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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.
| Brand | Sika |
|---|---|
| Manufacturer | Sika |
