CSA Expansive Agent
CSA-Based Expansive Agent for Shrinkage-Compensated and Watertight Concrete
CSA Expansive Agent is used in shrinkage-compensated concrete, watertight concrete, post-poured strips, grout and mortar systems where dimensional stability and curing control are important. It supports basements, tunnels, metro works and underground waterproofing applications.
Product Positioning
- Shrinkage compensation design
- Mortar, grout and concrete systems
- Dosage and curing discussion
- Trial-based technical support
Product Overview
Quick answer: CSA Expansive Agent is a high-efficiency mineral expansive admixture (CaO, calcium sulphate and calcium sulphoaluminate phases) that forms ettringite to deliver a controlled, restrained expansion for shrinkage-compensated concrete, grout and mortar. The product is available in restrained-expansion grades CSA-I / CSA-II / CSA-III with a controlled specific-surface-area minimum of ≥200 m2/kg. Select the grade by its exact restrained-expansion conditions and certificate of analysis; verify dosage, curing and compatibility in the actual cement system.
CSA Expansive Agent is a mineral-based expansive admixture made from calcium sulphoaluminate clinker, calcium oxide and natural anhydrite according to supplied product information. It is used as a component in shrinkage-compensated cementitious systems.
It may support non-shrink grout, repair mortar, waterproof mortar, self-leveling compound and other dry mix systems when dosage, cement system, water amount, additives and curing condition are properly verified. Final performance depends on formulation design, raw materials, water amount, additives, curing condition and application method. Any environmental benefit must be supported by project-specific service-life evidence and verified life-cycle data.
Key Functions
Shrinkage-compensation formulation component
Shrinkage compensation design
Dimensional stability support
Non-shrink grout formulation support
Repair mortar crack-risk reduction approach
Waterproof mortar formulation support
Dry mix mortar component design
Typical Applications
Non-Shrink Grout
Shrinkage-Compensated Mortar
Repair Mortar
Waterproof Mortar
Self-Leveling Compound
Concrete Post-Poured Strips
Anchoring Grout
Dry Mix Mortar Systems
Product Specification
Controlled requirements from the current approved product document. Grade III requires a separate certificate of analysis.
| Item | Specification Requirement |
|---|---|
| MgO | ≤5.0% |
| Total alkali | ≤0.45% |
| Specific surface area | ≥200 m2/kg |
| Residue on 1.18 mm sieve | ≤0.5% |
| Setting time | Initial ≥45 min; final ≤600 min |
| Compressive strength | 7 d ≥22.5 MPa; 28 d ≥42.5 MPa |
| Restrained expansion — CSA-I | Water, 7 d ≥0.035%; air, 21 d ≥−0.015% |
| Restrained expansion — CSA-II | Water, 7 d ≥0.050%; air, 21 d ≥0.000% |
| Restrained expansion — CSA-III | Water, 7 d ≥0.075%; air, 21 d ≥0.020%; separate COA required |
These are specification limits, not batch-typical values or finished-system guarantees. Expansion performance depends on the cement system, dosage, water, additives, curing and test method.
Directions for Use / Formulation Reminder
- Use 7–12% as reference-only internal replacement guidance; establish the final dosage by trial mix for the actual cement or mortar system.
- Provide continuous moist curing for at least 14 days unless the project specification requires longer curing.
- Check compatibility with cement, CSA binder, gypsum source, water reducer, polymer and other additives.
- Control water amount, sand grading, temperature and testing method during trial.
- Avoid application conditions that conflict with supplied temperature or curing recommendations.
Packaging and Storage
Packaging options can be discussed according to order quantity, shipping method and buyer handling requirements. Common options may include 25 kg bags and jumbo bags / bulk bags. Final packaging, palletizing, moisture protection, labeling and export documentation should be confirmed before order. Materials should be stored dry, covered and protected from moisture and rain.
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Shrinkage Compensation Solution
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View SolutionProduct-Specific Questions
Is CSA Expansive Agent a finished grout or mortar?
No. It is an expansive component used in a designed cementitious system. Cement type, dosage, water, reinforcement or restraint and curing determine the measured result.
Is there one dosage suitable for every concrete or mortar?
No. The starting dosage must come from the current datasheet and be verified with the actual cement, supplementary materials, admixtures, water content and curing conditions.
What should be tested before commercial use?
Check workability, setting, strength, restrained or unrestrained expansion as applicable, shrinkage-related performance and durability under the relevant project method.
Discuss CSA Expansive Agent for Your Formulation
Send us your application, target performance requirement, local raw materials, packaging requirement and destination market. We will suggest a suitable product path for sample discussion and testing.
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