Concrete, Cured Properly: What Cube Testing Tells You

Every Pour On A Well-Run Site Produces A Set Of Small Concrete Cubes. They Are Cured In Water And Crushed In A Laboratory At Seven And Twenty-Eight Days. The Number That Comes Back Is The Compressive Strength Of The Concrete That Is Now Holding Up Your House.

How To Read The Report

The Design Grade Is Written As M20, M25 And So On — The Number Is The Target Strength In Megapascals At Twenty-Eight Days. A Healthy Report Shows Results At Or Slightly Above The Grade, Consistently, Across Pours. A Single Low Result Is Investigated; A Pattern Of Them Is A Structural Conversation.

Curing Is Where It Is Won Or Lost

Concrete Gains Strength By Hydration, Not By Drying. Seven To Fourteen Days Of Genuine Wet Curing Is The Difference Between The Designed Strength And A Slab That Cracks Early. On A Site Where Curing Is Taken Seriously You Will See Ponded Slabs And Wet Hessian, Not Just A Hose Passing By.

Ask For The Reports By Pour, Not A Summary. They Exist, They Are Cheap To Produce, And Any Developer Who Ordered Them Will Be Glad To Show You.