Mechanized sand has been widely used in highway engineering concrete and has become an important source of fine aggregate.
However, problems such as high stone powder content and poor particle size distribution often lead to excessive viscosity of concrete mixtures, thereby affecting construction performance.
To improve the fluidity of concrete mixtures, it is often necessary to add polycarboxylate superplasticizer for adjustment.
However, polycarboxylate superplasticizer exhibits high sensitivity in mechanism sand concrete.
If its dosage is increased to improve the flowability of concrete, it often leads to bleeding, segregation, and delamination, which have adverse effects on its construction performance, mechanical properties, durability, and volume stability.
Therefore, on the basis of ensuring that polycarboxylate water reducers have good water reducing and dispersing effects, improving the state of concrete mixtures, reducing segregation and bleeding by compounding other functional components has become an important research direction to enhance the engineering applicability of polycarboxylate water reducers.
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