Steel Fibers for Residential Slabs

The Advantage of Steel Fibers

Las losas de hormigón residenciales pueden beneficiarse del refuerzo tridimensional que proporcionan las microfibras sintéticas de polipropileno TenaBrix®.

Tanto las microfibras monofilamento TenaBrix® como las microfibras fibriladas TenaBrix® pueden añadirse a los forjados residenciales para aumentar la durabilidad del hormigón y reducir las grietas en aplicaciones exteriores e interiores.

Las microfibras monofilamento TenaBrix®, diseñadas específicamente para ayudar a mitigar la formación de grietas por retracción plástica en el hormigón, permiten que éste desarrolle su integridad óptima a largo plazo y aumentan su robustez.

Microfibras fibriladas TenaBrix® Aumentan la durabilidad de la superficie y la resistencia al impacto y a la abrasión en comparación con el hormigón liso.

Steel Fiber Content in Residential Slabs

Type
Recommended Addition Amount
Fiber Specification Recommendations

General residential floor slabs

20-30 kg/m³

Length 30-50mm, Diameter 0.5-0.75mm

Basement Floating Resistant Floor Slabs

30-40 kg/m³

With end hook type, L/D ratio ≥ 65

Ultra-thin floor slab (≤100mm)

35-45 kg/m³

High strength type (≥1200MPa)

Key requirements:

Uniformity control: give priority to the use of special fiber disperser casting, strictly prohibit artificial throwing;
Strength suitability: concrete grade ≥ C25, fiber tensile strength ≥ 1000MPa;
Economic threshold: the cost-effectiveness needs to be reviewed when the added amount >45kg/m³.

Construction Key Considerations

Concrete Mixing

1.Feeding order: gravel → cement → 60% water → steel fiber (put in 3 batches) → remaining water;
2.Mixing time: forced mixer ≥ 3 minutes, fiber without agglomeration is regarded as qualified;
3.Collapse degree: it should be controlled at 160-180mm, too large easily lead to fiber settlement.

Pouring and Vibrating

1.Layered pouring: single layer thickness ≤ 200mm, vibrating rod fast insertion and slow lifting;
2.Prohibit over-vibration: vibration time ≤ 15 seconds / point, to avoid fiber sinking aggregation;
3.Surface treatment: secondary polishing before initial condensation, pressing into the exposed fiber.

Conservation requirements

1.Moisture preservation and maintenance: cover with plastic film within 6 hours after pouring, continuous maintenance ≥ 7 days;
2.Timing of cutting joints: cut shrinkage joints (depth ≥1/3 slab thickness) when the concrete strength reaches 5MPa.

Aplicaciones típicas:

  • Calzadas
  • Aceras
  • Cubiertas
  • Patios
  • Fundaciones

Synthetic Microfiber Costs in Residential Slabs

Cost analysis: adding 30kg/m³ steel fiber increases the cost by about 40 RMB/m², but saves 25 RMB/m² of rebar tying cost and shortens the working period by 20%;

Life cycle: floor wear resistance is increased by 2 times and crack repair costs are reduced by 60%.

By standardizing the application of monofilament steel fibers, it is possible to achieve a thinning of 10-15% in residential floor slabs, while upgrading the crack resistance level to L-III (crack width ≤ 0.2mm).It is recommended that test blocks be verified before construction to ensure that the fiber dispersion is ≥90%.

Recommended Steel Fiber

FAQ

Surface fiber exposure

This is due to late harvesting timing or insufficient vibration resulting in.
Solution:Mechanical grinding treatment + cement paste covering

Poor localized crack resistance

Causes of uneven fiber distribution or insufficient dosing.
Solution:Drill holes for epoxy slurry + additional fiberglass mesh fabrics.

Insufficient winter construction strength

Fiber bonding failure due to low temperatures.We can add early-strengthening agent + water temperature heated to 40°C

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