Influence of Mechanical Activation on Process of Formation and Properties of Composite Binding Materials

The possibility of increasing the quality of composite binders with the addition of magnesia-silicate rocks by means of mechanical activation of raw mixes is considered. It is established that the increase in the time of mechanical activation from one up to twenty minutes leads to the increase in the specific surface of the raw mix that promotes the increase in chemical activity of the surface layer and acceleration of solid-phase reactions with generation of silicates of diopside, monticellite, and mervinite types. The optimal time of mechanical activation (15 minutes), in which the hydrated system has the highest quantity of mixed hydro-silicates of calcium, magnesium and iron that leads to high physical-mechanical properties of binding compositions, has been determined. It is established that after 15 minute grinding of the raw mix the ultimate strength of binding compositions when bending, after 28 days of normal-humidity hardening, is equal to 20.2 MPa, under compression – to 66.7 MPa.

L.I. KHUDYAKOVA, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
O.V. VOILOSHNIKOV, Candidate of Sciences (Engineering)
I.Yu. KOTOVA, Candidate of Sciences (Chemistry)

Baikal Institute of Nature Use, Siberian Branch of the Russian Academy of Sciences (6, Sakhyanova Street, Republic of Buryatia, Ulan-Ude, 670047, Russian Federation)

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