratoire de mécanique et matériaux du génie civil
4 Zhejiang Sci-Tech University

This paper describes the effects of macro fibers on permeability and crack surface topography of layered fiber-reinforced concrete (FRC) specimens with different layering ratios under uniaxial tensile load. The crack permeability of layered FRC specimens is investigated by a self-designed permeability setup. The topographical analysis of crack surfaces is investigated by a custom-designed laser scanning setup. The results show that when the fiber volume content and layering ratio of the FRC layer are constant, the tensile toughness of layered FRC specimens depends on the proportion of steel fiber in macro fibers, and with an increase in the proportion of steel fiber, the tensile toughness of layered FRC specimens increases. For the layered FRC specimens, the crack permeability is much lower than that of the normal concrete (NC) specimen. A significant positive synergistic effect on crack impermeability can be achieved by the combination of steel fiber and polypropylene fiber in the SF80PP2.3 specimen. The crack surface roughness parameter (Rn) values of the NC layer in layered FRC specimens are all higher than those of the NC specimen, and the crack surface Rn of the FRC layer in layered FRC specimens is higher than that of the unlayered FRC specimens. This can effectively increase the head loss of cracks and reduce the crack permeability of layered FRC specimens.

Mots clés: permeability crack surface topography layered fiber-reinforced concrete layering ratio uniaxial tensile load; permeability; crack surface topography; layered fiber-reinforced concrete; layering ratio; uniaxial tensile load

Domaines: Génie civil

Wei Zeng, Weiqi Wang, Qiannan Wang, Mengya Li, Lining Zhang, et al.. Effect of Macro Fibers on the Permeability and Crack Surface Topography of Layered Fiber Reinforced Concrete. Materials, 2024, 17 (8), pp.1733. ⟨10.3390/ma17081733⟩. ⟨hal-04559721⟩