DEVELOPMENT OF MAIN PARAMETERS OF TECHNOLOGY OF FINE-GRAIN CONCRETE ON CAST IRON FILLERS

Abstract

The use of the proposed methods of regulating the composition and technology of fine-grained concrete (change in the phase composition of the binder towards the formation of highly basic hydrosulfoferites and sulfoalumoferrites of calcium due to the introduction of microsilica, iron oxide, metallic iron, the use of aggregates obtaining high quality stone. It is advisable to create composites with a minimum anisotropy value of their properties, which in the developed materials is regulated by the dispersion of the aggregate and the degree of expansion of the cement. This confirms the prospects of using the proposed fine-grained concrete as radiation-protective materials. The technology of obtaining radiation-protective fine-grained concrete on cast iron aggregates is proposed. It was found that the mixing of such mixtures must be increased over time by 33% to achieve homogeneity of the mixture with conventional compositions on Portland cement, so the duration of mixing mixtures on heavy aggregates will be 4-5 minutes, which requires the use of concrete mixers electric motor. The thickness of the laid layer, depending on V/C for concrete on cast iron dust should not exceed 30 cm, and for materials on cast iron shot is 20-25 cm. It is established that the optimal frequency of their vibration compaction is in the range f = 130-140 Hz, while for hard mixtures the compaction time is reduced by 75-85% compared to the standard frequency of 50 Hz. The optimal amplitude of vibration compaction for these fine-grained mixtures A = 0.15-0.4 mm.