Aluminous Cement Vical 71

VICAL71 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 without any additives, VICAL71 shows outstanding compatibility and tolerance to dosage and types of additives and micropowders in the formulations, which provides flexibility during formula optimization. Therefore, it is recommended to be used in high technology refractories, such as low cement, ultra low cement and pure corundum systemAs a hydraulic binder without any additives, VICAL71 shows outstanding compatibility and tolerance to dosage and types of additives and micropowders in the formulations, which provides flexibility during formula optimization. Therefore, it is recommended to be used in high technology refractories, such as low cement, ultra low cement and pure corundum system

VICAL71, 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.

The rheological properties of VICAL71 are well adapted to various installation conditions, particularly for the conditions like casting, self-flowing, gunning and shotcreting.

The chemistry of VICAL71 is particularly suitable for conditions where high purity is essential, especially for strong reduction atmosphere including carbon monoxide or hydrogen.

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	68.7 - 70.5	> 68.5
CaO	28.5 - 30.5	< 31.0
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)	4200- 4700	> 4000
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 VICAL71 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)	190-240	> 150
Final set (min)	200 - 260	< 300

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	>35

·  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:1590- 1620°C
·    Bulk Density:  0.9 g/cm3
·    Density:         2.90 - 3.05 g/cm3

Storage and Shelf Life:
As with all hydraulic binders, VICAL71 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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