Evaluation of Properties of Fuel Ashes as Components of Composite Materials

Composite materials combine heterogeneous components in their composition, varying the ratio of which it is possible to obtain materials with the required set of properties. These materials include cement asphalt concrete, which is a semi-rigid composite containing thermodynamically incompatible types of binders (bitumen and cement). Taking into account that the fuel ashes to varying degrees have a positive effect on the properties of both organic and inorganic binders of hydration hardening, it is necessary to determine the stage of introduction of fuel ashes into the raw material mixture when obtaining the final material by a separate and sequential method. In this regard, the paper presents the results of a study of the variability of physico-chemical and structural features of fuel ashes, studies their activity with respect to the most chemically active component of cement asphalt-Portland cement, as well as makes a comparative analysis of the effect of ashes on the change of structural-mechanical and visco-elastic properties of bitumen. High calcium ash of Nazarovskaya TPP and low-calcium ash of Troitskaya SDPS (state district power station) were subjected to the studies. As a result of the analysis of calculated indicators of the quality of ashes and empirical data of the activity index in relation to Portland cement, the dependence of changes in these parameters on the composition and structural features of fuel ashes is established. Comparative analysis of structural and mechanical and visco-elastic properties makes it possible to establish the feasibility of each of the types of ashes depending on the changes of the temperature interval of exploitation of bitumen.

A.Yu. MARKOV, Engineer-Researcher ((This email address is being protected from spambots. You need JavaScript enabled to view it.)
V.V. STROKOVA, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
I.Yu. MARKOVA, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Belgorod State Technological University named after V.G. Shukhov (46, Kostyukova Street, Belgorod, 308012, Russian Federation)

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