In the context of environmental protection requirements, the widespread use of coagulants in the production of mechanism sand has led to the prominent problem of residual coagulants in sand.
The residue of coagulants in sand is “destructive” to concrete: on the one hand, organic coagulants (such as polyacrylamide) compete with polycarboxylate superplasticizers for cement particle adsorption sites, leading to the “failure” of the superplasticizer; On the other hand, inorganic coagulants such as polyaluminum chloride can introduce chloride ions and sulfate ions, which can damage the durability of concrete.
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