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Investigation on the effect of silane coupling agent treatment of steel fibers on the durability of UHPC

Du Shuang, Luan Congqi, Yuan Lianwang, Du Peng, Zhou Zonghui, Wang Jinbang

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 2

art. no. e118, 2023

Ultra-high performance concrete (UHPC) is a type of cementitious material that has been specifically engineered to achieve exceptional mechanical properties and durability through optimized particle filling. However, the addition of steel fibers to the UHPC matrix creates a transitional region at the interface. Previous research has indicated that the use of silane coupling agents (SCA) on the surface of steel fibers is a promising approach for improving the bonding properties between the fibers and the matrix. This study aims to explore the impact of varying amounts of untreated steel fibers versus those that have undergone SCA treatment on the durability of UHPC. The findings indicate that treating steel fibers with SCA significantly narrows the pore space between the matrix and steel fibers, as well as enhances the production of hydration products on the steel fiber surface. Furthermore, this treatment facilitates the formation of a compact transition zone between the UHPC matrix and steel fibers. The electrochemical corrosion resistance, chloride ion penetration resistance, frost resistance, and sulfate erosion resistance of UHPC are all enhanced by this method. As a result, the durability of UHPC is significantly improved, making it an extremely promising avenue of research.

Changes in fractal dimension and durability of ultra‑high performance concrete (UHPC) with silica fume content

Luan Congqi, Wang Jingyu, Gao Jinxu, Wang Jinbang, Du Peng, Zhou Zonghui, Huang Yongbo, Du Shuang

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 3

art. no. e123

The combined utilization of silica fume (SF) and steel fiber in UHPC is an inevitable trend to improve its mechanical properties and durability. In this study, the influence of SF dosage on mechanical property, permeability, drying shrinkage as well as the pore structure and fractal dimension (Ds) of UHPC was investigated. Finally, the relationships between the durability of UHPC and the porosity as well as the Ds were revealed and discussed. The results demonstrate that the synergistic effect of SF and fiber increased mechanical properties of UHPC due to the friction and mechanical interlocking of the steel fiber to the fiber-matrix and the adhesion between fiber and paste provided by the silica fume. In addition, incorporating 20% enhanced the mechanical property, decreased the chloride diffusion coefficient, and increased the Ds value. Moreover, increasing Ds value linearly raised compressive strength and drying shrinkage but nonlinearly depressed permeability in UHPC, so Ds can be served as a navel parameter to characterize the permeability and drying shrinkage of UHPC.