How to Choose Steel Fibers Manufacturers?

So you are considering using steel fibers as a reinforcement &#; perhaps for an industrial concrete floor? An excellent idea, as steel fibers provide the properties you need such as high tensile strength, ductility, and toughness.

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However, it is important to select the correct steel fiber for a specific application. This means understanding the differences between the two main types of steel fiber that are used for concrete reinforcement, namely Type I and Type II steel fibers.

Type I steel fibers are made from high-carbon steel wires, while Type II steel fibers are made from low-carbon steel wires. This difference in composition results in different mechanical properties of the fibers and their suitability for different applications.

Type I steel fibers are also cold-drawn per ASTM A820 while Type II steel fibers are manufactured as slit-sheets (cut into strips from thin steel sheets). This difference in manufacturing provides Type I steel fibers with a circular cross-section and Type II steel fibers with a rectangular cross section.

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 Cold-drawn steel fibers have tensile strength from 145,000 to 445,000 psi, While the other types tensile strength as low as 50,000 psi. Fiber shapes range from round wires with deformed ends in different diameters (cold-drawn wire), rectangular or square rod shapes with dimples (cut sheet steel fiber), triangular cross-section and twisted (mill cut steel fiber), or crescent cross-section and corrugated (modified cold drawn steel fiber), as well as other shapes. They also come in different lengths, ranging from 1/4 inch to more than 2 inches. There is a tradeoff with length. Longer fibers tend to perform better but they can be more difficult to blend and mix well into concrete. To solve this problem, manufacturers often bundle fibers using water-soluble glue to achieve better dispersion in concrete during mixing.

Diameter or perimeter dimensions between products differ and fiber manufacturers sell different shapes. The challenge is to deform fiber ends in such a way as to achieve maximum anchorage with concrete and good cement paste bond along the length of the fiber.

You also can gage fiber effectiveness by aspect ratio&#;the length divided by the diameter. The higher the aspect ratio the better the performance. Longer fibers have higher aspect ratios. Use aspect ratios to compare fibers of equal length.

Some manufacturers blend steel fibers with polymer plastic macro and micro fibers in order to get a synergistic effect.

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