May.2023 17
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What role does basalt fiber play in concrete?

Introduction
It has many excellent properties such as high strength, high stability, corrosion resistance and high temperature resistance.
Details
Concrete is a traditional building material. What role does basalt fiber play in concrete? Facing the increasingly complex construction environment and special requirements such as rush repair and construction, its early shortcomings of low strength need to be solved urgently. At present, there are many studies on early-strength concrete, but most of them focus on the mix design, workability improvement and compressive flexural strength of early-strength concrete. These studies mainly focus on the static mechanical properties of early-strength concrete, while about There are few studies on the dynamic mechanical properties of early-strength concrete.
In the actual environment, because the emergency repair and construction projects are put into use quickly, under the influence of many factors such as vehicle driving, bridge vibration, aircraft take-off and landing, etc., the concrete will inevitably be affected by impact loads in the early stage. Therefore, the study of early-strength concrete The early dynamic properties are of great significance to the normal use and safety assessment of rapid repair projects. Basalt fiber is a continuous fiber formed by drawing after melting basalt material at high temperature. It has many excellent properties such as high strength, high stability, corrosion resistance and high temperature resistance. Mixing basalt fiber into concrete can effectively improve the mechanical properties of concrete. Currently, there are many studies on basalt fiber concrete, but the use of basalt fiber in early-strength concrete has not yet been reported, and its excellent mechanical properties will inevitably make early-strength concrete have better early comprehensive properties.
Basalt fiber is an inorganic fiber material made from basalt ore formed by volcanic eruptions through high-temperature melting and drawing. This is a new type of fiber material that has just been developed in China in recent years. It is similar to other high-tech fibers such as carbon fiber and aramid fiber. Compared with fiber, it has unique advantages. Basalt has unique high temperature resistance. The maximum temperature it can withstand can reach 700℃, and it can also reach -269℃ at low temperatures (softening point is 960℃), which is significantly higher than the -60~450℃ of glass fiber. When basalt fiber works in structures below 400°C, its breaking strength can maintain 85% of its original strength; when it works in structures below 600°C, its breaking strength can still maintain 80% of its original strength. It can be seen from these data , basalt fiber reinforced concrete material shows excellent high temperature resistance and is the first choice among high temperature resistant building materials.
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