Special cement introduction
Special
cements are cements that serve some specific function such as
altering the setting or hardening behavior of a concrete,
producing different colors for architectural effects, imparting
superior workability, imparting water retention and plasticity to
mortars, resisting the penetration of water in walls or
containment vessels or simply reducing the cost of the cementing
agent. This article gives descriptions of the basic
characteristics of certain special cements
and their applications.
Those described include: calcium sulfoaluminate cements, calcium aluminate cements with special setting and hardening properties, cements with special colors (white Portland and buff-colored).
Calcium Sulfoaluminate cement is special cement because of its high-speed bonding, rapid strength development, and a shrinkage reduction. We also called them as CSA Cement in short. Oreworld CSA cements are classified by two types: one is CSA cement and the other is CSA binder which does not add anhydrite but CSA pure clinker powder.
The CSA cements have three grades classified by the strength in three days; CSA42.5, CSA52.5 and CSA 62.5.
Regarding
the CSA binder, there are three grades, too. They are CSA binder
52.5, CSA binder 62.5 and CSA binder 72.5. The CSA binder is pure
CSA clinker powders that without adding anhydrite. Most of the
traders or plants who have their own plants and can mixing the
anhydrite like the CSA binder best because it can save production
and transportation cost.
The
CSA binders can be produced to different types of dry-mix mortars
based on CSA cements. For example, self-leveling mortar, concrete
repair mortar, tile adhesives, no-shrinkage mortar and
etc.
Special cement Characteristics
•
Appearance: light grey
powder
• Early-high strength
• Rapid setting: initial setting time can reach 12~20 minutes
• Tiny expansion and low shrinkage
• Low degree of shrinkage
• Low alkali: PH value is about 11 and lower than Portland cement.
• No rust to steel
• Freeze-thaw resistance
• Impermeability
• Resistance to sulfate
attack
•
Low carbon
footprint
Special cement Application
• Concretes repair (for example bridges, airport runaways and parking apron, etc.)
• Technical Rapid-Setting
Mortars (for example restoration and repairs,
etc.)
•
Self-Leveling Floor
Screeds
• Sprayed Concretes and
Shotcretes
•
Mining Products, for example:
mining roof support materials.
• Plasters & Mortars (i.e.
Joints, Sulfate Resistance, No-Shrinkage,
etc.)
•
Special adhesives, tile
adhesives
• Concrete Precast Products
• Glass fiber reinforced concrete (G.R.C.)
OREWORLD provides Specialty Cement and rapid set csa cement,contact us.
JINRONG B/D NO. 116 XINHUA WEST ROAD, 063000, TANGSHAN, HEBEI, CHINA