强度标准值是立方抗压强度总体分布中的一个值，强度低于该值得百分率不超过5%，即有95%的保证率。混凝土的强度分为C7.5、C10、C15、C20、C25、C30、C35、C40、C45、C50、C55、C60等十二个等级。
混凝土配合比是指混凝土中各组成材料（水泥、水、砂、石）之间的比例关系。有两种表示方法：一种是以1立方米混凝土中各种材料用量，如水泥300千克，水180千克，砂690千克，石子1260千克；另一种是用单位质量的水泥与各种材料用量的比值及混凝土的水灰比来表示，例如前例可写成：C:S:G=1:2.3:4.2,W/C=0.6。
常用强度混凝土配比
| 强度等级 | 水泥（Kg） | 水（Kg） | 砂（Kg） | 石子（Kg） | 配合比 |
|---|---|---|---|---|---|
| C20 | 343 | 175 | 621 | 1261 | 1:0.51:1.81:3.68 |
| C25 | 398 | 175 | 566 | 1261 | 1:0.44:1.42:3.17 |
| C30 | 461 | 175 | 512 | 1252 | 1:0.38:1.11:2.72 |
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