Structure and Properties of Lime-Ash Cement and its Modification

The justification of energy efficiency of the combined method for obtaining lime-ash hydraulic binder through co-firing limestone and fly ash from thermal power plants is presented. The results of calculating the theoretical consumption of conventional fuel for firing a two-component carbonate-ash charge indicate a significant reduction in energy costs. The resulting lime-ash cement belongs to the group of low-grade binders, which limits the scope of its application. The influence of a number of additives and technological factors on improving the strength characteristics of a binder under the various conditions of hardening has been studied experimentally. Quantitative dependences of factors influencing on the final strength were established. The properties of lime-ash cement modified by the addition of Portland cement introduced during co-grinding and by adding to the mortar mixture were studied. The results of investigations of the microstructure of cement stone and the phase composition of cement powder are presented. As a result of improving the structural and phase characteristics of cement stone, it is possible to obtain a modified medium-quality hydraulic binder based on lime-ash cement, which significantly expands its application.

A.N. RIAZANOV¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
V.I. VINNICHENKO², Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
I.V. NEDOSEKO¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
V.A. RIAZANOVA¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
A.A. RIAZANOV¹, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.) 

¹ Ufa State Petroleum Technological University (1, Kosmonavtov Street, 450062, Ufa, Republic of Bashkortostan, Russian Federation) 
² Kharkiv National University of Civil Engineering and Architecture (40, Sumy Stкууе, 61002, Kharkiv, Ukraine)

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