Mix-design method of self-compacting concretes for pre-cast industry

Some mix-design methods for self-compacting concrete (SCC) have been proposed since the 1990s, but these methods do not address all practical needs. This paper proposes a method that enables the composition of SCC to be designed for a given strength (in this study, from 10 to 50 MPa at age 1 day or from 30 to 70 MPa at age 28 days). In this method, the compressive strength of SCC at an early age is considered an important parameter to answer the needs of the precast industry. The proposed mix-design method is based on optimizing the packing density of aggregates and ensuring the necessary quantity of paste to fill the voids between aggregates and to provide good fluidity of the SCC. The compressive strength of SCC can be estimated according to the Bolomey formula, and the quantity of superplasticizer can be determined by the proposed method.

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