why compressive strength of concrete cube is more than that of cylinder?

Reasons for concrete cube to have greater compressive strength as compared to cylinder is

  • contact area of a standard cube mould with the upper platen in the testing machine is more which results in more confinement .
  • more confinement resist against specimen expansion resulting in more compressive strength

The ratio between cube strength and cylinder strength is commonly assumed to be 1.25 , but it is not constant.

6 thoughts on “why compressive strength of concrete cube is more than that of cylinder?

  1. Hi~
    I have a question want to discuss with you, that is :
    Are there any code/standard recommend the ratio of concrete compression strength between cube and cylinder ? such as 80% or 85 %.

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