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# How to set the most reasonable proportion of the aggregate when make castable?

Aug 18, 2018

There is a great relationship between the fluidity of the unshaped castable and the proportion of the castable trace agent and the material selection, it’s not significant with the ratio of the aggregate. In general, the fluidity of the castable should be considered from the properties of itself first, which is divided into acid, neutral ,alkaline, weak acid, weak alkali and so on. It can greatly improved the fluidity of the castable if add a certain amount of silica fume reduce using amount of the cement and greatly increase strength of the castable, but we all know that most of the silica fume is used as industrial secondary product, because of the quality stablity is not good,it may affect the overall usability of the castable.

Jundao (Henan）New materials Co.,Ltd gave you a suggestion, a test is required for silica fume before using. Only need the detection index of viscosity of the slurry (R2O) and PH value.The viscosity of matrix slurry corresponds to the size of the viscosity of silica fume, the smaller the viscoscity of the matrix slurry, the larger the fluidity value of the castable. In the case of no additives, the flow value is very small when only the silica fume added, which means the slurry and additives should be used simultaneously when using, the fluidity will be perfect.

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