CSA BINDER

Introduction
Properties
Data
Application
Method
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Introduction

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.

CSA Binder is manufactured under a strict quality assurance systems GB/T 19001-2000 (i.e. ISO9001:2000) and GB/T 24001-1996 (i.e. ISO 14001:1996)) which accommodates the technical requirements of building chemistry formulators.

CSA Binder is normally supplied in one-ton 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.

The properties of CSA Binder conform to the standards of the manufacturer and to the Chinese relevant standards.

Properties

Hydraulic Properties

The characteristics of CSA Binder have been tested in accordance with the Chinese standards: GB20472-2006.

Setting time determined at 20℃, using Vicat needle according to GB/T 1346-2001.

Mechanical strength at 20℃, 95% relative humidity according to GB20472-2006 .

Initial Set

Final Set

Specification

limit

> 10 Min

< 350 Min

Item		Age
Item		1D	3 D	7 D
Flexural, MPa	72.5	> 6.0	> 8.0	> 9.0
	82.5	> 7.0	> 9.0	> 10.0
	92.5	> 8.0	> 10.0	> 11.0
Compressive, MPa	72.5	> 50.0	> 65.0	> 75.0
	82.5	> 50.0	> 75.0	> 85.0
	92.5	> 60.0	> 85.0	> 95.0

Additional information :

(This information is given for reference only.)

Mineral composition

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

−Principal mineral phase: calcium sulphoaluminate C₄A₃S

−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 redispersiblefoam.

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

Data

Chemical Analysis

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
Usual Range	TypeⅠ	≤ 6.5	≥ 36	1.5-2.5	40.0-41.5	1.5-2.5	1.0-2.0	9.0-11.0
	TypeⅡ	≤ 8.0	≥ 35.0	1.5-3.5	40.5-42.5	1.5-2.5	1.0-2.0	8.5-10.5
	TypeⅢ	≤ 10.0	≥ 33.0	1.5-3.5	41.5-43.5	1.5-2.5	1.0-2.0	8.0-9.5
Specification limit	TypeⅠ	< 7.0	> 36.0	< 3.0	39.5-42.0	< 2.5	< 1.8	8.5-12.0
	TypeⅡ	≤ 8.0	≥ 35.0	≤ 4.0	40.0-43.0	< 2.5	< 2.0	8.0-11.0
	TypeⅢ	8.0-10.0	≥ 33.0	≤ 4.5	41.0-44.0	< 3.0	< 2.0	7.5-10.0

Fineness

Specific Surface Area: according to standard GB/T 8074-2008:

Specification limit: ≥460 m²/kg.

Application
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

Method

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

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