Concrete is wet, stiff, or just right according to most individuals on site. What they are actually referring to is slump – a basic measure of the workability, or consistency, of fresh concrete.
What is a concrete slump?
Slump: The amount of concrete “slumps” or settles after being formed and the mold is removed. Wetter, more workable mixes have a higher slump. A lower slump is a stiffer mix that holds its shape better. For Concrete Cheltenham, visit https://www.monstermixconcrete.co.uk/concrete-cheltenham
It is not as though you have to perform a complete slump test on every little job to understand the principle that consistency affects placement, finish, and strength.
Why slump matters:
It can make placement more difficult.
Too stiff a mix makes it difficult to get into corners or around reinforcement. This can result in air gaps and weak points.
It affects the finish.
If the mix is too moist, water can bleed out and leave a more dusty, weak top layer. As it dries, this can also cause more shrinkage cracking.
Strength and Durability
Too much additional water can help with pouring, but it often reduces the final strength of the concrete. One of the leading performance drivers is the water-cement ratio.
Getting it right on site
Add water slowly and never flood the dough to ‘rescue’ a stiff mix.
The correct blend for the type of work that needs to be done (different ratios for foundations, slabs, and paths).
Opt for a plasticiser to improve workability instead of additional water.