In low strength grade concrete, the amount of cementitious material used is small, and the amount of slurry is also small.
Increasing the particle size of the aggregate appropriately and reducing the specific surface area can reduce the amount of slurry used, increase the compactness of the concrete, and improve its strength.
But it’s not that the larger the particle size, the higher the concrete strength.
In high-strength concrete, the larger the particle size of the aggregate, the higher the probability of defects.
In concrete mixtures, the larger the particle size of the aggregate, the faster it sinks, resulting in poor uniformity and low strength of the concrete.
The use of small-sized aggregates in high-strength concrete can reduce aggregate defects, increase the bonding area between aggregates and cement slurry, and improve concrete strength.
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