New progress in research on high-temperature performance of basalt fiber concrete helps improve building fire safety

Recently, new progress has been made in the research on the mechanical properties of basalt fiberconcrete under the action of high temperature. The study shows that the incorporation of Basalt Fibers can significantly improve the high temperature resistance of concrete, providing a new solution for building fire safety.

When a fire occurs in a building, the high temperature will cause internal damage to the concrete structure, reduce its bearing capacity, and in severe cases, even trigger the overall failure of the structure. In order to mitigate the damage caused by fire to the building structure, it is particularly important to study the performance of concrete in high temperature environment. Basalt fibers have become the focus of scholars' attention due to their excellent high temperature resistance.

Currently, the study mainly explores the high temperature performance of basalt fiber concrete through the mass loss rate, compressive strength, flexural strength and other indicators after high temperature. The study found:  
1. mass loss rate: the mixing of basalt fibers has a small effect on the loss of concrete mass, but with the increase in temperature, the rate of concrete mass loss gradually increases and reaches a maximum at 800℃.  
2. Compressive strength: the compressive strength of concrete shows a trend of increasing and then decreasing with the increase of temperature, and reaches the peak at 400℃. Basalt fiber dosage of 2.0kg/m³ or volume dosage of 0.4%, the maximum compressive strength.  
3. Flexural strength: the flexural strength decreases gradually with the temperature increase, but reaches the maximum value when the basalt fiber doping is 2.0kg/m³.  
4. Anti-cracking property: the admixture of basalt fiber can also improve the anti-cracking property of concrete after high temperature and reduce the phenomenon of high temperature bursting.

It was also found that the effect of high temperature on the mechanical properties of concrete was more significant than the fiber admixture. However, the current study focuses on compressive strength and flexural strength, and further research on other properties is needed in the future. In addition, the fire environment is complex and variable, only consider the effect of temperature and fiber dosage is relatively single, future research should consider the heating time, heating rate and other factors under the common effect of concrete performance.

Experts pointed out that the basalt fiber concrete research to improve the fire safety of building structures provides an important basis for the future is expected to high-rise buildings, tunnels and other high-risk areas of fire are widely used.