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How To Reduce The Content Of Machine Made Sandstone Powder

Last Update:2020-05-09 07:30:17

From the premise of desilting stage of machine-made sand production process to the stone crushing stage, it can effectively control the mud content in the finished sand and make full use of stone powder. Under the condition that the methylene blue value of the original machine-made sand meets the requirements of the specifications for building sand, it is feasible to relax the stone powder content from 5% to 16%, that is, the working performance of the concrete mixture and the requirements of the current concrete structure design specifications for the basic mechanical properties of the concrete.

According to the relationship between the modulus of elasticity of ordinary concrete and the cube compressive strength: £ C = 105 / (2.2 + 34.7 / / Ou), the modulus of elasticity corresponding to each stone powder content of concrete in this test can be calculated. When the stone powder content is more than 5%, the elastic modulus of concrete decreases with the increase of stone powder content, and the ratio of measured value to calculated value changes from 1.16 to 1.35. The results show that the self embedding effect provided by the coarse planting surface and the multi corner shape of the machine-made sand enhances the common stress and deformation ability among the components of the concrete, and helps to reduce the elastic deformation of the concrete. However, when the content of stone powder reaches a certain degree, more cement stone slurry weakens the overall structure of aggregate, increases the viscous flow and viscoelastic deformation of cement stone powder composite under stress, which will lead to the decrease of concrete elastic modulus.

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