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Shrinkage-Reducing Additives
Technology for high-performance, dimensionally stable and sustainable concrete and mortar systems.
- Controlled Expansion
- Reduced Cracking Risk
- Durable Density
- Industrial Floors & Tunnels
- Precise Volume Stability
CSA EXPANSIVE ADDITIVE FOR CONCRETE AND MORTAR
DENKAPOWER CSA®TYPE-S
CSA expansive additive for shrinkage compensation in concrete and mortar
Denka Power CSA Type-S is a highly effective calcium sulfoaluminate additive for cement-bound mortar and concrete systems. Through the formation of ettringite and calcium hydroxide, a controlled expansion develops within the binder system. This can counteract hydraulic and drying shrinkage, reduce the tendency to crack and support dimensional stability.
As the high-performance successor to Denka CSA 20, Power CSA Type-S delivers a comparable shrinkage-compensating effect at a lower dosage. The specific dosage and suitability must be validated for each binder system by preliminary trials.
Controlled expansion
Ettringite formation generates a targeted volume increase within the binder system.
Shrinkage compensation
Counteracts hydraulic and drying shrinkage and can reduce the tendency to crack.
Efficient dosage
Typical dosage of 3–5 % by weight of cement.
For mortar and concrete
Suitable for repair mortars, self-levelling systems, industrial floors and high-density concretes.
Engineered for shrinkage-compensated mortar and concrete systems: repair mortars, self-levelling floor and levelling compounds, surface coatings, industrial floors and high-density concretes.
Working principle
Formation of ettringite and calcium hydroxide for controlled expansion and shrinkage compensation.
Typical dosage
3–5 % by weight of cement. Match dosage to binder and target profile by preliminary trials.
Application testing
Dosage and suitability are to be matched to binder, mix design and target requirements through preliminary trials.
Compatibility
Suitable for Portland cement and hydraulic binders, including GGBS, fly ash and calcium hydroxide.
CSA
Calcium Sulfoaluminate
3–5%
Dosage by cement mass
Ettringite + Ca(OH)₂
Working principle
Preliminary trials
Mix design matching
High-performance successor to Denka CSA 20
Denka Power CSA Type-S is the high-performance successor to Denka CSA 20. In Denka mortar measurements a comparable shrinkage-compensating effect, a comparable 28-day compressive strength and equal or better flow retention were achieved at approximately 80 % of the Denka CSA 20 dosage. The exact replacement dosage must be established for each binder system and mix design by laboratory trials.
Relative dosage for a comparable effect
- Denka CSA 20
- 100 %
- Denka Power CSA Type-S
- approx. 80 %
Shrinkage compensation
- Denka CSA 20
- Reference
- Denka Power CSA Type-S
- Comparable*
Compressive strength after 28 days
- Denka CSA 20
- Reference
- Denka Power CSA Type-S
- Comparable*
Flow retention
- Denka CSA 20
- Reference
- Denka Power CSA Type-S
- Equal or better*
*Comparison values are based on Denka measurement examples for dry mortar according to the stated JIS test bases. They are for guidance and do not represent guaranteed product properties. Any switch and dosage adjustment must be validated by preliminary trials.
Note: The stated values are typical reference values and not guaranteed product properties. Suitability and dosage must be validated for the respective binder system, mix design and target requirements by application-specific preliminary trials. Overdosage may lead to over-expansion, strength loss, increased porosity and reduced frost resistance.
NAMEX® Series
The Namex® Series comprises reactive mineral additives for the reduction of shrinkage deformations in cement-bound mortar and concrete systems. Through reaction with mixing water a controlled volume increase develops, which can counteract shrinkage in the hardening binder system. Depending on the product, the focus lies on the reduction of thermal shrinkage, on a mild expansion or on a CaO-/MgO-based reaction system.
Namex® XA
Thermal shrinkage reduction
Mineral additive for the reduction of thermal shrinkage in cement-bound building materials.
Namex® XC
Shrinkage reduction through mild expansion
Mineral additive for the reduction of shrinkage in cement-bound mortar and concrete systems.
Namex® MOX
CaO-/MgO-based shrinkage reduction
CaO-/MgO-based mineral additive for the reduction of shrinkage in cement-bound systems.
*Namex® XC and Namex® MOX: 2–4 %; Namex® XA: 3–6 % – each by weight of cement.
Newchem AS Series
Reactive powder additives for cement-bound mortar and concrete systems. Through controlled early ettringite formation they generate a targeted expansion that can counteract early shrinkage deformations and reduce the tendency to crack. Depending on the product, the focus lies on strength development, shrinkage reduction or a higher expansion level.
Newchem AS A27
Strength development · Shrinkage compensation
Reactive additive supporting strength development with an additional shrinkage-reducing effect.
+50–70 % strength after 28 days*
Newchem AS A28
Shrinkage reduction · Moderate early expansion
Shrinkage-reducing additive with moderate early expansion for cement-bound systems.
~15 % less shrinkage*
Newchem AS A29
Expansive additive · High expansion level
Expansive additive for cement-bound mortar and concrete systems with pronounced shrinkage compensation.
~21 % less shrinkage*
*Typical laboratory results or recommended reference values. The achievable effect and the required dosage depend among other things on cement type, binder system, mix design, water-to-binder ratio, processing and curing. Application-specific preliminary trials are required before each use.
Technical data, dosage guidance and application-specific advice on Newchem AS A27, AS A28 and AS A29 are available on the respective product pages or on request.