Qt6-15 High Security And Intelligent With Reasonable Price New Technologies Concrete Hollow Cement Brick Making Machine

Qt6-15 High Security And Intelligent With Reasonable Price New Technologies Concrete Hollow Cement Brick Making Machine

After the selected brick raw materials are processed, they enter the molding workshop for molding.Blank forming method basically uses plastic extrusion molding in China.There are three methods for plastic extrusion. That is plastic extrusion molding,semi-hard plastic extrusion molding and hard plastic extrusion molding.

Qt6-15 High Security And Intelligent With Reasonable Price New Technologies Concrete Hollow Cement Brick Making Machine

This method has been widely used for many years in the fields of soil science and engineering geology.Although China's brick and tile industry has been using it for many years, it is only for soft and dispersed clay raw materials.For coal gangue, shale, etc., which rely on reducing particle size to obtain plasticity, there is a great deal of deviation in using this method.For example, the plasticity of raw materials such as coal gangue and shale depends on crushing to reduce the particle size to a certain degree, adding water to the particles after decomposing (aging), and it is changeable during processing.If the hard clayey shale or coal gangue rich in illite is ground to a sufficiently fine degree (such as cement fineness),the plasticity index may reach a pretty high level.And formed moisture content and drying shrinkage may be larger than common clay materials, which totally differ from common brick clay.

Qt6-15 High Security And Intelligent With Reasonable Price New Technologies Concrete Hollow Cement Brick Making Machine

This is still the result after revalidation according to the geotechnical test method,which fully demonstrates that the current geotechnical test method used in the brick and tile industry can’t correctly reflect the characteristics of raw materials such as coal gangue and shale during processing and forming.In order to further prove the fact that raw materials such as shale or coal gangue relys on reducing the particles size to obtain plasticity, the hard shale in a place near Shijiazhuang was crushed into two groups in the laboratory.One group all can pass 0.9 mm sieve; the other can all pass 0.5 mm sieve.However, the shale of the same mineral composition differs greatly in its plasticity index only due to its different grain sizes, one being 4.8% (0.9 mm) and the other being 8.9% (0.5 mm).In order to further verify this phenomenon, this two groups were blended together in different proportions to determine their plasticity index, drying line shrinkage rate and drying sensitivity index. The results are shown in the following table.

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