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GB/T50107-2010,3.基本规定 3.0.1混凝土强度等级应按立方体抗压强度标准值划分......。 3.0.2立方体抗压强度标准值系指对按标准方法制作和养护的边长为150mm的立方体试件,在28d龄期,用标准试验方法测得的抗压强度总体分布中的一个值,强度低于该值的百分率不超过5%。GB50010-2010《混凝土结构设计规范》规定的混凝土强度等级有C15、C20、C25、C30、C35、*0、*5、C50、C55、C60、C65、C70、C75、C80共14个等级。:混凝土标号是指按标准方法制作、养护的边长为20 cm 的立方体标准试件,在28 d 龄期用标准试验方法所测得的抗压极限强度,以kgf/ cm2 计。如500 号混凝土,其试件抗压极限强度为500 kgf/ cm2 。混凝土的标号通常采用150、200、250、300、350、400、450、500、550、600。《铁路混凝土及砌石工程施工规范》(TBJ210 86) (此标准于1997 年7 月1 日废止) 和《铁路桥涵设计规范》(TBJ2 85) (此标准于2000 年2月1 日废止) 均作如此规定。 强度等级:混凝土的强度等级按立方体试件抗压强度标准值划分。立方体试件抗压强度标准值则是指按标准方法制作、养护的边长为150 mm的立方体标准试件,在28 d 龄期用标准试验方法所测得的抗压强度总体分布中的一个值,强度低于该值的百分率不得超过5 % ,亦即保证率为95 %。混凝土的强度等级通常采用C15、C20、C25、C30、C35、*0、*5、C50、C55、C60。强度等级为C60 及其以上的混凝土属高强混凝土。 标号与强度等级:两者主要差别在两个方面,一是所用标准试件尺寸不同,标号和强度等级所用立方体试件边长分别是 200 mm和150 mm;二是取值方法的不同,强度等级有明确的统计概念,即强度标准值是强度总体分布中的平均值减去1. 645 倍标准差(从而使保证率为95 %) ,而标号则没有明确的数理统计概念,据推算其保证率约在85 %的水平上。考虑标准试件尺寸的变化和强度等级的数理统计定义。两者的换算关系在89年《混凝土结构设计规范》(TJ10-89)的附录一中有说明,它们的对应关系是: 标号-强度等级 100-C8; 150-C13; 200-C18; 250-C23; 300-C28; 400-C38; 500-*8; 600-C58; 两种标准换算后的混凝土强度设计值,可以在89“规范”的表2.1.3中用线性插入法求得。当然是混凝土的标号或强度等级越高,强度越大了。
混凝土强度等级按立方体抗压强度标准值确定。立方体抗压强度标准值 系指按照标准方法制作养护的边长为150mm的立方体试件,在28d龄期用标准试验方法测得的具有95%保证率的抗压强度。目前,混凝土结构设计规范规定的强度等级从C15~C80,依次为:C15,C20,C25,C30,C35,*0,*5,C50,C55,C60,C65,C70,C75,C80
混凝土设计强度等级是怎么划分:GB/T50107-2010,3.基本规定 3.0.1混凝土强度等级应按立方体抗压强度标准值划分......。 3.0.2立方体抗压强度标准值系指对按标准方法制作和养护的边长为150mm的立方体试件,在28d龄期,用标准试验方法测得的抗压强度总体分布中的一个值,强度低于该值的百分率不超过5%。 GB50010-2010《混凝土结构设计规范》规定的混凝土强度等级有C15、C20、C25、C30、C35、*0、*5、C50、C55、C60、C65、C70、C75、C80共14个等级。