What is mean concrete class c35/20. Here C35 and 20 means?
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Answer Posted / ross hampton
this is a old description (in UK and europeon standard terms). C35 is the cube crushing strength and 20 is the aggregate size. Strength wise now this would be called C28/35. 28 being the cylinder crushing strength and 35 the cube. The aggregate and constituent materials that make up the concrete will be different though.
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