Recycled aggregate freezing and thawing cycle pretreatment method
A recycled aggregate and freeze-thaw cycle technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of poor durability, limited application range, low strength, etc., and achieve high physical bonding strength , Reduce physical damage, high packing density
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Embodiment 1
[0028] Use a cone crusher to crush the waste concrete for the first time into coarse aggregate with a particle size of less than 100mm; use an electromagnetic separation device and a gravity separation device to remove impurities such as steel bars, wood chips, broken glass, and plastic in the waste concrete; The waste concrete with impurities removed is soaked in water for more than 4 hours to allow water to fully penetrate into the structure.
[0029] Put the soaked aggregate into the freeze-thaw cycle system for a certain number of freeze-thaw cycles, using the method of water freezing and water dissolution, the high temperature should be above (20±2)℃, and the low temperature (-20±2)℃ below, once Freeze-thaw is a cycle, and a cycle time is not less than 4h; it experiences 10 freeze-thaw cycles.
[0030] The second crushing is carried out in the cone crusher, and it is crushed into coarse aggregates with a particle size of 31.5mm or less; the aggregates that have undergone the s...
Embodiment 2
[0032] Use a cone crusher to crush the waste concrete for the first time to make coarse aggregate with a particle size of less than 100mm; use a conveyor belt to set up an artificial separation platform to remove impurities such as steel bars, wood chips, broken glass, and plastic in the waste concrete; The waste concrete with impurities is soaked in water for more than 4 hours to allow water to fully penetrate into the structure.
[0033] Put the soaked aggregate into the freeze-thaw cycle system for a certain number of freeze-thaw cycles, using air-freezing and water-dissolving methods, the high temperature should be above (20±2)℃, and the low temperature (-20±2)℃ below, once The freeze-thaw cycle is a cycle, and the cycle time is not less than 8h; after the freeze-thaw cycle reaches 10 times, it is crushed for the second time in a cone crusher, and crushed into coarse aggregate with a particle size of 31.5mm or less; The secondary crushed aggregate is poured into the drum ston...
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