CSA Cement Pure Clinker Powder Form

CSA Binder-CSA cement clinker powder based on Calcium Sulfoaluminate cement.


CSA Binder is not a finished cement, but rather a pure Calcium Sulfoaluminate (CSA) clinker, serving as the precursor to CSA-based cements. Some clients may refer to it as a CSA additive; however, it is more accurately described as a hydraulic, cementitious mineral blend rich in C4A3S (calcium sulfoaluminate) crystalline phases.

When blended with Portland cement and gypsum (or anhydrite), CSA Binder enables the formation of a rapidly developing, high-strength cementitious matrix.

This binder is specifically designed for use in dry-mix mortar formulations requiring:

• Fast setting
• Rapid hardening
• High early and ultimate strength
• Freeze resistance
• Low permeability
• Corrosion resistance
• Low pH
• Low drying shrinkage
• Controlled micro-expansion

Importantly, the rapid setting and early strength characteristics of CSA Binder are not related to Calcium Aluminate Cement (CAC). Although both materials contain high levels of aluminum oxide, CAC is a refractory cement with a fundamentally different microstructure and hydration mechanism.

In blended systems, CSA acts as a reactivity enhancer (or accelerator-like component) within Portland cement mixtures. Increasing CSA dosage leads to higher early strength, but also significantly reduces setting time, as CSA systems are inherently fast-setting. To manage workability, chemical retarders or set modifiers are often incorporated.
 

Properties
Hydraulic Properties
The characteristics of CSA Binder have been tested in accordance with the Chinese
standards: GB20472-2006.
Setting time determined at 20ºC, using Vicat needle according to GB/T 1346-2001.
Mechanical strength at 20ºC, 95% relative humidity according to GB20472-2006 .

Specification Limit:
Initial Setting time > 10 Min Final Setting time < 350 Min
 

Reactivity with Portland Cement

CSA Binder can be used in combination with various mineral components, including Portland cement, calcium sulphates, and fillers, as well as with organic materials such as polymer latexes or redispersible polymer powders.

Depending on the formulation and processing technology, CSA Binder enables the adjustment and control of key performance properties.

The behavior of Portland cement in such systems can vary significantly. In general, the rate of setting acceleration increases progressively with higher additions of CSA Binder. However, the dosage required to achieve a specific setting time depends strongly on the source and composition of the Portland cement, and can be further modified through the use of chemical additives.

The strength development of CSA Binder blended with Portland cement and/or calcium sulphates is also influenced by the nature of these components. Typically, these systems develop mechanical strength at a very early stage (within a few hours).

For certain types of Portland cement, especially when combined with additives that regulate setting and hydration, the long-term performance of the blend can be comparable to that of conventional Portland cement. Nevertheless, it is essential to evaluate compatibility and performance for each specific cement source.

Key Portland cement characteristics to consider include:

• C3A (tricalcium aluminate) content
• Type and dosage of mineral admixtures
• Type of calcium sulphate used

Additionally, chemical additives play a critical role in influencing:

• Setting time
• Rheology (workability and flow behavior)
• Mechanical performance

Chemical Analysis Data
The chemical analysis of CSA Binder has been determined according to the following:
GB/T 176-1996 Methods of chemical analysis for cement
Main Constituents (%)
SiO2       Al2O3     Fe2O3     CaO    MgO    TiO2       SO3
Specification Limit
CSA-72.5 ≤ 10.5 ≥ 34.0 1.5-3.5 41.5-43.5 ≤ 3.5 1.0-2.0 7.5-9.5
CSA-82.5 ≤ 8.5 ≥ 35.0 1.5-3.5 40.5-42.5 ≤ 3.5 1.0-2.0 8.0-10.0
CSA-92.5 ≤ 7.0 ≥ 36.0 1.5-2.5 40.0-41.5 ≤ 3.5 1.0-2.0 8.5-11.0

Fineness
Specific Surface Area: according to standard GB/T 8074-2008:
Usual range: 360~430 m2/kg, Specification limit: >360 m2/kg;
Usual range: 450~500 m2/kg, Specification limit: >450 m2/kg.

Applications
These properties are applied to obtain a wide range of products:
Fast setting cements/concrete
Rapid hardening mortars
Tile adhesives
Self-leveling compounds
Non-shrink grouts
Concrete repairs,
Water stopping mortars
etc.

With a careful selection of the constituents (OPC, calcium sulphates, additives), it is
possible to create mixes with a range of different hydraulic properties:
Adjustable setting time
Rheology adapted to the application
High early strength
High long term strength
Shrinkage compensation

Use of Additives
CSA Binder may be used in combination with chemical additives such as:
polymers, either in latex form or redispersible powder form
Defoamers
Retarders
Accelerators
Plasticizers/superplasticizers
Rheology modifiers
Fibers,etc

Storage:
CSA BINDER is normally supplied in one-tonne bag which include a moister resistant barrier. However, in common with all hydraulic binders CSA BINDER must be kept from moisture, and can retain its properties for up to six months when properly stored.