Calcium Magnesium Composite Shrinkage Reducing Admixture is an advanced concrete expansive agent that provides staged expansion to compensate for shrinkage, ensuring zero-shrinkage, crack-resistant structures with enhanced durability for large-scale applications.
Staged Shrinkage Compensation
Crack Risk Minimization
Superior Durability Strength
Shrinkage Compensation in Mass Concrete
Product Introduction
Calcium Magnesium Composite Shrinkage Reducing Admixture is an advanced concrete expansive agent ideal for large-volume concrete pours (≥500mm thick), such as tunnels, dams, basements, subways, reservoirs, and airport runways, where it delivers staged expansion to compensate for shrinkage and prevent cracks.
Why Choose Calcium Magnesium Composite Shrinkage Reducing Admixture for Large-Scale Concrete Construction?
Tailored Shrinkage Compensation: Aligns with concrete's temperature and shrinkage history for precise, full-process inhibition.
Early & Late-Stage Expansion: Uses calcium-based components for initial self-shrinkage offset and magnesium oxide for drying shrinkage control, achieving zero-shrinkage results.
Pre-Compressive Stress: Creates stress in restrained conditions to minimize cracking risks in massive pours.
Enhanced Durability: Boosts long-term structural integrity with superior strength and performance in demanding projects.
Standards Compliance & Efficiency: Meets T/CECS 10082-2020, with a cost-effective 6-10% dosage for optimal results.
Q: How does CMCE compare to shrinkage-reducing admixtures (SRA)?
A: SRAs lower surface tension but don’t actively expand. CMCE provides positive volume increase (0.025% min. per ASTM C845) for guaranteed crack closure.
Q: Can CMCE replace joint fillers in slabs-on-grade?
A: Yes! At 8% dosage, it enables jointless slabs up to 40m x 40m (per ACI 360R design).
Q: Is special curing required?
A: Standard moist curing (7d) is sufficient. No membrane curing needed.
Product Parameters
| Inspection Item | Index Requirement | Type I | Type II | Details/Notes |
|---|---|---|---|---|
| Specific Surface Area (m²/kg) | ≥250 | ≥250 | ≥250 | Ensures fine particle distribution for effective expansion |
| Residue on 1.18mm Square Hole Sieve (%) | ≤0.5 | ≤0.5 | ≤0.5 | Low residue for smooth mixing |
| Moisture Content (%) | ≤1.0 | ≤1.0 | ≤1.0 | Maintains product stability |
| Initial Set (min) | ≥45 | ≥45 | ≥45 | Controlled setting for workability |
| Final Set (min) | ≤600 | ≤600 | ≤600 | Prevents premature hardening |
| 7d in 20°C Water Expansion Rate (%) | - | ≥0.035 | ≥0.050 | Early expansion for shrinkage compensation |
| 21d in 20°C Air Expansion Rate (%) | - | ≥-0.010 | ≥-0.010 | Late-stage stability |
| Δε | - | ≥0.015, ≤0.060 | ≥0.015, ≤0.060 | Balanced expansion rate |
| 7d Compressive Strength (MPa) | ≥22.5 | ≥22.5 | ≥22.5 | High early strength |
| 28d Compressive Strength (MPa) | ≥42.5 | ≥42.5 | ≥42.5 | Long-term durability in concrete |
Product Usage
Calcium Magnesium Composite Shrinkage Reducing Admixture excels in concrete shrinkage compensation for large-scale projects. Applications include tunnels, basements, underground engineering, water conservancy, hydropower, ports, reservoir dams, subway waterproofing, airport runways, terminals, sports venues, and ultra-long structures ≥500mm thick.
Usage Guidelines:
Mix at 6-10% of binder weight; test for project-specific needs.
Ensure even distribution for optimal magnesium oxide expansive agent performance.
Apply in restrained conditions to generate pre-compressive stress.
Key Benefits in Use: Achieves zero shrinkage, prevents cracks, and supports hydration and expansion in concrete. Follow GB50119-2013 and JGJ/T178-2009 standards.
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Our products have undergone rigorous testing at our national testing laboratory (CABR testing center co., ltd). Renowned Fortune Global 500 firms such as China Railway Group Limited, China Communications Construction Company Limited, and Sinohydro are among our esteemed clients.
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