规定了立方体、矩形圆柱体和方形截面的矩形棱柱体形式的混凝土试样的标称尺寸和形状公差，以及它们各自的适用性。

Specifies the nominal dimensions and tolerances of shape of concrete test specimens in the form of cubes, rectangular cylinders and rectangular prisms with a square cross-section, as well as their respective applicability.