This work is devoted to development of optimum recipes of high-strength concretes based on filled binders with fine-milled anthropogenic mineral filler intended for earthquake resistant high-rise monolithic construction. The optimum recipes of concretes in this work have been developed on the basis of computations and experimental designing of cast concrete mixes with chemical additives and anthropogenic mineral fillers, as well as destructive inspection methods as the most precise for analysis of physicomechanical and deformation properties of concrete. The following raw materials have been used for production of high-strength concretes: natural quartz sands with the fineness modulus F.M. = 1.7-1.8; crushed limestone with the particles sizes of 5-20 mm; water reducing chemical additives and hardening retarder to control specifications of concrete mixes; plain Portland cement, grade PTs 500 D0; anthropogenic mineral additives (fillers) in the form of crushed concrete and ceramic bricks. Optimum recipes of monolithic concretes have been designed using anthropogenic raw materials including normal concrete grades with compressive strength of M30-M40 and high-strength concrete grades of M50-M80, characterized by high homogeneity of cement stone with significantly finer pores and lower shrinkage. Herewith, it has been established that fine-milled anthropogenic mineral filler in the form of crushed concrete and ceramic bricks at the ratio of 70:30, respectively, efficiently influences specifications of concrete mixes on their basis significantly increasing resistance of the mix against sedimentation and water gain. It has been established that the developed high-strength concretes based on filled binders with fine-milled anthropogenic mineral filler are characterized by high freeze–thaw resistance (from F400 to F600) and water tightness (W14 and higher), which is a solid base providing high lifecycle of such concretes.
The paper presents the study of the impact of technogenic mineral filler (TMF) on the basic properties of highquality concrete mixtures and concretes. There are principles of rational use of secondary technogenic raw materials in the form of concrete scrap, crushed bricks, ashes and slag mixtures in the technology of monolithic concrete. It is proved that the technogenic mineral filler, located between particles of a binder, significantly strengthens the cement stone by reducing the differential emptiness of the original water-cement paste in the direction of smaller pores and voids, which causes the formation of cement matrix with smaller capillary pores. , secondary raw materials, concrete scrap, crushed bricks, ashes and slag mixture, disposal, concrete mix, high-quality concrete, mineral filler, efficiency, water separation on concrete mix, density and increased Keywords-technogenic wasteAmong the nondestructive testing of concrete strength, the methods for complete destruction were used on hydraulic
The paper discusses the issues associated with the development of multi-component binders and high-quality concrete on their basis. The basis for the preparation of such binders is the use of finely divided mineral additives of natural and man-made origin. Particular attention is paid to the aggregate, the strength of coarse aggregate should be at least 20% higher than the strength of concrete, and the maximum particle size should not exceed 8-20 mm. To date, considerable experience has been gained in the production of multicomponent binders, and the results of the research carried out in this direction have shown that the raw material potential of the republic allows obtain high-quality concrete of class B 30-40. As if to expand the geography of natural resources regions of the North Caucasus Federal District, it is possible to obtain concrete of higher strength.
During burning of Portland cement clinker, a large amount of both clinker and aspiration dust accumulates in electrostatic precipitators and rotary kilns; therefore, rational use of these products containing a certain portion of a complete raw material is an important task in the cement industry. It is noted that reuse of dust from electrostatic precipitators through recycling in the kiln is impossible, since it contains a high amount of alkali-containing impurities, and this will have a negative effect on the clinker quality. Therefore, the paper presents a practicable method of utilization of cement kiln dust in production of alkaliactivated clinker-free binders and concrete based on these binders. The results obtained in the study of cement kiln dust are presented, and the energy dispersive and comparative analyses of the test powders are carried out. The results of chemical analysis are used to determine the relationship between oxides in the form of appropriate moduli and saturation factor. Recipes for alkaliactivated binders are developed, and their properties are studied.
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