Why should continuous-grained stones be preferred when pumping concrete?

Because when the maximum particle size of stones is the same, the void ratio of a single particle size is larger than that of a continuous particle size, large voids must be filled with mortar. Under the same conditions, the surface area of ​​aggregates per cubic meter of concrete: single-grained stones are larger than continuous-grained stones, and the corresponding amount of cement required is also larger. And because the concrete made by using continuous-grained stones has better fluidity than using single-grained stones, it is convenient for pumping construction. Therefore, priority should be given to using continuous-grained stones. </p