Writer： admin Time：2025-05-29 10:50 Browse：
Shotcrete is often used in projects such as tunnels, slope protection, mines, and foundation pits. In order to improve the life and performance of shotcrete, a certain amount of synthetic macro fiber(large /coarse) is usually added to inhibit the generation of cracks inside the concrete and improve the mechanical properties of the concrete. In shotcrete, the use of synthetic macro fiber is 3-9kg/m3. This dosage can significantly improve the tensile, shear, bending, abrasion and crack resistance of concrete, while enhancing its fracture toughness and impact resistance.
The role of synthetic macro fiber in shotcrete:
Steel-like fiber significantly improves the physical and mechanical properties of concrete by inhibiting the expansion of microcracks inside concrete and the formation of macrocracks. Specifically, steel-like fiber can:
·Inhibit crack expansion: By forming a support system in concrete, it effectively controls the early plastic shrinkage cracks and settlement cracks of concrete.
·Enhance toughness: Improve the toughness of concrete and increase the ability to resist temperature stress or bursting.
·Improve construction performance: Make the concrete perform well during mixing, transportation and construction, and suitable for pumping construction.
Specific application cases and effects
The application of synthetic macro fiber in shotcrete has achieved good results in actual projects. For example, in tunnel projects, the use of synthetic macro fiber reinforced concrete can provide rapid support, reduce rebound, enhance impact toughness, and also show good adaptability to tunnel sections with developed groundwater. In addition,synthetic macro fiber can also be used to reinforce concrete in projects such as roads, railways, tunnels, and culverts to improve the crack resistance, bending and tensile strength, and impact resistance of the panel structure.
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