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Sika Sikacrete 421 CI Rapid 65lb Bag 537630
Sikacrete-421 CI Rapid is an early-strength repair concrete in a 65 lb bag with factory aggregate and a migrating corrosion inhibitor. It returns formed full-depth repairs to service on a fast schedule.
- Early strength for quick-turnaround structural repairs
- Factory-blended coarse aggregate, ready to mix with water
- Integral corrosion inhibitor for reinforced concrete
$28.26
Sikacrete-421 CI Rapid
Sikacrete-421 CI Rapid is a one-component early strength-gaining air-entrained repair concrete with factory-blended coarse aggregate and an integral migrating corrosion inhibitor. This 65 lb bag (part 537630) places from 1 in to 8 in in one lift, reaches approximately 3,000 psi at 2 hours and 6,500 psi at 28 days, and yields approximately 0.50 cu ft per bag. Mix with 5.5 to 6 pints of clean water for quick-turnaround structural repairs on parking decks, plants, bridges, and balconies.
Key Features
- One-component early strength-gaining concrete with factory-blended coarse aggregate
- Air entrained with an integral migrating corrosion inhibitor
- Rapid hardening as defined by ASTM C928 Type R3
- Compressive approximately 3,000 psi at 2 hours and 6,500 psi at 28 days
- Places from 1 in to 8 in in one lift; yield approximately 0.50 cu ft per bag
- Mix 5.5 to 6 pints of clean water per bag
Applications
- Full-depth structural repairs needing early strength
- Parking facilities, industrial plants, walkways, bridges, tunnels, and dams
- Horizontal slabs and formed vertical or overhead pours or pumps
- Handles void and cavity fills above or below grade
Technical Specifications
| Property | Value |
|---|---|
| Manufacturer | Sika |
| Product | Sikacrete-421 CI Rapid |
| Part no. | 537630 |
| Unit | 65 lb bag |
| Color | Gray powder |
| Chemistry | Early-strength cementitious repair concrete with CI |
| Mix water | 5.5 to 6 pints per bag |
| Layer thickness | 1 in to 8 in |
| Compressive 2 h / 28 day | Approximately 3,000 / 6,500 psi |
| Yield | Approximately 0.50 cu ft per bag |
| Classification | ASTM C928 Type R3 rapid hardening |
Product documents: Sikacrete-421 CI Rapid Product Data Sheet (PDF)
Frequently Asked Questions
What repair jobs suit Sikacrete-421 CI Rapid?
Full-depth structural repairs on parking decks, plants, walkways, bridges, tunnels, dams, and balconies that need early strength and a corrosion inhibitor.
What early strength does Sikacrete-421 CI Rapid reach?
Approximately 3,000 psi at 2 hours, 5,000 psi at 1 day, 6,000 psi at 7 days, and 6,500 psi at 28 days.
What thickness can crews place with Sikacrete-421 CI Rapid in one lift?
From 1 in minimum to 8 in maximum in one lift.
What water dose applies for Sikacrete-421 CI Rapid?
Mix 5.5 to 6 pints of clean water per 65 lb bag.
What chloride permeability does cured Sikacrete-421 CI Rapid show?
Rapid chloride permeability is approximately 600 coulombs at 28 days (very low).
What size is Sikacrete-421 CI Rapid?
The bag is 65 lb, part 537630.
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