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我国目前正在修订《钢筋混凝土结构设计规范》和《钢筋混凝土工程施工及验收规范》。在修订过程中,对混凝土标号的定义提出了“双改”方案,即:(1)混凝土试件的标准尺寸改为边长为15厘米的立方体;(2)混凝土标号定义为强度总体分布平均值减1.645倍标准差,而TJ10—74中的标号定义是总体分布的平均值减一倍标准差。“双改”方案对混凝土的非破损检测工作无疑会产生影响,其中第(2)点不会影响换算曲线,这里暂不讨论。第(1)点将对换算曲线产生影响,需作适当处理,才能协调一致。在制定混凝土非破损检测换算曲线的过程中,混凝土的标准试块是按边长20厘米的立方体考虑的,而实际使用的试块是边长为
China is currently revising the “Code for Design of Reinforced Concrete Structures” and “Code for Construction and Acceptance of Reinforced Concrete Construction.” In the revision process, the definition of concrete markings proposed a “double change” scheme, namely: (1) the standard dimensions of concrete specimens were changed to cubes with a side length of 15 cm; (2) the concrete markings were defined as the overall strength The distribution average is reduced by 1.645 times the standard deviation, while the label definition in TJ 10-74 is the average of the population distribution minus the standard deviation. The “double change” program will undoubtedly have an impact on the non-destructive testing of concrete. Point (2) will not affect the conversion curve. This is not discussed here. Point (1) will have an impact on the conversion curve and must be properly handled before it can be coordinated. In the process of formulating the conversion curve for the non-destructive testing of concrete, the standard test block for concrete is considered in terms of cubes with a length of 20 cm on one side, and the actually used test block has side lengths of