Self-consolidating concrete flows like a thick liquid and levels itself without vibration while keeping its stone in suspension. It relies on HRWR for flow and often a viscosity-modifying admixture for stability, and it is checked with the slump flow test (ASTM C1611), where the spread commonly lands between 20 and 30 in, plus a visual stability index rating. Precast plants, congested columns and architectural walls use it to cut vibration and bugholes, but its form pressure approaches full liquid head.
It's SCC, so no stinger, just keep the hose low and let it walk itself across the form.
Calling it self-leveling concrete marks an outsider: self-leveling is the gypsum or cement underlayment poured over floors.
Also heard as
- self-consolidating concrete
- self-compacting concrete
Related terms
HRWR
High-range water reducer, the superplasticizer that makes concrete flow without adding water.
Consolidation
Working fresh concrete, usually by vibration, so it fills the form completely and releases trapped air.
Bugholes
Small surface pits on vertical formed concrete left by air bubbles trapped against the form face.
Slump
How far a cone-shaped sample of fresh concrete sags, the standard field measure of consistency.
Formwork
The temporary molds, supports and bracing that hold fresh concrete in shape until it can carry itself.