Self-Consolidating Concrete (SCC)

Modern structural elements are often designed with congested networks of reinforcing steel, requiring the high-flow characteristics of Self-Consolidating Concrete (SCC) to prevent voids and honeycombing. The ASTM C1621 J-Ring test, together with the C1611 Slump-Flow test, determine the passing ability of SCC, defined as the ability of the concrete to flow under its own weight to completely fill all spaces within the formwork. The L-Box offers an alternate method of determining flow, and is currently in use in Europe and some DOT’s in the United States. An ASTM L-Box procedure is pending at the time of this writing.