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Sure CS108 high-performance concrete expansive agent features an expansion rate that aligns with the strength development of concrete. It offers high expansion energy, good stability, reliability, and a low dependence on subsequent water supplementation.
Why Choose Our Shrinkage‑Reducing & Compensating Additive
✅ Synchronized Expansion with concrete strength development-crack prevention for hard‑to‑cure surfaces (walls, slabs)
✅ High Expansion Energy & Stability-no need for extra water curing
✅ Enhanced Durability & Waterproofing-pore structure improved, permeability class≥ P30
✅ Ideal for Mass & High‑Performance Concrete, dam backfill, steel‑tube columns, structural waterproofing
Scope of Application：
1. Suitable for preparing shrinkage-compensating concrete, particularly for crack prevention in hard-to-cure structures like exterior walls and slabs.
2. Applicable for mass concrete and waterproof concrete to control temperature-difference cracks.
3. Ideal for structural self-waterproofing projects, expansive concrete filling works, and cement products.
4. Suited for high-performance concrete, cast-in-pile concrete, steel tube concrete, and dam backfill slot concrete.
Main Technical Properties：
1. High expansion performance with a rapid rate, short stabilization period, and low reliance on later water replenishment.
2. Using this product in shrinkage-compensating concrete yields excellent crack resistance and waterproofing:
- Significantly enhances concrete pore structure and distribution, improving permeability resistance (permeability grade > P30).
- Simplifies construction, enabling continuous construction of ultra-long structures and self-waterproofing of concrete structures.
| Testing Item |
Technical Index |
Test Result |
Magnesium Oxide Content (%) |
≤5 |
2.1 |
Alkali Content (%) |
≤0.75 |
0.35 |
Chloride Ion Content (%) |
≤0.020 |
0.015 |
Fineness |
Specific Surface Area (m²/kg) |
≥200 |
310 |
Residue on 1.18mm Sieve (%) |
≤0.5 |
0.11 |
Setting Time |
Initial Setting (min) |
≥45 |
196 |
Final Setting (min) |
≤600 |
258 |
Restricted Expansion Rate(%) |
|
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Water 7d % |
≥0.050 |
0.058 |
Air 21d % |
≥-0.010 |
0.001 |
Compressive Strength |
7d MPa |
≥22.5 |
34.6 |
28d MPa |
≥42.5 |
50.7 |
Usage and Precautions：
1. Concrete trials should be run in the lab to fix the optimal mix proportion when using this product.
2. Recommended dosage is as follows: suitable for concrete strength grades C25 - C40. For grades above C40, increase the expansive agent dosage or take steps to reduce early-age strength.
Restricted Expansion Rate (%) |
Dosage （kg/m³） |
0.015-0.025 |
30-35 |
0.025-0.035 |
35-40 |
0.035-0.045 |
40-45 |
3. Do not use in concrete projects where the working temperature stays above 80℃ for long.
4. Construction should follow the Technical Code for Application of Concrete Admixtures GB50119-2013 and the Technical Regulations for Application of Shrinkage-compensating Concrete JGJ/T178-2009.
Package, Transportation, and Storage：
1. Available in 25 kg/ 50 kg bags, bulk & custom packing on request.
2. Shelf life is 180 days. Re-test if expired.
3. Store in a dry place to avoid moisture.
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