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Steel fiber is added to concrete to improve its tensile, bending, impact resistance and crack resistance. Correct mixing method is the key to ensuring the uniform dispersion of fibers.
Step 1 - Mixing sequence: the steel fiber can be added together with the coarse aggregate in the mixer, or spread on the belt before the aggregate enters the mixer, so that the fiber is fully mixed with the aggregate.
Step 2 - Mixing time: the mixing time should be appropriately extended (generally more than 60 seconds) to ensure the fibers are evenly dispersed. If the fibers are found to be clustered, extend the mixing time or adjust the adding method.
Step 3 - Dosage control: the steel fiber dosage is generally 20-80 kg per cubic meter of concrete according to the design requirements. Too much fiber will affect the workability, and too little cannot achieve the reinforcement effect.
Step 4 - Pouring and vibration: after mixing, the steel fiber concrete should be poured and vibrated in time to avoid fiber settlement. The surface should be finished with a power trowel to make the fiber surface treatment.
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