CSA Binder

Product Details

General characteristics

CSA Binder is a hydraulic binder based on calcium sulphoaluminate, rather than calcium aluminates which are the basis of Calcium Aluminates Cement or calcium silicates which are the basis of Portland Cement. The difference gives CSA Binder properties particularly suited to formulators of products such as self-leveling or self-smoothing compounds, rapid hardening screeds, tile adhesives, non-shrink grouts, rapid setting and special mortars.

CSA Binder is used in formulated products either as a hydraulic binder by itself or with the addition of calcium sulphates or in combination with Portland cement. The setting time is quicker than that of Portland cement, and it also has a rapid strength development. CSA BINDER does not release free lime during hydration thus eliminates the major cause of efflorescence.

Properties

Setting time:

Initial Setting time > 10 Min Final Setting time < 350 Min

Mineral composition

C=CaO, A=Al2O3, S=SiO2 , F=Fe2O3, S =SO3

−Principal mineral phase: calcium sulphoaluminate C4 A3 S

−Secondary phases: C2S, C4AF

Reactivity with Portland cement

CSA Binder may be used in combination with other mineral products, for example Portland cement, calcium sulphates and fillers, or with organics such as polymers in latex foam or in redispersible foam.

Depending on the type of mixes and technology employed, CSA Binder can be used to obtain and control various properties.

The behavior of Portland cement is vary variable. In general, acceleration of set increases progressively with the addition of CSA Binder. The amount of CSA Binder needed to obtain a specific setting time varies considerably depending on the origin of the Portland cement and performance can be modified with the use of additives.

The strength development of CSA Binder/Portland cement and/or Calcium Sulphates depend on the nature of the Portland cement and/or Calcium Sulphates used. In general these mixes will develop mechanical strength at a very early stage (several hours). With some type of Portland cements and in formulated products containing additives which control the setting and hydration, the long term properties is similar to those of the original Portland cement, however it is necessary to check the behavior of each Portland cement used.

The characteristics of Portland cement to be considered are:

C3A content

Mineral admixture type and content

Type of Calcium Sulphate used

Additives will also influence the properties of these mixes:

Setting time

Rheology

Mechanical performance

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

Rapid hardening mortars

Tile adhesives

Self-leveling compounds

Non-shrink grouts

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