Superior CSA Expander Vs. Traditional Cao-Based Agents

• Customization: Available
• Grade Standard: Industrial Grade
• Transport Package: 25kg/Bag
• Model NO.: EX-3
• Specification: bag
• Trademark: JUFU
• Origin: China
• Production Capacity: 50000mt/Year

Product Description

Product Description:

A high-performance calcium sulfoaluminate (CSA)-based expansive agent designed to compensate for drying shrinkage and thermal contraction in cementitious materials. It generates controlled expansion during hydration, enhancing concrete durability by preventing cracks in critical structures. Ideal for projects requiring dimensional stability and watertightness.

 

Specifications

  

 

Parameter	Value	Test Method
Expansion Rate	0.05%~0.15% (7d)	GB/T 23439-2017
Setting Time	Initial: 30-60 min, Final: ≤4 hrs	ISO 9597
Compressive Strength	≥25 MPa (7d)	ASTM C109
Alkali Content	≤0.5% (Na2Oeq)	GB/T 176
Particle Size	80-120 μm (D50)	Laser Diffraction
Loss on Ignition	≤3.0%	GB/T 5484

 

Application

 

1. Concrete Structures

• Waterproofing: Basements, reservoirs, swimming pools.

• Infrastructure: Bridges, tunnels, high-speed rail tracks.

• Repair: Crack injection grouts, patch mortars.
   

2. Precast & Prestressed Concrete

• Pipes/Panels: Prevents shrinkage cracks during steam curing.

• Post-Tensioning Ducts: Ensures full grout expansion.
   

3. Special Environments

• Sulfate-Rich Areas: Marine structures, sewage plants.

• Low-Temperature: Accelerates setting in cold weather.

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  Usage Guidelines

   

  Dosage Recommendation:

• General Concrete: 8-12% of cement weight.

• Restrained Structures (e.g., slabs): 10-15%.

• Grouts/Mortars: 6-10%.
   

  Mixing Method:

• Dry Mixing: Blend with cement & aggregates first.

• Water Addition: Adjust w/c ratio by ±5% for workability.

• Curing: Standard moist curing (≥7 days).
   

  Compatibility:

• Cements: Works with OPC, slag cement, fly ash blends.

• Admixtures: Avoid clash with CaCl2-based accelerators.

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Package and storage

 

• Packaging:

  • 25 kg multi-layer kraft paper bags (moisture-proof).

  • 1-ton jumbo bags.
     

• Storage:

  • Keep dry (<50% humidity) at 5-30°C.

  • Shelf life: 12 months (unopened).

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  Our Advantages

   

  -- Faster Expansion: 70% of total expansion within 72h (vs. 7d for CaO types).
  -- No Delayed Swelling: Avoids destructive late-stage expansion.
  -- Sulfate Resistance: Ideal for marine/underground structures.