Basalt fiber reinforced concrete is a composite material formed by combining chopped basalt fibers with a concrete matrix. It exhibits excellent toughness and fire resistance and is primarily used for non-load-bearing and secondary load-bearing structural components.
(1) Incorporating basalt fibers into concrete creates a uniform, randomly oriented internal support system, resulting in an effective secondary reinforcement effect. The random distribution of basalt fibers mitigates plastic shrinkage; shrinkage energy is dispersed across countless fiber filaments, thereby effectively enhancing the concrete's toughness and reducing cracks caused by shrinkage during the initial setting stage.
(2) The addition of fibers helps alleviate internal stresses caused by temperature fluctuations, preventing the propagation of thermal cracks. Furthermore, the mixing process introduces air into the concrete, increasing the air content and improving freeze-thaw resistance.
(3) The large number of fibers uniformly distributed throughout the concrete acts as a supporting network, reducing surface bleeding and aggregate segregation, which significantly lowers the content of micropores. Additionally, the fibers reduce initial micro-cracks; the resulting crack-arresting effect enhances the concrete's impermeability.
(4) After mixing, the fibers are randomly distributed within the concrete. This reduces shrinkage stress and increases cohesiveness, effectively preventing segregation and hindering moisture migration, thereby reducing the likelihood of plastic shrinkage cracking in the cement mortar matrix.
(5) Adding fibers improves the concrete's shear strength, splitting tensile strength, and fatigue resistance. It significantly enhances mechanical properties, preventing structural defects often associated with the low values of these parameters in ordinary concrete.
(6) The addition of fibers has no adverse effects during mixing, pouring, or molding; the fibers bond well with the matrix, improving the concrete's cohesiveness and stability.
