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CSA Cement (62.5,72.5,82.5,92.5)

Introduction
CSA Cement, also named Calcium Sulpho Aluminate Cement with grade: 42.5, 52.5, 62.5, 72.5, 82.5, 92.5, is a hydraulic binder based on calcium sulpho aluminate, rather than calcium aluminates which are the basis of Calcium Aluminates Cement or calcium silicates which are the basis of Portland Cement. It can be used on its own (with a Lithium accelerator), or with an Anhydrite, Portland cement mix, Metakaolin or a combination of all.

CSA Cement has the benefit of being readily adaptable to suit many different applications where both rapid set and / or high early strength gain are required. It yields controlled set, enhanced early strengths, shrinkage compensation or expansion and sulphate resistance. Uses include any cement-based product in need of these properties. CSA Cement products exhibit a range of properties to suit a wide spectrum of cement-based applications, like fast setting cements, self-leveling or self-smoothing compounds, self compacting concrete,rapid hardening mortars, tile adhesives, non-shrink grouts, water stopping mortars, repair mortars, high early strength concrete, GRC, etc.

Within CSA (Calcium Sulpho Aluminate) Cement Ettringite formation is typical. Ettringite is an expansive crystalline substance formed when sulphate reacts with tri-calcium aluminate (C3A) and calcium hydroxide (Ca(OH)2). It occupies twice the volume of the original compounds so an expansion occurs. In the CSA Cement, 85% of ettringite is developed at a very early stage in the process, before the aluminates and silicates start to hydrate. The risk of late ettringite formation is very limited and the ettringite which is formed is very stable over time. This is the fundamental difference between CSA and CAC (Calcium Aluminate Cement) Cement.

Be it a mortar or a concrete, making a composite cement which exhibits rapid setting, high early strength development, with little or no loss of late strength, no risk of conversion or late formation of ettringite. Depending on the level of addition of calcium sulphate, either shrinkage compensation or positive expansion can also be controlled.

Potential advantages of the CSA Cements are low CO2 emissions, improved sulphate resistance, low permeability, enhance durability and a good workability at low temperatures.

CSA Cement 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.
Properties

 Incorporation of Calcium Sulpho Aluminated Cement into a variety of mix designs, CSA Cement products

 exhibit a range of properties :

 •    Rapid Set

 •    Adjustable Setting Time

 •    High Early Strength

 •    Increased strength in time

 •    Minimal Shrinkage

 •    Shrinkage compensation

 •    Expansion

 •    Sulphate Resistance

 •    Reduced Alkalinity

 •    Low CO2Emissions

 •    Rheology Adapted to the Application

 •    etc.

  • Data

     

    Chemical Analysis

    The chemical analysis of CSA Cement has been determined according to the following:

    GB/T 176-1996 Methods of chemical analysis for cement

     

     Main constituents (%)

    Component

             Type I

    Type II

          Type Ⅲ

    Type Ⅳ

    Type Ⅴ

    SiO2

    ≤7.0

    ≤8.5

    ≤10.5

       

    Al2O3

    ≥36

    ≥35

             ≥33

    ≥32

    ≥28

    Fe2O3

    1.5-2.5

    1.5-3.5

    1.5-3.5

       

    CaO

    40.0-41.5

    40.5-42.5

    41.5-43.5

       

    MgO

    ≤ 3.5

    ≤ 3.5

    ≤ 3.5

       

    SO3

    8.5-11.0

    8.0-10.5

    7.5-9.5

       

    TiO2

    1.0-2.0

    1.0-2.0

    1.0-2.0

       

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

    Fineness

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

    Specification limit: ≥460 m2/kg.

     

    Mineral composition

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

    −Principal mineral phase: calcium sulphoaluminate C4A3S-

    −Secondary phases: C2S, C4AF

    Notes: This information is given for reference only.

     

    Hydraulic Properties

    The characteristics of CSA Cement 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 .

     

    Item

              Type I

            Type II

          Type III

          Type Ⅳ

    Type Ⅴ

    Bending Strength

    (Mpa)

    1d

    ≥8.0

    ≥7.0

    ≥6.0

     

     

    3d

    ≥10.0

    ≥9.0

    ≥8.0

     

     

    7d

    ≥11.0

    ≥10.0

    ≥9.0

     

     

     

    Compressive strength

    (Mpa)

    1d