Self consolidating concrtete


ACI’s Committee 237 – Self-Consolidating Concrete continues collaborative work with other ACI committees to ensure that all committee documents are in agreement with respect to the application of self-consolidating concrete.The committee also sponsors technical sessions on various aspects of self-consolidating concrete technology during ACI Conventions, and collaborates with other technical international organizations that are developing guidelines/state-of-the-art reports on self-consolidating concrete, including RILEM, fib and CSA.It has also found application in architectural concrete because of its ability to create smooth surfaces free of honeycombing when used with high-quality formwork.Applications of self-consolidating concrete also include columns and beams, pumped concrete, foundations, and other applications where a flowing concrete will be beneficial to concrete a concrete mix which has a low yield stress, high deformability, good segregation resistance (prevents separation of particles in the mix), and moderate viscosity (necessary to ensure uniform suspension of solid particles during transportation, placement (without external compaction), and thereafter until the concrete sets).

The flowability of SCC is measured in terms of spread when using a modified version of the slump test (ASTM C 143).

Two important properties specific to SCC in its plastic state are its flowability and stability.

The high flowability of SCC is generally attained by using high-range water-reducing (HRWR) admixtures and not by adding extra mixing water.

SCC looks very different from conventional concrete while mixing.

Concrete producers must “retrain their eyes” for this very fluid mixture as it turns corners and fills forms.

Admixtures that affect the viscosity of the mixture are especially helpful when the grading of available aggregate sources cannot be optimized for cohesive mixtures or with large source variations.

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