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

### January 1, 2011

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.

suggestions and improvements are welcomed

cube have a four confined ends. so, cube take more load. but cylinder have no confined ends, so it is easy to failure

Good, worth seeing.

It’s very easy to find out any topic on web as compared to books, as I found this post at this web page.

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 %.