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Alumina Cement

Alumina Cement

Alumina cement was first successfully commercialized by AGC Ceramics in Japan, and is used as component of various products applied to refractories , construction materials, and building materials.

What is Alumina cement ?

Asahi Alumina Cement is an alumina cement product made using a high temperature fusion process that creates quality stability.
Alumina cement is an inorganic material that form a dense texture when it reacts with water. It is known for its refractoriness, rapid hardening, resistance to chemical attack . We can develop new composite materials by use of their various characteristics and combination with other inorganic or organic materials.
Therefore, Asahi Alumina Cement is used not only in refractory castables, but also in various applications. Asahi Alumina Cement is useful for both improving existing materials and for developing new materials.

Types of Asahi Alumina Cement

Asahi alumina cement are made from bauxite and limestone by a high temperature fusion process. There are two types of Asahi Alumina Cement: "Asahi Alumina Cement No.1" and "Asahi Fondu". The main element of both types is calcium aluminate.

Product name Element
AC-1 image
AC-1
Asahi Alumina Cement No. 1(AC-1) Al2O3:55%
Fineness blaine:4600cm2/g
Mineral:CA、C2AS、CT
AF-R image
AF-R
Asahi Fondu(AF-R) Al2O3>:42%
Fineness blaine:3500cm2/g
Mineral:CA、C4AF、C2AS、CT
  • Asahi Alumina Cement No. 1(AC-1) Age of material and Cold crushing strength
    Asahi Alumina Cement No. 1(AC-1)
    Age of material and Cold crushing strength
  • 5Specimen immersed for 2 years in 5% sodium sulfate agueous solution photo
    Specimen immersed for 2 years in 5%
    sodium sulfate agueous solution

Characteristics of Asahi Alumina Cement

Rapid hardening

Compared to high-early-strength or ordinary Portland cement, Asahi alumina cement harden rapidly. It strengthens enough even at low temperatures. When mixed with Portland cement or other additives, they cause quick setting according to their formulation. Therefore, they are used for urgent construction of heavy traffic roads, railways, bridges, etc.

Refractoriness

Asahi Alumina Cement is often used as a bonding material for refractory castables because it form ceramic bonds at high temperature and maintain its strength even after cooling. With the accurate selection of aggregates, it is possible to produce refractory castables capable of resisting a maximum temperature of 1600°C.

Resistance to chemical attack

Alumina cement is an inorganic material developed over a century ago in France as a cement having durability in sulfate. It resists sulfuric acid corrosion better than Portland cement, and it demonstrates high resistance to chemical corrosion. Therefore, it is useful in the construction of ground water pipes, water pipes, swage pipes, factory drains, coastal establishments, and factory chimneys.

Characteristics of Alumina cement

Reaction to water

  • Reaction with water form a dense texture.
  • When mixed with water, it begins to harden in a few hours.
  • When hardening, it fever much in a short time.
  • When in contact with water, calcium ion and aluminum ion release into the water.

Superior Characteristics compared to Portland cement

  • It has low pH.
  • It hardens rapidly.
  • It has high fluidity.
  • It can combine with more water.
  • It has high refractoriness.
  • It has high durability in sulfuric acid.
  • It is resistant to efflorescence.

Other

  • It strengthens enough even at cold places.
  • When mixed with Portland cement, it cause quick setting.
  • It is less reactant than hydraulic lime or alumina.
  • Time needed for setting differs by temperature.
  • It is useful both in improving existing materials and in developing new materials by combination with the other.

Technical information

Cement Fineness
blaine
Setting time Tapping
flow
24 hour cured at
20°C
(cm2/g) Initial (h:m) Final (h:m) (mm)  Bending
strength
(MPa)
Crushing
strength
(MPa)
Asahi Alumina Cement No.1 4600 ≦5:00 ≦6:00 280 6 50
Asahi Fondu(AF-R) 3500 ≦5:00 ≦6:00 190 5 30.0

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