Navoi State University of Mining and Technologies, Navoi, Uzbekistan

I. T. Mislibaev, Dean, Doctor of Engineering Sciences, Professor, mislibaev65@mail.ru
D. I. Tuichieva, Assistant

Almalyk Branch of Tashkent State Technical University named after Islam Karimov, Almalyk, Uzbekistan

Sh. M. Alimov, Senior Researcher

The paper deals with the studies into increasing patterns of strength and rheological properties of backfill mixtures including coal ash and marble production wastes, as well as with the substantiation of rational interaction of materials within self-hardening mixtures. In order to analyze the technology of backfill mixture preparation using coal ash, backfill composition was examined. When selecting a hardener composition, the main criteria are its manufacturability (strength, transportability) and economic efficiency (price of components of aggregate, transportation costs). Experience of backfilling shows that the strength of a backfill is directly proportional to the consumption of a binder. For lab-scale testing, samples of self-hardening backfill materials of 3 different compositions were selected. Then, the calculations determined the amount of components necessary for preparation of 1 m3 of mixture. The samples intended for preparation of monolithic selfhardening backfill mixtures were stored in a room at an air temperature of 20±5 ° C, being covered with a damp cloth adapted to the conditions of underground mining operations, excluding the possibility of moisture evaporation. For the research, mold-cube samples with a side of 10 cm were made using a press. The test to determine resistance to the preset uniaxial compression of the prepared self-hardening backfill mixtures was carried out on press IP-1A-1000 designed for testing of construction materials and for the use in research institutes. In order to ensure the reliability of the research results, five samples of each composition were prepared and tested, and their strength values were obtained.

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