Mechanochemistry Synthesis of Composite Binder From Industrial Wastes

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Title: Mechanochemistry Synthesis of Composite Binder From Industrial Wastes

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Publication: CIA

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Date: 2/13/2011

Abstract:
The Siberian State University of Industry (SSUI) in association with the Siberian branch of the Russian Academy of Sciences (SBRAS) has created a new composite binder consisting of high calcium fly ash from the Abakan thermal power plant, used molding sand mixture ("burnt" sand) from foundry, Abakanvagonmash, and waste product from the Yurga abrasion plant. Fly ash contains up to 40% SiO2 and 35% CaO including above 15% free CaO. The used sand mixture includes above 90% SiO2, mostly in the amorphous state. The waste product of the abrasion production (high alumina product) contains 80% and more Al2O3. Grinding ash, sand and high alumina product (HAP) together by means of mechanochemical activation in planetary ball mills to the fineness of 750 m2/kg and using heat treatment of the materials produced a binder with a compressive strength above 50 MPa at 28 days. The mixture proportions of the binder were as follows: 80% fly ash, 10% burnt sand and 10% HAP. As a result of this processing, above 60% free CaO interacts with the amorphous SiO2. The creation of the binder from industrial wastes gives both economic (its cost is 2 times lower that of portland cement) and ecological benefits, eliminating landfills and reducing CO2 discharge into the atmosphere (the production of a ton of cement discharges above 0.5 ton CO2).


Concrete Institute of Australia, International Partner Access.

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