The Application of UHPC Steel Fiber in Bridge Engineering

We know that the properties of concrete are divided into low strength, normal strength, high strength concrete, ultra high strength concrete, high performance concrete (HPC), and ultra high performance concrete (UHPC). For bridges, stability is the primary consideration. That’s why uhpc steel fiber is widely used in bridge projects.

So what are the advantages of uhpc steel fiber? The most basic material advantages are reflected in:

1. Axial compressive strength is greater than 120MPa

2. Long-lasting axis tensile strength is greater than 6MPa

3. Good tensile resistance, ultimate tensile strain exceeds 0.3%

4. Excellent resistance to harsh environmental effects, elastic modulus greater than 4.0 X 104 MPa

It is precisely because of these characteristics that uhpc steel fibers are used in bridges. Of course, the characteristics of uhpc are not only the function of steel fiber materials, after all, cement, silica fume, quartz powder, silica sand, etc. can be mixed together to produce 1+1 greater than 2 effect.

So what is the compression resistance of uhpc steel fiber? See the picture below for details.

1. Generally, the compressive strength of uhpc steel fiber can reach 200MPa under steam curing.

2. Its strength can reach 120MPa under normal temperature maintenance.

3. It is not difficult to see from the icon that as the steam curing temperature increases, its compressive strength also increases significantly.

4. After high-temperature (250°C) steam curing under normal atmospheric pressure, the strength can reach 550 MPa, and if pressurized, it can exceed 800MPa.

Next, let me tell you about the tensile properties of uhpc steel fiber:

1. Invisible dense initial crack stage (micro-cracks gradually appear locally in the base material, small-diameter short fiber space bridges accept force and stress is redistributed)

2. Visible crack appearance stage (the matrix material withdraws from the action and the large-diameter long fiber space bridge accepts the force)

3. Destruction (fiber bridging failure)

The last thing is its durability performance

1. High-density matrix material effectively prevents the intrusion of harmful substances

2. The general mechanism of concrete performance deterioration is greatly weakened after adding uhpc steel fiber.

Therefore, it is not difficult to find from these icons that these advantages of uhpc steel fiber make it widely used in bridge projects. If you need to purchase it, please contact our company.

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