Sợi thép so với cốt thép truyền thống: Loại nào tiết kiệm chi phí hơn?

Why Does Traditional Reinforced Concrete Flooring Crack?

When designing high-performance industrial floors, the debate of Steel Fiber Reinforced Concrete vs Rebar is crucial for ensuring long-term durability. While traditional mesh has been the standard, Bê tông cốt sợi thép (SFRC) is now the superior choice to enhance tensile strength and prevent surface cracking in modern construction.

In traditional concrete flooring, steel reinforcement mesh is distributed in a two-dimensional (2D) plane, which cannot provide effective three-dimensional restraint within the concrete structure.

As a result, two major problems occur:

• The upper layer of plain concrete is prone to surface peeling and spalling
• Once cracks form inside the concrete, they easily propagate to the surface due to the lack of multi-directional reinforcement

This limitation makes conventional reinforced concrete floors vulnerable to cracking, especially in industrial and heavy-load environments.

How Steel Fiber Concrete Solves Cracking Problems

Steel fiber reinforced concrete (SFRC) replaces traditional rebar mesh with a three-dimensional (3D) reinforcement system.

Instead of a flat reinforcement layer, steel fibers are evenly distributed throughout the entire concrete matrix, forming a spatial support structure.

This provides:

• Full-directional restraint against internal stress
• Improved tensile strength and crack resistance
• Better load distribution

As a result:

• Surface layer peeling is significantly reduced
• Internal cracks are effectively controlled and prevented from expanding

👉 Nói một cách đơn giản:
Steel fibers make cracks “have nowhere to go.”

Definition of Steel Fiber Reinforced Concrete

According to the standard JG/T472, steel fiber reinforced concrete is defined as concrete with uniformly distributed steel fibers added in appropriate amounts.

These randomly distributed fibers help:

• Prevent micro-crack development
• Control macro-crack formation
• Improve tensile strength, flexural strength, impact resistance, and fatigue performance

SFRC also offers better ductility and durability compared to traditional concrete.

Key Materials and Performance Requirements

Steel fiber concrete is composed of:

• Steel fibers
• Cement
• Aggregates
• Water
• Admixtures and mineral additives

To ensure optimal performance:

• Steel fibers must have high tensile strength and elastic modulus
• The mix design should provide good workability and cohesion
• Fiber distribution must be uniform

According to standards, SFRC strength grades typically range from C20 to C100.

Construction Process of Steel Fiber Concrete Flooring

1. Base Preparation

• Clean and level the base surface
• Remove protrusions to avoid stress concentration
• Install plastic film to:
  • Prevent moisture loss
  • Act as a vapor barrier
  • Reduce base restraint and cracking risk

2. Isolation Joints Setup

• Set isolation joints around walls and columns
• Prevent edge cracking and stress concentration
• Install load transfer bars at construction joints
• Combine with armour joints for joint-free flooring solutions

3. Concrete Placement

• Steel fiber concrete can be poured by truck discharge or pumping
• Due to reduced flowability, longer vibration time is required

Recommended method:

• Use laser screed machine for leveling
• Ensure no air bubbles and proper slurry formation
• Maintain ~2mm surface layer to prevent fiber exposure

4. Wear-Resistant Surface Treatment

• Apply dry shake hardener during initial setting stage
• Ensure even distribution
• Use power trowel and finishing machines for polishing

5. Curing and Joint Cutting

• Cover and cure for at least 14 days
• Apply curing compound to prevent moisture loss
• Cut expansion joints at 1/3 depth of slab thickness
• Maintain moisture during cutting process

Proper curing ensures maximum strength and durability.

Why Choose Steel Fiber Concrete for Industrial Floors?

Compared with Steel Fiber Reinforced Concrete vs Rebar, SFRC offers:

• Superior crack resistance
• Tuổi thọ cao hơn
• Reduced maintenance cost
• Better performance under heavy loads

It is widely used in:

• Industrial plants
• Kho hàng
• Trung tâm logistics
• Heavy-duty flooring systems

Steel Fiber Reinforced Concrete can significantly improve crack resistance and durability.
👉 Learn more about our Hooked End Steel Fiber for high-performance applications.

For technical specifications and global standards on fiber reinforcement, you can refer to the American Concrete Institute (ACI) guidelines.