混凝土工程中,砂、石都要求有一定的级配,特别是碎石,适当的级配可以增大混凝土流动度,降低水泥用量并提高混凝土强度。一般粒径为5～40mm,最大粒径可达80mm,这要视构件的具体截面而定。在大体积混凝土中加入一些毛石,可以少用一部分混凝土,它是混凝土工程中的 In concrete engineering, sand and stone all require a certain degree of gradation, especially gravel. Proper gradation can increase the fluidity of concrete, reduce the amount of cement and increase the strength of concrete. The general particle size is 5 to 40 mm, and the maximum particle size can reach 80 mm, depending on the specific section of the component. To add some rubble to the mass concrete, it is possible to use less concrete, which is in the concrete project.