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Help CenterHigh Alumina Castable Refractory, Castable, Superplasticizer
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Cement mixed alumina-magnesia castables with 0.5%silica fume
1. Ingredient
Sintered corundum grain: 76%
White fused alumina and α-Al2O3 : 9%
97 silica fume: 0.5%
97 sintered magnesia: 200mesh 3%
“RS” brand: Calcium Aluminate Cement: CA70: 4.5%
“RS” brand: activated aluminium oxide RA05: 6.7%
“RS” brand: super plasticizer RC01: 0.3%
2.Operation
The above ingredients are dry mixing, after one minute, adding 4.5% water to stir them 3 minutes, the environment temperature is 25℃.
3.Inspection
Construction time: >40 minutes
110℃ X 12 hours
Bending strength: >12Mpa compressive strength: 96.9Mpa
Volume density: 3.14g/cm3 shrinkage: --%
1000℃X2hours
Bending strength: >12Mpa compressive strength: 89.4Mpa
Volume density: 3.08g/cm3 permanent line change: --%
Notice:
1. If adding other 0.2–0.3% silica fume, it can lower water demand and improve the strength in drying, medium temperature;
2. After testing, we think grain composition of this sample which needs optimization and upgrade.
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