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Refractory material-High Alumina Cement CA50-G5
High Alumina Cement CA50-G5

Aluminate cement is produced by preparing raw meal consisting of applicable bauxite and limestone,calcining the raw meal in rotary kiln and grinding the clinker, which contains Al2O3 50-59%. It was called bauxite cement for a time and also called "refractory cement" based on its main usage. The name "aluminate cement" is specified by the national standard now.

The main minerals in aluminate are monocalcium aluminate (CA), monocalcium dialuminate (CA2), "12:7" calcium aluminate (C12A7), gehlenite (C2AS), minor perovskite (CT) and dicalcium ferrite (C2F). Among these minerals, CA hydrates rapidly and sets normally with characters of rapid hardening and early strengthening; CA2 hydrates slowly and contributes to late strength. The compressive strength at 3d for the cement reaches about 90% of the maximum strength, thus in the national standard, the compressive and flexural strengths at 1d, 3d are specified to determine cement grades.

The aluminate cement can resist a high temperature at which a relative high strength still remains. Its refractoriness increases with the content of CA2. Therefore it is suitable to make refractory concrete as a binder. Depending on the refractory aggregates (firecaly,high alumina) used, the refractory concrete made of the cement can be used below 1400℃.
    If it is used in construction, attentions given in the appendix GB201 must be followed.

Product quality
Aluminate cement manufactured by sintered method in rotary kiln are according with up-to-date standard GB201-2000, which are graded as G5,G7. Other new products super-early-strength type CA50-N and high-strength type CA50-G9 are to be introduced in addition, whose quality standard are based on CA-50 of GB201-2000.
Chemical Composition
Item Unit CA-50 GB201-2000 CA50-G5
Al2O3 % ≥ 50, < 60 ≥ 50, < 60
SiO2 % ≤ 8.0 ≤ 8.0
Fe2O3 % ≤ 2.5 ≤ 2.5
R2O % ≤ 0.4 ≤ 0.4
S(total sulfur) % ≤ 0.1 -
Cl % ≤ 0.1 -

 

Physical Property
Physical Property Unit CA-50 GB201-2000 CA50-G5
Fineness(0.045mm residue) % <20 -
Blaine specific surface area m2/kg ≥300 ≥300
Setting time Initial min ≥30 ≥30
Final h ≤6:00 ≤6:00
Flexural strength 1d MPa ≥5.5 ≥6.0
3d ≥6.5 ≥7.0
Compression strength 1d MPa ≥40 ≥45
3d ≥50 ≥55
Note:*( )According with the regulation of GB201-2000. We should offer the report of S,Cl contents, residue and 6h strength when the customer requires or the buyer and seller have the related agreement.
Test method
Chemical Composition: According with GB/T205 (with the exception of sulfur and chlorin).
Blaine: According GB/T8074.
Fineness: According with GB/T1345 with screen of 0.045mm.
Setting time: According with the addenda A of GB/TGB201-2000.
Strength: According with the amendment prescribe of GB/T17671 and GB201-2000. 
Packing
Adopted specified by GB9774 cement packing sack, 25kg or 50kg in PE bag with a complex bag of woven plastic and kraft paper outside. Other kind of bags can be supplied according with the agreements of the buyer and the seller.
Note
Keep in dry conditions and prevent humidity during storage and transportation. Don’t mix with other variety of cements.
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