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混凝土设计强度等级是怎么划分的？

混凝土设计强度等级是怎么划分的？

浏览：61次 | 提问时间： 07-10 08:39

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七瑾染年 07-10 08:40

混凝土强度等级的划分：混凝土的强度等级是指混凝土立方体抗压强度标准值(MPa)来确定的，符号是“C”表示。等级划分为：C7.5、C10、C15、C20、C25、C30、C35、C40、C45、C50、C55、C60共12等级。当然不同的工程或用于不同的部位混凝土，其对混凝土的强度等度要求也是不同的。 1、C7.5-C15主要用于垫层、基础、地坪及受力不大的结构。 2、C15-C25用于梁、板、柱、楼梯、屋架等普通钢筋混凝土结构。 3、C25-C30用于大跨度结构，耐久性要求较高的结构，与之构件等。 4、C30以上用于预应力钢筋混凝土构件，承受动荷结构及特种结构等现行国家标准《混凝土结构设计规范》(GB50010)规定，混凝土强度等级采用立方体抗压强度标准值确定，划分为：C15、C20……C80，共14个强度等级，级差为N/mm^2(Mpa)。其中C50~C80为高强混凝土范畴。标号的称谓是以前的叫法，也成为我们日常的叫法了，现在准确的叫法是“强度等级”。C是混凝土英文单词的第一个字母，后面数字表示混凝土的立方体抗压强度标准值为多少为5N/mm2(Mpa)。该数值时统计数据，具有95%的保证率。《混凝土结构设计规范》(GB50010)规定，钢筋混凝土构件的混凝土强度等级至少用C15。但作为基础垫层的混凝土，因为不是主要受力作用，其强度等级可以放宽一些，可以用C10。常用的有C10，C15，C20，C25，C30，C35，C40，C45，C50，C60

浅 07-10 08:48

混凝土设计强度等级按立方体抗压强度标准值确定，具体如下：
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，C40，C45，C50，C55，C60，C65，C70，C75和C80。
希望可以帮到你。

别靠近我有病 07-10 08:56

根据最新版的《混凝土结构设计规范》混凝土强度分为14个等级，它们是：C15，C20，C25，C30，C35，C40，C45，C50，C55，C60，C65，C70，C75，C80。
而以前规范规定混凝土强度分为12个等级，它们是：C7.5，C10，C15，C20，C25，C30，C35，C40，C45，C50，C55，C60。现在采用商品混凝土，C7.5和C10已经不拌制，这两个强度等级的混凝土用小型混凝土搅拌机搅拌，还是可以的，各位若有兴趣，找10年前的正规设计院图纸，垫层混凝土都是C10的。
此外现在普遍应用的预应力管桩多数是C80混凝土，它是蒸汽养护的。

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