When selecting coarse aggregate for concrete, the following points should be noted: (1) The flexural strength of concrete with continuous gradation of coarse aggregate is better than that of concrete with single particle gradation.
(2) The flexural strength of concrete with a maximum particle size of 25mm is better than that of concrete with a maximum particle size of 31.
5mm.
(3) The worst strength is the mixture of single particle size grading with a maximum particle size of 31.
5mm.