Compressive strength classes for normal and heavy concrete | Compressive strength classes for lightweight concrete | ||||

Class | fck-cylind (N/mm | fck-cubic (N/mm | Class | fck-cylind (N/mm | fck-cubic (N/mm |

C 8/10 | 8 | 10 | LC 8/9 | 8 | 9 |

C 12/15 | 12 | 15 | LC 12/13 | 12 | 12 |

C 16/20 | 16 | 20 | LC 16/18 | 16 | 18 |

C 20/25 | 20 | 25 | LC 20/22 | 20 | 22 |

C 25/30 | 25 | 30 | LC 25/28 | 25 | 28 |

C 30/37 | 30 | 37 | LC 30/33 | 30 | 33 |

C 35/45 | 35 | 45 | LC 35/38 | 35 | 38 |

C 40/50 | 40 | 50 | LC 40/44 | 40 | 44 |

C 45/55 | 45 | 55 | LC 45/50 | 45 | 50 |

C 50/60 | 50 | 60 | LC 50/55 | 50 | 55 |

C 55/67 | 55 | 67 | LC 55/60 | 55 | 60 |

C 60/75 | 60 | 75 | LC 60/66 | 60 | 66 |

C 70/85 | 70 | 85 | LC 70/77 | 70 | 77 |

C 80/95 | 80 | 95 | LC 80/88 | 80 | 88 |

C 90/105 | 90 | 105 |
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C 100/115 | 100 | 115 |