One of the main disadvantages of sulfur concrete is the formation of a crack defect when cooled in metal molds. The proposed way of using sequential addition of components, temperature control at the entire mixing stage of the mixture is based on previous studies, which showed that the main factors determining the compressive strength of samples are both sulfur itself and its interaction with fine filler, as well as its strength properties. The work is devoted to determining the influence of technological factors and methods of preparing mineral components on the strength of sulfur-concrete samples. To prepare sulfur-concrete samples, ground industrial sulfur produced by Kaspiigaz LLC, natural zeolite of the Kempendyaysky field, and crushing waste from carbonate rocks of the Sasaabytsky field were used. For experimental studies, compositions were prepared with the following content: ground sulphur 30 wt. %, filled with fine zeolite powder in amount of 5 wt. % and limestone crushed stone screening – 65 wt. %, using three methods of preparing mineral components. For mixing, a developed forced mixer was used, which provided an upper load of raw materials and unloading of the finished sulfur-concrete mixture. The determination of the compressive strength of sulfur-concrete samples was carried out on an IP-1A-1000 test machine, structural studies of samples were carried out on a JEOL JSM-6480LV high-resolution scanning electron microscope. A scheme of a mixing installation is proposed, which made it possible to optimize the multivariable stages of preparing a mixture for making sulfur-concrete samples due to the special shape of the blades and their location on the rotating shaft, as well as uniform heating of the mixture, high-quality mixing of ingredients is ensured to obtain a homogeneous technological mixture, the properties of which are the same in any individual volume. A method has been selected that makes it possible to produce sulfur-concrete samples without defects and increase the compressive strength by 17 %.
Lira A. Nikolaeva – Candidate of Technical Sciences, senior researcher, Laboratory of Composite Building Materials, Federal Research Center "Yakut Scientific Center of Siberian Branch of the Russian Academy of Sciences", a Separate Division Institute of Oil and Gas Problems SB RAS, Yakutsk, Russia
Maria E. Savvinova – Candidate of Technical Sciences, senior researcher, Laboratory of Composite Building Materials, Federal Research Center "Yakut Scientific Center of Siberian Branch of the Russian Academy of Sciences", a Separate Division Institute of Oil and Gas Problems SB RAS, Yakutsk, Russia
Aitalina A. Andreeva – junior researcher, Laboratory of Composite Building Materials, Federal Research Center "Yakut Scientific Center of Siberian Branch of the Russian Academy of Sciences", a Separate Division Institute of Oil and Gas Problems SB RAS, Yakutsk, Russia
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