CA 40 is a hydraulic binder, with an alumina content of approximately 40%.
The principal components of CA 40 are calcium aluminates which make it an ideal binder for refractory applications. Its high monocalcium aluminate content yields refractory concrete with excellent mechanical properties. Due to the iron oxide content of CA 40, it is unsuitable for refractory concretes where iron oxide may not be tolerated, for example in reducing atmospheres.
On the other hand, CA40 has a high iron content compared to aluminate cement CA50, which gives CAF40 excellent abrasion resistance, especially suitable for the preparation of high temperature abrasion-resistant castable.
After drying out, mortars and concretes made from CA 40 slowly emit their hydrate water without destroying the matrix. At high temperatures (> 1000 °C), ceramic bonding occurs between the high alumina cement parts and the refractory aggregates. These ceramic bonds make CA 40 an excellent binder in refractory concretes and other refractory mortars or gunning mixes.
The rheological properties of CA 40 are well adapted for all types of placing methods, particularly for casting and gunning. It is recommended for applications where rapid hardening and excellent performance are required.
CA 40 is produced and controlled within a quality management system that is certified according to ISO 9001.
Specification
|
Specification |
Usual range |
Specification limit |
|
Chemical Composition(%) |
||
|
Al2O3 |
37.0 - 41.0 |
> 37.0 |
|
CaO |
36.0 - 40.0 |
< 41.0 |
|
SiO2 |
< 6.0 |
|
|
Fe2O3 |
13.0 - 17.0 |
< 18.0 |
|
MgO |
- |
< 1.5 |
|
TiO2 |
- |
< 3.0 |
|
R2O |
< 0.5 |
|
|
S |
< 0.1 |
|
|
CL- |
< 0.06 |
|
|
Finess |
||
|
+45μm(%) |
<15 |
|
|
S(m2/kg) |
350-400 |
> 300 |
|
Setting Time(min) |
||
|
IS |
60-130 |
> 45 |
|
FS |
100-180 |
<240 |
|
Flexural Strength (MPa) |
||
|
6h |
> 4.0 |
|
|
1d |
> 5.0 |
|
|
3d |
> 6.0 |
|
|
Compressive Strength(MPa) |
||
|
6h |
> 30 |
|
|
1d |
50-55 |
> 50 |
|
3d |
55-65 |
> 55 |
|
Workability(Spread after 15 min) |
||
|
(%) |
>30 |
|
Testing and Experimental Methods
The chemical compositions of calcium aluminate cements have been determined according to the following standard: GB/T205-2008:methods for chemical analysis of aluminate cement.
The fineness of calcium aluminate cements has been determined according to the following standard: GB/T1345-2005:The test sieving methods for fineness of cement.
Setting time measurement according to GB/201-2015:Calcium aluminate cement.
The composition of motar:cement 450g ,ISO standard sand 450g,water demand is determined according to the following standard:GB/T1346-2011:The test method for water requirement of normal consistency.
The cement motar strength has been determined according to the following standard: GB/T 17671-1999:Method of testing cements-Determination of strength. The composition of motar:cement 450g ,ISO standard sand 1350g,W/C ratio is determined by the test of fluidity of cement motar.
The workability has been determined by measuring the flow properties using the ASTM C230 flow table. The test is carried out using a standard siliceous sand mortar.
Composition of mortar according to EN 14647: 1350g of sand, 500g of calcium aluminate cement, 200g of water
Test carried out with 25 shocks after 15 min retained in cone mould,d1 (diameter of base) =100mm.
% of flow = d2 (mm) - d1 (mm)
Additional Information
Principal mineralogical phase: CA
Secondary phases: C12A7, C2AS, C4AF
C=CaO, A=Al2O3, S= SiO2, F=Fe2O3
Bulk density: 1100 kg/m3
Specific gravity: 3.2 - 3.3 g/cm3
Pyrometric cone equivalent (on neat cement paste): 1270 - 1290 °C
Storage and Shelf Life：As with all hydraulic binders, CA 40 must be stored in dry conditions, off the ground. In this case, it will retain its properties for at least 6 months. In many instances, properties are retained for more than one year.
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