Дворкін, Л. Й. та Марчук, В. В. та Dvorkin, L. Y. та Marchuk, V. V. (2022) ПОРИЗОВАНІ СУХІ СУМІШІ НА ОСНОВІ РЕАКЦІЙНО-ПОРОШКОВИХ БЕТОНІВ. Вісник Національного університету водного господарства та природокористування (1(97)). с. 74-85.

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Анотація

У статті показано можливість отримання поризованих та теплоізоляційних сумішей на основі реакційно-порошкових бетонів. Наведено результати експериментальних досліджень розчинів та сухих будівельних сумішей на основі реакційно-порошкових бетонів. Показано можливість отримання таких розчинів. Наведено і проаналізовано експериментально-статистичні моделі технологічних та фізико-механічних властивостей розчинових сумішей та розчинів, показано шляхи їх покращення.

Title in English

POROUS CONSTRUCTION MIXES ON THE BASIS OF REACTION-POWDER CONCRETE

English abstract

This paper presents the results of experimental studies of mortars based on dry mixes using reaction-powder concrete. For reaction-powder concrete RPС), the typical compressive strength is in the range from 100 to 200 MPa, which can be several times higher than the strength of conventional concrete. RPС, along with high strength, also has a high crack resistance, which is characterized by the ratio of compressive strength to flexural strength. Powdered concrete can serve not only as the main structural material in the construction of buildings and structures, but also as a semi-finished product for obtaining dry building mixes for various purposes. The RPС does not contain a large filler іnstead, fine powders are used, such as quartz sand, ground quartz with particle sizes from 0.045 to 0.6 mm, microsilica, fly ash, ground slag and others. The term "reaction-powder" reflects the fact that all dispersed components in the RPС during curing undergo chemical transformations. Fly-ash can be used as additional component for the preparation of mixtures for various purposes. Dry construction mixes (DCM) are becoming increasingly important in construction due to a number of advantages over commercial mortar mixes. In some cases, the operation of large plants for the production of commercial mortar mixtures becomes inefficient due to increased transport costs. The use of DCM helps to increase productivity and quality of work, reduce transportation and storage costs, reduce technological operations. The ability to control the basic properties of DCM by changing the content of various components creates a wide range of materials needed for the construction of structures and thus allows you to use them in all types of work. For development of compositions of dry mixes it is expedient to use the statistical models received by means of mathematical planning of experiments. Based on the obtained data, experimental and statistical models of physical and mechanical properties of fresh and hardened mortar has been built and analyzed. The article shows a solution to the optimization problem according to the criterion of the minimum cost of the composition mixture using computer software.

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