PP Fibers For Shotcrete

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PP Fiber for Shotcrete

The Advantage of PP Fibers in Shotcrete

Las fibras TenaBrix® para hormigón proyectado que cumplen con la norma ASTM C 1116, Especificación estándar para hormigón proyectado reforzado con fibras, y se utilizan específicamente para controlar y mitigar el agrietamiento por contracción plástica, aumentar la durabilidad de la superficie, el impacto y la resistencia a la abrasión.

Los productos TenaBrix®, que incluyen macro/microfibras sintéticas, proporcionan un refuerzo tridimensional para aplicaciones tanto sobre el suelo como bajo tierra.

Ámbito de aplicación

In shotcrete, PP fiber can effectively inhibit plastic shrinkage cracks and improve structural integrity, especially for tunnel lining, slope support and other projects.

Cantidad recomendada de fibra de acero añadida

Type of project	Importe de adición recomendado	Recomendaciones sobre especificaciones de fibra
Conventional support	0.9~1.2 kg/m³	12-19mm
High anti-cracking requirements	1.5~2.0 kg/m³	19~25mm
Fireproof concrete	2.0~2.5 kg/m³	25~40mm

Note: The dosage shall be verified by trial mixing and shall not be substituted for structural reinforcement!

Fibra de acero recomendada

Macrofibra sintética de polipropileno

Fibra fibrilada de polipropileno

PREGUNTAS FRECUENTES

How can high fiber resilience be solved?

Check the wind pressure: too high wind pressure leads to rebound, adjust to below 0.5MPa.
Optimize the proportion: add micro-silica powder (3~5%) or cellulose ether to improve the bonding.

What about exposed fibers on the surface of the spray coat?

Adjust the spraying angle to the vertical sprayed surface, and lightly press the surface with a steel trowel before final spraying.
If the mixing amount is >2.0kg/m³, it is necessary to increase the mortar protection layer (≥10mm).

What can I do about fibers causing blocked tubes?

Prevention: Use fibers with an L/D ratio of ≤ 100 (e.g. length 19 mm / diameter 0.03 mm).
Emergency: stop spraying immediately, clean the pipe with high-pressure wind, and strictly prohibit water injection!

Anti-cracking effect is not obvious?

Check the fiber dispersion: take the hardened concrete block and crush it, observe whether the fiber distribution is uniform.
Verify the accuracy of mixing amount: the error of each square of concrete should be <±0.1kg.