Detailed Points of Commonly Used Steel Fibers for Concrete

Shear Type Steel Fibers for Concrete

Shear type steel fiber is made from cold-rolled strip steel through cutting and scoring processes. It has characteristics such as high tensile strength, easy dispersion, and good bonding with concrete. Here are some key parameters and features of shear type steel fibers for concrete:

Specifications

The specifications of shear type steel fiber are generally expressed through length and diameter, with common lengths ranging from 20~60mm and diameters ranging from 0.3~1.2mm.

Aspect Ratio

The aspect ratio refers to the ratio of the length to the diameter of the steel fiber. In certain specific specifications of shear type steel fibers, the aspect ratio can reach 44.3.

Tensile Strength

The tensile strength of shear type steel fiber is one of its essential performance indicators. Depending on the material and manufacturing process, its tensile strength varies, generally ranging from 380~800MPa, with some even reaching or exceeding 800MPa.

Bonding Strength

The bonding strength between the steel fiber and concrete is crucial for the performance of the concrete. Shaped steel fiber has an advantage in bonding strength compared to straight steel fiber, enhancing the effect by approximately doubling.

Hardness

The surface hardness of shear type steel fiber is relatively high, preventing bending during mixing with concrete. It can withstand bending of 3mm steel rods at 90 degrees without breaking.

Corrosion Resistance

If the steel fiber embedded in the concrete is compacted and isolated from air, it generally does not rust. However, if the steel fiber is exposed on the concrete surface or the crack width exceeds 0.25mm, the steel fibers bridging the cracks are more susceptible to corrosion.

The application range of shear type steel fiber is extensive, including highways, bridges, tunnels, airports, ports, hydraulic and hydroelectric engineering, and other fields.

Wavy Steel Fibers for Concrete

Wavy steel fibers for concrete is a special type of steel fiber with specific shapes and parameters. Here are some key parameters of wavy steel fiber:

Length

The length of wavy steel fiber typically ranges from 30~50mm. This range allows the steel fiber to effectively enhance the mechanical properties of concrete.

Diameter

The diameter ranges from 0.3~0.9mm. The choice of diameter influences the strength of the steel fiber and its bonding capability with concrete.

Strength

The strength range of wavy steel fiber is generally high, reaching 600~2000MPa. This strength level can significantly improve the compressive and flexural strength of concrete.

Single Fiber Steel Fibers for Concrete

Single fiber steel fiber is an important material for enhancing concrete performance, and its parameters significantly impact concrete properties. Here are some key parameters of single fiber steel fibers for concrete:

Length

The length of single fiber steel fiber typically ranges from 30~65mm, but some specific common lengths include 30mm, 35mm, 40mm. Different lengths of steel fiber are suitable for different types of concrete structures to meet specific engineering requirements.

Diameter

Diameters usually range from 0.25~1.0mm, with specific common diameter specifications like 0.5mm, 0.6mm, 0.7mm. The diameter affects the strength of the steel fiber and its bonding capability with concrete.

Tensile Strength

The tensile strength of single fiber steel fiber is a crucial performance indicator. The tensile strength usually should not be less than 600MPa, and some high-end products may have higher tensile strength to ensure the steel fiber effectively functions within the concrete.

Shape and Structure

The shape and structure of single fiber steel fiber also impact performance. Some products employ specific processes like cold drawing and heat treatment to optimize their molecular structure, improving tensile strength and bonding capability with concrete.