The present invention relates to a self-compacting additive composition for concrete, capable of improving resistance to material separation while securing high fluidity, and a low strength self-compacting concrete structure using the same. The self-compacting additive composition for concrete of the present invention comprises 30 to 80 parts by weight of a urethane associative thickener, 30 to 80 parts by weight of an acrylic associative thickener, 10 to 20 parts by weight of a moisturizer, and 10 to 30 parts by weight of hydroxyethyl cellulose, with respect to 100 parts by weight of a fluidity enhancer.
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