Rapid Set Cement (High early and Final strength)

Product Specifications

Prod Model:	CSA binder
Markets:	North America,South America,Eastern Europe,Southeast Asia,Africa,Oceania,Mid East,Eastern Asia,Western Europe
Function:	Special Cement
Mineral Composition:	Sulphate Aluminium Cement
Color:	Grey
Hardening Feature:	Rapid Hardening
Heat Of Hydration:	Moderate Heat
Type:	CSA Cement
Strength Grade(',Mpa):	32.5-92.5

Product Description

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.
Properties
Incorporation of Calcium Sulpho Aluminated Cement into a variety of mix designs, CSA Cement products exhibit a range of properties, like:

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.

Fineness
Usual range: 400(+/-20) m2/kg, Specification limit: >360 m2/kg;
Usual range: ≥ 480 m2/kg, Specification limit: >450 m2/kg.


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 ≥ 60.0≥ 50.0≥ 50.0
3d ≥ 85.0≥ 75.0≥ 65.0
7d ≥ 95.0≥ 85.0≥ 75.0
Setting time Initial ≥ 25min ≥ 25min ≥ 25min
Final ≤ 300min ≥ 300min ≥ 300min

Applications
These properties are applied to obtain a wide range of products:
Rapid repair mortars
Fast setting tile adhesives
Fast setting tile grouts
Shot-crete / Gun-nite
External renders
Self smoothing mortars
Self leveling mortars
Anchor bolt grouts
Non shrinking grouts, etc.

Use of Additives
CSA Cement 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.