RECYCLED FINE POWDER, METHOD FOR RECOVERING THE SAME, CONCRETE COMPOSITION USING THE SAME, AND CLASSIFIER

摘要

PROBLEM TO BE SOLVED: To provide recycled fine powder that contains many components originated from cement hardened body and large amount of calcium hydroxide and is useful as an admixture material for concrete, and a concrete composition formable of a high-strength hardened body in which neutralization is controlled using the recycled fine powder.

SOLUTION: The recycled powder is a classified material of demolished concrete powder arising from demolished concrete structures, from which coarse aggregate and fine aggregate were recovered, and contains particles having 10 μm or less of accumulative 50% diameter and 20 μm or less of accumulative 90% diameter. Preferably, the recycled powder contains 4-15 mass% of calcium hydroxide.

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