SCC
SCC turns up in 2 fields: corrosion, concrete. Here is what it means to the people in each one.
SCC in corrosion
Stress corrosion cracking: brittle cracking caused by tensile stress acting together with a specific corrosive environment.
Stress corrosion cracking: cracking of a normally ductile metal when a susceptible material, tensile stress (often residual weld stress) and a specific environment coincide. Classic pairs include austenitic stainless steel in hot chlorides, usually above about 60 C, buried carbon steel pipelines in carbonate-bicarbonate or near-neutral pH groundwater, brass in ammonia and carbon steel in hot caustic. Cracks are fine, branching and often invisible until a leak or rupture.
"Mag particle found a colony of SCC under the disbonded tape at about two o'clock on the pipe."
SCC in concrete
Self-consolidating concrete, a highly fluid mix that fills forms and wraps rebar under its own weight.
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."