From Properties of Cement and Cementing Materials

Special Cements

Certain types of cements used for specific requirements are called special cements. These cements can be used at very high or very low temperatures. Some special cements can also be used in acids. Special cements such as silicate cement have a very high setting rate. Barium and strontium cements are resistant to radioactive radiations. The different types of special cements are high alumina cement, sorel cement, silicate cement, waterproof cement, high early strength cement, barsium, and strontium cement.

High Alumina Cement

High alumina cement is obtained by fusing limestone and bauxite with small amounts of silicon oxide and titanium oxide at I500 C-1600 C in a rotatory kiln, and then grinding the resulting products to fineness in the same method as that used of Portland cement. The essential constituents of high alumina cement are:

  • Calcium Oxide (CaO): 38-40 %

  • Alumina(Al, 03): 45-50%

  • Silica (SiO): 10%

  • Ferric Oxide (Fe, 03): 5-10 %

The important compounds of high alumina cements are monocalcium aluminates, tricalcium pentaluminate, dicalcium silicate, and tetra calcium aluminoferrite.

Sorel Cement

Sorel cement is prepared by adding strong magnesium chloride to finely ground calcinated magnesia. This cement sets to hard mass within 3-4 hours. The rate of hardening of the cement further increases with the addition of 1.5% calcium chloride. Calcium chloride accelerates the hydration process of dicalcium silicate and tricalcium silicate, which provide strength to the cement. The advantage of sorel cement is its accelerated rate of setting, which is useful during cold weather. Sorel cement is used in...

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Products & Services
Specialty Cement, Concrete, and Mortar
Specialty cement, concrete and mortar contain specialized binders such as K silicate, calcium aluminate, sulfur, and oxysulfate or polymer resins. They cure or set through film drying (air setting), chemical reactions, thermoset bonds, hydraulic bonds, hot melting, and multiple component binder systems.
Hydraulic and Portland Cement
Hydraulic and Portland cement products have a calcium silicate binder. They are often used to build and repair concrete or masonry structures.
Aluminum Oxide and Alumina Ceramics
Aluminum oxide and alumina ceramics have excellent wear characteristics, chemical resistance, compressive strength, high-temperature properties, and dielectric strength. They are used widely because of their versatility and low cost. Their main drawback is its relatively poor thermal-shock resistance due to higher coefficients of thermal expansion and lower thermal conductivity (compared to other pure ceramic materials).
Ceramic Sheets and Boards
Ceramic sheets and boards are stock shapes available as solid plates, slabs, and substrates. The board or plate may consist of a ceramic fiberboard product, a dense sintered ceramic plate, or a precast cement bonded slab.

Topics of Interest

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