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Culvert production: Sand compaction process
Workers shovel 20kg loads of damp sand (8% moisture content) into the 1.5m-diameter rotating drum at 15rpm. The centrifugal force creates 10cm-thick, 2m-long pipe sections with 85% compaction density. This manual-mechanical hybrid method produces 50 culverts/day (30MPa strength) using local materials, reducing costs by 60% compared to precast ...
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