VICAL68 is a pure calcium aluminate binder for refractory monolithic working at high and middle temperatures, showing excellent hydration activity, hydration strength and drying strength.
As a hydraulic binder intentionally designed, VICAL68 contains relative higher hydratable mineral phase- CA. This helps VICAL68 has a quicker green strength development together with appropriate setting time. It is suitable for refractory castables with higher requirement on demouding time and strength.
VICAL68, a binder manufactured by the sintering process, contains only calcium aluminates. Its stable quality, ensured by serious online monitoring and control of its mineral phase, provides and guarantees successful site-installation performance and flexible formula design.
VICAL68 is ideal binder in many applications due to its special mineral composition (higher CA phase), outstanding curing and drying mechanical strength and excellent mid-temperature properties. Particularly, VICAL68 is recommended to be used in the formulation made by nature raw materials and containing fume silica.
VICAL68 has been widely employed in many refractory application fields:
- In iron and steel industry, it has be used in precasts and permanent line for tundish,steel ladle, reheating furnaces and EAF roofs etc.
- In cement industry, it can be applied in preheater, cooler, kiln hood and kiln outlet.
- In addition, it has been employed in incinerator furnaces of power plant, refuse burning and petro chemistry.
Specifications
The specification has an Acceptable Quality Level (AQL) of 2.5%, with the values evaluated according to the sampling standard ISO 3951.
The usual range represents the typical values of our products.
Chemical Composition
| Composition |
Usual range |
Specification |
| Al2O3 |
65.0 - 68.0 |
> 65 |
| CaO |
32.0 - 34.0 |
< 35 |
| SiO2 |
0.2 - 0.6 |
< 0.8 |
| Fe2O3 |
0.1 - 0.3 |
< 0.4 |
| MgO |
< 0.5 |
- |
| TiO2 |
< 0.4 |
- |
| SO3 |
< 0.3 |
- |
| Soluble K2O+Na20 |
< 0.4 |
|
Remark: Chemical composition is determined according to Standard GB/T21114 : ( Chemical analysis of refractory products by CRF-fused cast bead method )
Fineness
| |
Usual Range |
Specification |
| Blaine Specific Surface (cm2/g) |
4300- 5000 |
> 4200 |
| Reject at 90 µm (%) |
- |
< 5 |
Remark: Fineness determined according to standard EN 196-6, methods for the measurement of the fineness of cement.
Workability
The workability of VICAL68 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.
| |
Specification |
| Flow after 30min (%) |
>40 |
Sand mortar prepared according to standard EN 196-1 consisting of cement 450g, sand 1350g, water 225g (W/C = 0.5).Value of flow tested after 30 minutes with 25 shocks in a conical ASTM mould with d1 (diameter of base) = 100mm. % of flow = d2 (mm) -d1 (mm).
Setting Time:
| |
Usual Range |
Specification |
| Initial set (min) |
140-200 |
> 130 |
| Final set (min) |
150 - 230 |
< 250 |
Sand mortar prepared according to stand EN 196-1 consisting of cement 450g, sand 1350g, water 225g (W/C = 0.5).Setting time measured according to NF P15-431: Vicat apparatus standard EN 196-3, but using a 1000 g test weight, temperature at 20°C; samples cured at 20°C with a relative humidity above 90%.Final setting time measured in accordance with NF P 15-431, and determined when the Vicat needle no longer penetrates the mortar.
Mechanical Resistance:
| Compressive Strength (MPa) |
| Age |
Usual Range |
Specification |
| 6h |
30-40 |
>25 |
| 24h |
50-65 |
>40 |
· Sand mortar prepared in accordance with standard EN 196-1 consisting of cement 450g, sand 1350g, water 225g (W/C = 0.5).
· Test conditions in accordance with EN 196-1; test prisms 40*40*160 mm; temperature at 20°C; samples cured for 24 hours at a relative humidity above 90%.
Additional Information
This information given below is just for guidance:
Mineralogical Composition:
· Principal Phase: CA, CA2
· Secondary Phase: C12A7, aA
* C = CaO, A = Al2O3
Other Physical Characteristics:
· Pyrometric cone equivalent:1570- 1600°C
· Bulk Density: 0.9 g/cm3
· Density: 2.90 - 3.05 g/cm3
Storage and Shelf Life:
As with all hydraulic binders, VICAL68 must be stored in dry conditions, off the ground. In this case, it will retain its properties for at least 12 months. In many instances, experience has demonstrated that properties are retained for more than one year.
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