BINDING COMPOSITIONS FOR FINE-GRAINED CONCRETE IN PILE FOUNDATIONS

In modern construction, pile foundations are widely used due to their high bearing capacity, reliability, efficient operation on various soils, absence of settlement, uniform load distribution and high economic efficiency. To ensure the above properties, it is necessary to create fine-grained concrete on effective composite binders. The possibility of using man-made products is considered: waste from wet magnetic separation and quartzite sandstone in obtaining binder compositions in various grinding units: vibration and rotary ball mills. The initial characteristics and microstructures of raw materials are given. It was found that the binder composition of the composition: cement - 70% and waste from wet magnetic separation - 30%, prepared in a vibration mill, has a strength comparable to the strength of pure cement, which allows saving up to 30% of the clinker component of cement. It was revealed that the obtained binder composition of the following composition: cement - 50% and quartzite sandstone - 50%, prepared in a rotary ball mill, provides savings of up to 50% of Portland cement clinker and has a strength approaching the strength of pure cement, which ensures savings of Portland cement clinker up to 50%. The results indicate the features of obtaining binder compositions using waste from wet magnetic separation and quartzite sandstone in rotary ball and vibration mills. For further modification of the obtained binder compositions, it is advisable to use plasticizing additives. The use of waste from wet magnetic separation and quartzite sandstone will contribute to improving the environment and the ecological situation as a whole, and will also improve the quality of the finished product.