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Sika Sikacrete 421 CI Rapid 65lb Bag 537630

One-component, early strength-gaining concrete containing factory blended coarse aggregate. For use as a structural repair material for parking facilities, industrial plants, walkways, bridges, tunnels, dams and balconies.

  • Fast-Setting
  • High Early Strength
  • Excellent Workability
$27.42
SKU
18926

Sika Sikacrete 421 CI Rapid – High-Early-Strength Concrete Repair

Sika Sikacrete 421 CI Rapid is a high-performance, one-component concrete designed for fast-setting, high-early-strength applications. It contains factory-blended coarse aggregate, eliminating the need for field extension, and includes an integral corrosion inhibitor for added durability. This prepackaged concrete is ideal for full-depth repairs in bridges, tunnels, industrial floors, and parking structures. Sikacrete 421 CI Rapid meets ASTM C-928 Type R3 rapid-hardening concrete standards, ensuring quick strength gain and excellent workability. Its air-entrained formulation enhances freeze-thaw resistance, making it suitable for various environments.

Key Features:

  • One-component, ready-to-use formulation
  • High early strength for rapid repairs
  • Prepackaged coarse aggregate eliminates field extension
  • Integral corrosion inhibitor for reinforced concrete protection
  • Excellent workability and easy finishing
  • Suitable for full-depth repairs and large void filling
  • Freeze-thaw resistant for long-term durability
  • Complies with ASTM C-928 Type R3 rapid-hardening concrete

Technical Specifications:

Property Value
Compressive Strength (2 hours) 3,000 psi (20.7 MPa)
Compressive Strength (1 day) 5,000 psi (34.5 MPa)
Compressive Strength (7 days) 6,000 psi (41.4 MPa)
Compressive Strength (28 days) 6,500 psi (44.8 MPa)
Flexural Strength (28 days) 1,000 psi (6.9 MPa)
Splitting Tensile Strength (28 days) 650 psi (4.5 MPa)
Shear Strength (1 day) 1,700 psi (11.7 MPa)
Shear Strength (7 days) 2,300 psi (15.9 MPa)
Shear Strength (28 days) 3,000 psi (20.7 MPa)
Shrinkage (Water Cured) 0.012%
Shrinkage (Air Cured) -0.016%
Coverage 0.5 ft³ per bag
Layer Thickness 1" (25 mm) – 8" (203 mm)

Frequently Asked Questions:

What applications is Sikacrete 421 CI Rapid best suited for?
It is ideal for structural repairs in bridges, tunnels, industrial floors, and parking structures, as well as for full-depth concrete repairs and large void filling.

How long does Sikacrete 421 CI Rapid take to cure?
It achieves 3,000 psi compressive strength in just 2 hours, 5,000 psi in one day, and 6,500 psi at 28 days.

Can this product be used in freeze-thaw conditions?
Yes, its air-entrained formulation enhances durability and freeze-thaw resistance.

More Information
BrandSika
ManufacturerSika