Aggregate is the largest raw material in the concrete system, and has always been considered to play a role in filling, skeleton, reducing the instability of the slurry, and improving the stability of concrete.

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Aggregates have abundant sources and are priced lower than cementitious materials, and have always been considered as fillers, leading many people to form the idea of “heavy cementitious materials, light aggregates”.

Under the guidance of this ideology, it is widely believed that as long as the quality of the adhesive material is well controlled, and even the quality of cement is well controlled, concrete can be well made.

However, the control of aggregate properties is neglected, resulting in significant fluctuations in concrete quality.

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