Analysis of Chopped Basalt Fiber Application in Concrete
In addition to basalt fibers, carbon fibers, Glass Fibers, and aramid fibers have also been used as reinforcing materials in concrete. However, long-term practice has shown that these materials present certain issues when applied to concrete, making it difficult to meet market demands for high-performance concrete. The emergence of chopped basalt fiber has filled this gap in both materials and methods, greatly promoting the development of concrete reinforcement and strengthening technology. Its role in concrete reinforcement is primarily reflected in the following aspects:
1.Effective Crack Inhibition: Chopped basalt fibers, leveraging their quantity and surface area advantages, can effectively restrain micro-cracks and prevent their propagation and connection. Simultaneously, they overcome the disadvantages of other synthetic fibers, such as low density, low tensile strength, and low elastic modulus. They are not easily pulled apart during crack propagation, significantly hindering the development of micro-cracks and delaying the formation of new ones, which positively impacts concrete's impermeability and freeze-thaw resistance.
2.High Modulus and Construction Convenience: Chopped basalt fibers not only offer the advantages of high modulus and high single-filament tensile strength, similar to steel fibers, to inhibit crack propagation, but they also effectively overcome the drawbacks of steel fibers, such as their tendency to clump during mixing, which hinders pumping and construction.
3.Good Dispersion and Compatibility: As a silicate-based inorganic fiber, chopped basalt fiber possesses natural compatibility with cement-based materials. Its density (approximately 2.63-2.80 g/cm³) is similar to that of cement concrete and mortar, ensuring good workability, and it can disperse uniformly within the concrete structure after incorporation.
4.Excellent Durability: Surface-modified chopped basalt fibers exhibit "inert fiber" characteristics, demonstrating exceptional high-temperature resistance, corrosion resistance, and impact resistance. They maintain stability even in high-temperature and highly corrosive environments and can improve the deformation resistance of the cementitious matrix. Therefore, they can adapt to the demanding environments of concrete mixing, pouring, setting, and use stages, significantly enhancing concrete's durability.
In summary, chopped basalt fiber can effectively improve concrete's impact resistance, reduce its brittleness, and comprehensively enhance its mechanical properties. Specifically, it can play roles in crack inhibition, impermeability, enhanced durability, improved impact and tensile resistance, and contribute to improved appearance quality in concrete structures.
