Coated steel fiber for reinforcement of a cementitious matrix

A steel fiber and coating technology, applied in the field of steel fiber, can solve problems such as shortened service life of zinc coating, brittle zinc coating, and decreased corrosion resistance

Pending Publication Date: 2022-01-14
NV BEKAERT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zinc coating becomes brittle and starts to flake off, which is not good for setting cold work anchors at steel fiber ends
In addition, the service life of the brittle zinc coating is shortened and the corrosion protection ability is reduced

Method used

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  • Coated steel fiber for reinforcement of a cementitious matrix

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The steel fiber according to the present invention can be produced as follows.

[0031] The starting product is a steel wire rod with a diameter of 5.5mm or 6.5mm, the steel composition of which is: carbon content of at least 0.35wt%, manganese content of 0.40wt% to 0.70wt%, silicon content of 0.15wt% to 0.30wt%, sulfur content of at most 0.05 wt%, phosphorus content up to 0.05 wt%. There may be small amounts of chromium, nickel or copper up to 0.20 wt%.

[0032] The steel wire rod is dry-drawn into a semi-finished steel wire with a middle diameter between 1.5mm and 3.5mm.

[0033] A zinc-aluminum alloy metal coating is applied to the drawn steel wire, the aluminum content in the coating being 0.2 wt%. This coating operation is best done in a hot-dip process in which the steel wire is passed through a bath of molten zinc-aluminum alloy. The coating weight on the semi-finished steel wire is 70g / m 2 up to 200g / m 2 .

[0034] Then, the coated semi-finished steel wire...

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Abstract

A steel fiber adapted for the reinforcement of a cementitious matrix is provided with a zinc aluminium alloy coating. The coating includes 0.05-0.5 wt% of aluminium, with the remainder being zinc and unavoidable impurities. The small amount of aluminium delays the growth of the alloy layer and delays the appearance of brown rust stains on the surface.

Description

technical field [0001] The present invention relates to coated steel fibers for strengthening cementitious matrices. Background technique [0002] It is known that steel fibers can be used to strengthen cementitious matrices such as concrete or mortar. [0003] Due to the alkaline nature of concrete and mortar, corrosion protection of these steel fibers is not necessary in many cases. However, in some other cases, the steel fibers are close to the surface of the cement matrix being reinforced, or the steel fibers are exposed to the elements before being mixed into the cement matrix, and corrosion problems may arise. [0004] WO-A1-2006 / 067095 discloses zinc-coated metal elements, such as zinc-coated steel fibers for strengthening cementitious matrices. In order to prevent the generation of hydrogen gas, a mixture is provided at the interface of the zinc-coated metal element and the cementitious matrix, said mixture being selected from the group consisting of imidazoles, tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/48
CPCC04B14/48C04B28/04C04B2103/0077C04B20/0012C04B20/1062C04B14/06C04B14/28
Inventor F·范赫W·范登布鲁克B·阿拉尔特J·斯托帕卡
Owner NV BEKAERT SA
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