关键词: 混凝土强度等级, 混凝土标号

Abstract: The concrete grade of strength in the present design code for concrete structures is a basic representative quantity for the various strengths of concrete used for design. It is also a criterion to evaluate the quality of concrete in the construction. Now the present code has got considerable changes in concrete grade of strength. In order to understand and put the present code into practice correctly, this paper has stated this variation by contracting the present with the former code and deduced the conversion relationship between the concrete grade of strength and the concrete mark of the former code, which is very useful for practical engineering.

Key words: concrete grade of strength, concrete mark of the former code