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过去,我国反映混凝土强度的指标习惯上采用以“标号”来表示。在国家标准《钢筋混凝土结构设计规范》T J 10—74(以下简称原规范)中规定了混凝土标号是指按标准方法制作和养护的边长为20cm的立方体试件,经28d龄期用标准试验方法测得的抗压强度。其强度保证率不低于85%。而在现行国家标准《混凝土结构设计规范》G B J 10—89(以下简称新规范)中重新规定了混凝土强度等级应按立方体抗压强度标准值确定。立方体抗压强度标准值是指按照际准方法制作养护的边长为15 cm的立方体试件在28 d龄期,用标准试验方法测得的具
In the past, China’s indicators reflecting the strength of concrete were customarily represented by “labels.” In the national standard “Code for Design of Reinforced Concrete Structures” TJ 10-74 (hereinafter referred to as the original specification), concrete markings refer to cube specimens with a side length of 20cm prepared and maintained according to the standard method, and used for a standard test of 28 days. The measured compressive strength of the method. Its strength guarantee rate is not less than 85%. In the current national standard “Specifications for Design of Concrete Structures” G B J 10-89 (hereinafter referred to as the new specification), it has been stipulated that the concrete strength grade should be determined according to the cube compressive strength standard value. The cube compressive strength standard value refers to a cube specimen with a side length of 15 cm made and maintained according to an interim method at a 28-day age, measured by a standard test method.