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1. Selected materials without roughly
The amount of cement slurry should be sufficient; the particle size of the aggregate should be strictly screened. The maximum particle size of pebble should be less than 1/3 of the diameter of the delivery pipe, the maximum particle size of crushed stone should be less than 1/4 of the diameter of the delivery pipe, and the sand content should be greater than 40% The amount should be sufficient and kept above the stirring shaft. Pay attention to check the sl
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