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- W2349237544 abstract "Physico-chemical characteristics of Ultra-fine Fly Ash (UFA) collected by electro-static precipitators and airflow classing technology are investigated. It was observed that density, ignition loss, water absorption and Ratio of f_(cu,28d) of UFA increase with fineness, but ratio of water requirement decrease with fineness. Zeta potential of UFA in water is negative, and its absolute value increase with fineness .Only a little change in mineralogical composition of fly ashes was observed. Particle size distribution and particle morphologies of UFA were also studied. Results show that UFA has satisfactory water reducing and reinforcing role. The dense packing and micro-aggregate effect of UFA play an important role in improving early compressive strength, but 14 days later, the pozzolanic effect started to play a role in improvement of strength . A series of UFAproducts developed have good performance , meeting the requirements of Q/DBAA 001-2002.Those products were applied to railway prestressed reinforced concrete beams, road high performance concrete ,rapid hardening and early strength high performance concrete for pavement repair and mass concrete." @default.
- W2349237544 created "2016-06-24" @default.
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- W2349237544 date "2004-01-01" @default.
- W2349237544 modified "2023-09-22" @default.
- W2349237544 title "Development and application of composite ultra-fine fly ash and special concrete technology" @default.
- W2349237544 hasPublicationYear "2004" @default.
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