Steel Fibers in Shotcrete

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The Advantage of Steel Fibers in Shotcrete

As fibras TenaBrix® para Shotcrete estão em conformidade com a ASTM C 1116, Standard Specification for Fiber-Reinforced Shotcrete (Especificação padrão para concreto projetado reforçado com fibra) e são usadas especificamente para controlar e mitigar rachaduras por retração plástica, aumentar a durabilidade da superfície e a resistência ao impacto e à abrasão.

Os produtos TenaBrix®, incluindo fibras sintéticas macro/micro, fornecem reforço tridimensional para aplicações acima e abaixo do solo.

Scope of application

Tunnel initial support, slope support, mine tunnel, building reinforcement and other wet/dry spraying concrete projects.

Recommended amount of steel fiber added

Type	Recommended Addition Amount	Fiber Specification Recommendations
Primary tunnel support	25~40 kg/m³	Length 30~35mm, Diameter 0.5~0.75mm
Thin layer repair (<100mm)	35-45 kg/m³	Length 25~30mm
High-impact construction	40-60 kg/m³	Length 35~50mm, End Hook Type

The specific dosage should be verified by trial mixing to meet the requirements of flexural toughness of “steel fiber concrete” (JG/T 472).

Recommended Steel Fiber

Macrofibra sintética de polipropileno

Fibra fibrilada de polipropileno

FAQ

Exposed fibers on the surface of the spray coat

Reason:Improper spraying angle or troweling after final set.
Solution:Adjustment of gun angle; calendering before initial setting

Frequent clogging of pipes

Reason:Fiber clumping or too low a sand ratio.
Solution:Enhance fiber dispersion; increase sand rate 2%~3%

Early cracking

Reason:Uneven fiber distribution or insufficient maintenance.
Solution:Optimize mixing process; cover and maintain within 6h after spraying

Intensity fluctuation >15%

Reason:Metering deviation or uncontrolled water-cement ratio.
Solution:Calibrated fiber scale; strict water control