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Important considerations to enhance the performance of fibers in concrete

Choosing the right packaging to supply concrete fibers is essential to optimize their utilization

The fibers intended for reinforcing concrete can be supplied in different packaging or presentations, designed to improve their dispersion, facilitate control of dosing in kg/m3, or protect them from external factors.

In designs, a volume percentage of fibers is sometimes estimated in relation to the total volume of concrete. However, when applied on-site or in a plant, fibers are dosed in kg/m3. That’s why, at Rimsa, to streamline control, we offer various packaging options and presentations to simplify counting per m3 and expedite their application in mixers, plants, or trucks.

Furthermore, there are instances where a volume percentage of fibers is estimated in the design concerning the total volume of concrete. Yet, during application on-site or in a plant, the dosing of fibers is done in kg/m3.


The weight of fibers in their final presentation varies depending on their density. For instance, polypropylene macrofibers are supplied in bags weighing 1 to 4 kg, whereas steel macrofibers come in boxes or sacks weighing between 20 and 25 kg. In the case of lighter microfibers, their presentation ranges from 0.5 to 1 kg. Although microfibers are also made of polypropylene, they require a lower dosage.



To save on execution time, water-soluble bags are a suitable option that does not compromise the final quality of the concrete. Similarly, water-soluble rolls applied to some polymeric fibers keep the fibers organized for subsequent dispersion within the truck or mixer.

Likewise, bonded films applied to metallic fibers maintain their order without forming tufts until they come into contact with the concrete. This proposition is particularly advantageous for very long metallic fibers as it enhances their workability.Storage:

Finally, it’s important to note that the use of translucent bags allowing sunlight penetration into synthetic fibers is not recommended.

This precaution aims to prevent fiber exposure to UV rays, as prolonged exposure could lead to a loss of mechanical properties. At rimsa, both bags and individual fiber packaging are made of cardboard instead of transparent films. Additionally, we include the appropriate loading and coloring to prevent any loss of mechanical capacity. This comprehensive approach ensures the preservation of fiber quality and performance over time.

For more information, please contact us at construccion@rimsa.com