Research on impact properties of basalt fiber concrete

Concrete structures may encounter accidental impacts during use, which may result in localized damage to the structure, or serious consequences such as collapse of the structure, bringing about irreparable losses. In order to ensure the safety of concrete in the impact condition, it is important to study the impact properties of concrete. The impact properties of Basalt Fiber concrete have been studied by SHPB test or drop hammer impact test.

Through the impact test found that the mixing of basalt fibers can improve the impact toughness of concrete, impact toughness with the increase in the amount of basalt fibers showed a trend of increasing and then decreasing, related research shows that the volume of basalt fiber mixing 0.3% and 0.36% of basalt fiber concrete impact performance is the best; compared to the damage characteristics of the specimen, the development of cracks and the final damage to the form of fracture, found that basalt fiber concrete for plastic damage, i.e., the mixing of basalt fiber can make the concrete effectively absorb the impact energy and has a toughening effect on the concrete. Comparison of the damage characteristics of the test pieces, crack development and the final form of damage fracture, found that the basalt fiber concrete for plastic damage, that is, mixed with basalt fibers can make the concrete effectively absorb the impact energy, and has a toughening effect on the concrete. The researchers studied the impact resistance of basalt fiber concrete with the volume of basalt fiber (0%, 0.4%, 0.6%, 0.8%) and the length of basalt fiber (6mm and 18mm) as variables. It was found that basalt fibers can improve the impact toughness of concrete, and the impact toughness with the increase of fiber mixing and become larger; the same fiber mixing, fiber length of 6mm impact performance is better than the length of 18mm fiber concrete.

In summary, basalt fiber admixture can improve the impact performance of concrete, but the optimal fiber admixture is not uniform, through a comparative analysis found that this phenomenon is caused by the test method, concrete mixing ratio, basalt fiber admixture and other factors, the unity of the relevant factors should be strengthened in the future test. In addition, the existing research focuses on the effect of fiber dosage on its impact performance, and should be carried out in the future to study the effect of strain rate and other factors on impact performance.