1. Cracks in the concrete
Cracking is generally the first sign of distress in concrete. Cracking can occur in both hardened and fresh, plastic, concrete as a result of volume changes and repeated loading.
The cracks make the concrete and the structure more vulnerable to external effects and can immediately reduce the mechanical resistance of the structure. Cracks reduce the ability of a structure to absorb stress and can lead to collapse.
When it comes to rebar reinforcement… at times it can shift out of position when the concrete is being poured and therefore it does not get proper cover. If there is no cover or improper cover then the rebar may be exposed to excessive moisture and rust which causes concrete cracking.
Our Spajic® steel fibers are made of wire of different materials, which is designed to prevent cracking of concrete and increases the resistance of concrete to the formation of surface cracks. They have the function to reduce and/or eliminate the cracking of concrete in the early and late stages. Steel fibers are sometimes referred to as structural fibers and are intended to carry a load, and are therefore used as a replacement for conventional reinforcement.
2. Lack of materials, workforce and construction time
When compared, steel fibers require 3.9kg/m2 of material usage while rebar requires 6.1kg/m2 therefore you will require less material.
As for implementation and dosing of the reinforcement, only one person is able to work with steel fibers with no issues – which is not the case in other ways of reinforcement.
Last but not least, construction time is significantly decreased when using steel fibers. It eliminates the need for steel fabrication, handling and placement.
3. Difficulties with uniformity of the concrete
Uneven concrete slabs should be repaired for reasons of both convenience and safety.
When using steel fibers for concrete reinforcement, you are at no risk of uneven concrete as the steel fibers provide even concrete support and is easy to use.
4. Your concrete is at flood-risk, high temperature risk places
Too little concrete cover allows the water to penetrate and react with steel rebars causing concrete to crack. Steel rebars exposed to water rusts along the entire length and reduces the strength of reinforced concrete.
Also, when exposed to high temperatures, rebar has tendency to melt/deform.
When using steel fibers, you lower your risks of rusting and in cases if the steel fiber does begin to rust – it does not spread along the whole construction. Fiber reinforced concrete was found to have better fire resistance and inclusion of steel fibers in concrete reduces the amount of strength loss due to heating.