Anti-crack and toughening steel fiber and preparation method thereof

Abstract

The invention discloses anti-crack and toughening steel fiber and a preparation method thereof. The anti-crack and toughening steel fiber is composed of two parts, i.e., an internal part and an external part, wherein the external part is steel fiber glued into a cylindrical shape; the internal part is filled with a concrete expansive agent; and two end openings of a cylinder are sealed by a water-soluble adhesive film after the internal part is filled. The anti-crack and toughening steel fiber provided by the invention integrates anti-crack and toughening actions, has good dispersing performance, greatly improves homogeneity of anti-crack performance and toughening performance of concrete, and can mutually compensate the disadvantages of two additives, promote the two additives to play more effectively and fully, and realize the purpose that one plus one is larger than 2.

Description

technical field [0001] The invention relates to steel fibers for concrete, more specifically to a crack-resistant and toughened steel fiber and a preparation method thereof. Background technique [0002] The brittle defects of ordinary concrete seriously affect its service life. Steel fiber is widely used in the field of concrete because of its excellent toughening performance, which improves the durability of concrete, but the improvement of crack resistance and compressive strength requires a large The increase of the fiber content, the increase of the content may lead to the uneven dispersion of the fiber due to agglomeration, which will reduce its anti-cracking and strengthening effect on the concrete. Another way to increase the content is to reduce the fiber content. However, the reduction of fiber aspect ratio will reduce its toughening function of concrete; expansion agent can improve the crack resistance of concrete by compensating shrinkage, but it will affect the ...

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Problems solved by technology

[0002] The brittle defects of ordinary concrete seriously affect its service life. Steel fiber is widely used in the field of concrete because of its excellent toughening performance, which improves the durability of concrete, but the improvement of crack resistance and compressive strength requires a large The increase of the fiber content, the increase of the content may lead to the uneven dispersion of the fiber due to agglomeration, which will reduce its anti-cracking and strengthening effect on the concrete. Another way to increase the content is to reduce the fiber content. However, the reduction of fiber aspect ratio will reduce its toughening function of concrete; expansion agent can improve the crack resistance of concrete by compensating shrinkage, but it will affect the strength of concrete. Cause a certain degree of reduction, the expansion process of most expansive agents is uncontrollable, and the continuous expansion after the anti-cracking effect is completed will cause new material damage risks and affect the durability of concrete

The addition of any of these two concrete additives not only has a single function and limitations, but also increases the amount of addition due to improved performance, resulting in uneven dispersion of the admixture and low efficacy, or even negative effects

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